جستجوی مقالات مرتبط با کلیدواژه "fruit" در نشریات گروه "کشاورزی"

Global warming and recent droughts are one of the main factors in reducing agricultural products. This research was conducted in order to increase the adaptability of ‘Asgari’ grapevine against drought stress in rainfed conditions. In this research, foliar spraying with kaolin (6%) and potassium sources (1.5% and 3% each of potassium nitrate, potassium sulfate and potassium chloride) was done during two seasons on 30-year-old vines located in Shiraz. Kaolin is a highly durable antiperspirant for vineyards, and it is a realistic and attractive strategy to protect grape clusters from excessive heat and sunburn. The results showed that the application of different sources of potassium caused an increase in berry weight, fruit cluster length, soluble solids, chlorophyll, leaf and fruit potassium content, relative leaf water content, and a decrease in the activity of antioxidant enzymes and leaf temperature compared to the control treatment. On the contrary, kaolin treatment decreased these traits and increased the activity of antioxidant enzymes compared to the control treatment. Potassium sources in both concentrations were able to improve the morphological and physiological characteristics of the, resulting in the greater resistance of ‘Asgari grapevine’ to drought and increase in yield compared to the control treatment. But the application of kaolin had no positive effect on studied traits, which may have been due to the inappropriate concentration used in this study.

Olive (Olea europaea L.) is the most famous species of Oleaceae family that has edible fruits. The olive tree has a tendency to alternate bearing, leading often to the production of massive fruit yield in one year (on) and a very low fruit yield in the next year (off). Knowing the changes of nutrients in different stages of olive fruit growth and development in the “on” and “off” years provides the possibility of timely and correct application of fertilizers. This research was conducted in order to investigate the changes in the concentration of mineral elements, starch, and protein of olive fruit in the on and off-years.

This research was carried out in the years 2018-2019 at Olive Dalaho Research Station in 2018 and 2019 at Dalahu Olive Research Station in Kermanshah (Lat. 32° 30´ N, Long. 45° 51´, Alt. 560 m.), west of Iran. The experiment was carried out in the form of a randomized complete block design with three replications and three local olive varieties, namely Deira, Zagros and Meshkat. All tested 11-year-old trees were under similar conditions in terms of pruning, drip irrigation, fertilization and pest and disease control. Measurement were carried out on N, P, K, Zn, B, starch, and protein in young leaves, fruits, old leaves, and roots from the time of kernel hardening (in early June) until fruit ripening (in mid-November) every 40 days using both "on" and "off" year trees. The samples included 20 broad leaves from the middle part of one-year-old and newly-formed vegetative branches, the growing fruits of the current year, and the feeding roots of 30 cm depth under the canopy of the tree crown. Measurements on potassium concentration were made by a flame photometer (model PFP7 made by JENWAY, England), phosphorus by colorimetric method using spectrophotometer, nitrogen and protein by Kjeldahl method, boron and zinc elements using an atomic absorption device (Perking Elmer model 31/40). Starch concentration of the dry matter was measured by Morley's method.

Monthly changes of mineral elements in leaves and young fruits, starch, and protein concentration in old leaves and roots were significant in the on and off years. The monthly changes in the concentration of the mineral elements corresponded to the pattern of the fruit growth curve (double sigmoid). The concentration of N, K, B, and Zn in young leaves decreased from the beginning of June to the middle of July (the time of endocarp hardening) and then increased slightly. The monthly changes in concentration of mineral elements in leaves and young fruits, starch, and protein in old leaves and roots were significant in the on and off years. The monthly changes of the mineral elements corresponded to the pattern of the fruit growth curve (double sigmoid). The concentration of N, K, B and Zn in young leaves decreased from the beginning of June to the middle of July (the time of endocarp hardening) and then increased slightly. Mashkat cultivar had the highest and Deira and Zagros cultivars had the lowest concentration of nitrogen in young leaves. The concentration of nitrogen has a direct effect on vegetative growth, fruit formation, fruit yield, and shoot growth. There was a positive and significant relationship between fruit nitrogen and phosphorus and zinc concentration of the fruit, but young leaf nitrogen had a negative and significant correlation with phosphorus and zincof the fruit. Deira cultivar had the highest and Meshkat the lowest zinc concentration of the young leaves. Zinc plays a significant role in the function of enzymatic systems, synthesis of nucleic acids, protein and auxin metabolism. There was a positive correlation between phosphorus concentration in young leaves with phosphorus concentration in fruit and leaf starch, but there was a negative correlation with leaf and root protein concentration. The concentration of starch in the old leaves and roots increased and then decreased in the on-year until June. The concentration of root starch decreased slowly from June to November in off-year trees. The concentration of protein in old leaves and roots followed a double sigmoid curve, it decreased sharply until mid-July. From the mid-July to the end of August, the protein concentration of the old leaves slowly and strongly in old leaves and roots, respectively.

Considering the observed changes in the concentration of mineral elements in the leaves and fruits according to the fruit growth pattern, especially in the spring, soil application of nitrogen, phosphorus, and potassium in January (before flowering), foliar spraying of nitrogen, potassium, zinc, and boron in June (after fruit set) and nitrogen and potassium amendments in August (after endocarp hardening) is recommended for the olive orchards of the studied region.

After potato, watermelon is the most important vegetable that cultivated in Iran. Irrigation is necessary for watermelon cultivation due to its high growth rate, short growth period and high fruit water content (90-92%). In addition high evaporation during growth and development stages and low rainfall in arid and semi-arid area caused that cultivation of watermelon need a lot of water. To minimize drought stress effect on yield of agricultural crop in arid and semi-arid areas, cultivation of drought tolerant cultivars, deficit irrigation practice and grafting of high yielding cultivars onto tolerant rootstocks are recommended. No paper has been published about grafting and deficit irrigation for watermelon cultivation in Khuzestan province yet, therefore present research was conducted to study the effects of these factors on yield, yield components and water use efficiency of grafted watermelon (B32 cultivar) onto pumpkin ‘Cubalt and Ferro’ (Cucurbita maxima × Cucurbita moschata.) and deficit irrigation in nongrafted watermelon.

This study was carried out at Behbehan Agriculture Research Station from 2020 to 2021. The experiment was done as strip plot in randomized complete block design with nine treatments and three replications. Three irrigation regimes, full irrigation, 80% and 60% of full irrigation were considered as vertical strips. Horizontal strips included B32 cultivar grafted onto pumpkin ‘Cobult and Ferro’ rootstocks (Cucurbita maxima × Cucurbita moschata.) and nongrafted B32. Watermelon and pumpkin seeds were planted in greenhouse in 5 and 10 January respectively and watermelon seedlings were grafted onto pumpk in 4 February. Seedlings were transplanted in 24 Feb. and fruits harvested from early to mid-June. Results were analyzed by MSTATC statistical software and comparison of meanes were done using Duncan,s Multiple Range Test at 1% probability level.

Yield, mean fruit weight and water use efficiency in grafted plants were significantly higher than nongrafted plants. Yield and mean fruit weight decreased significantly due to deficit irrigation. The most yield in grafted and nongrafted plants were obtained in full irrigation. The decrease of yield in nongrafted plants applied 80% of full irrigation as compared with full irrigation was not significant. In full irrigation regime the mean yield of grafted plants were significantly higher (50%) than nongrafted plants. The yield of grafted plants applied 80% of full irrigation were higher than nongrafted plants applied full irrigation , however this difference was not significant. Water use efficiency of grafted plants was significantly higher as compared with nongrafted plants. The differences of water use efficiency in grafted plants onto Cobult and Ferro rootstocks applied full irrigation, 80 % and 60% of full irrigation were not significant. In nongrafted plants the most water use efficiency belong to applied 80% of full irrigation. The decrease of water use efficiency in plants applied full irrigation was not significant as compared with this treatment. However the decrease of water use efficiency in plants applied 60% of full irrigation was significant in comparison to plants applied 80% of full irrigation.

grafting of B32 cultivar onto Cobult and Ferro rootstocks and applied full irrigation and 80% of full irrigation were recommended in no water restriction and water shortage conditions respectively for the maximum watermelon production in Khuzestan province.

The purpose of this research is to investigate the quantitative and qualitative characteristics of the Quercus branti stands in the altitude classes and to estimate the amount of its fruit production in the investigated stands; therefore, in the three altitudes classes of Sardasht forests (below 1400 m, 1000-1400 m, and over 1400 m), the study area were chosen and 27 transects were randomly taken. In the sample, characteristics such as species, height, dbh, small and large crown diameter, trees origin, health and distance between trees were measured. To estimate the fruit, the number of fruits produced from 116 stems in different diameter classes were visually counted and weighed. Based on the average weight of 100 fruits, the weight of all individuals was calculated. The results also showed that Quercus branti coverage was the highest in the altitude layer less than 1000 m and it decreases with the increasing altitude. The average d.b.h (36.16 cm), the crown diameter (6.34 m), and the total height (6.71 m) are the highest in the altitude class below 1000 m. D.b.h as an important variable showed a significant positive correlation with the amount of fruit produced by selected trees. This research showed that with the increase in altitude, the presence of the Quercus branti decreases, and the quantitative and qualitative characteristics of trees show significant differences. Based on the results, it is suggested to use more Quercus brantii species in rehabilitation and enrichment programs in the altitude class of less than 1000 meters.

One of the most effective ways to preserve biodiversity is to convert conventional systems into organic ones. The organic farming system reduces the negative effects of intensive management. The biomass of the soil ecosystem has different responses in management methods including tillage, fertilizer and defense inputs, and organic modifiers. Understanding the role and responses of biomass in different cropping systems is essential to support sustainable horticultural practices in managing plant-parasitic nematode.

Sampling has been done from two organic farming systems, conventional and pasture, in order to identify the morphology of soil plant parasitic nematodes, soil physicochemical characteristics, and microbial respiration. Plant parasitic nematodes were extracted, killed, fixed, and transferred to glycerin and permanent slides were prepared. The effect of the type of cultivation system on the abundance and diversity of plant parasitic nematodes in common and organic apple and peach orchards compared to pasture were investigated by multivariate analysis of variance (MANOVA) in Xlastat 2020 software.

20 Genera belonging to 11 families of plant-parasitic nematodes were identified, which had different frequencies based on the type of cropping systems and crops. The comparison of the type of organic cultivation system with the common showed that it had a significant effect on the frequency and diversity of plant parasitic nematodes; the highest frequency of the nematode genus in organic peach cultivation system is Gracilacus and the lowest frequency is Scutylenchus genus in common apple cultivation. The abundance of nematode family in organic system is more than common and the abundance of nematode family in peach organic system is more than apple organic system. It should be mentioned that the common apple system is close to pasture in terms of abundance. The abundance of nematode family in the common system of peach is more than the common system of apple. The type of cultivation system had a significant effect on the frequency and diversity of Pratylenchus, Helicotylenchus, Tylenchus, and Rotylenchus genera, while it did not have a significant effect on the  Gracilacus genus. Type of host plant had a significant effect on the frequency and diversity of plant parasitic nematodes definitely in all soil condition variables. The type of host plant was significant on the frequency of all plant nematodes except Tylenchus and a significant effect on the diversity of all except Tylenchus and Rotylenchus. Among all soil factors, microbial respiration, EC, OC, K, P, and texture (percentage of soil particles including sand, silt, and clay) showed a significant effect on all lineages of nematodes.

Significant differences in community structure in plant parasitic nematode communities in three systems were recorded. The results of the present study have shown that the frequency and diversity nematodes are different from the results of other researchers in apple and peach orchards, that plant types and cultivars, basic genotype, or soil management practices affect the composition of plant parasitic nematode community groups. In this study, the abundance and diversity of nematode in the organic system was more than in pasture, and conventional agriculture with more than 10 years of history, including tillage and chemical inputs, and organic matter loss, erosion, and low in the soil agroecosystem. The reduction of the plant parasitic nematode in the conventional system compared to the organic system is caused by the reduction of organic matter, tillage, or chemical inputs. The results showed that the type of product and management practices affect nematode communities. The composition of soil nematode communities is significantly different in organic, conventional, and pasture farming systems. The organic peach and apple system is facing an increase in nematodes more than conventional. It seems that plant parasitic nematodes are sensitive to soil management practices. Soil nematodes are useful indicators to evaluate the intensity of management and sustainable management of horticultural ecosystems on soil ecosystem performance; because they have several feeding habits in soil, and micronutrient networks and play an important role in the food cycle, pest suppression, and regulation of microbial communities. There were high pest pressure of nematodes in the organic peach farming system in comparison to the apple farming system. In this research, apple is better than the peach for organic production in Damavand orchards. In addition, growers consider peaches better than apples due to market and price considerations. With the increase in the demand and price of organic products, the organic system is facing high pest pressure due to fewer management options compared to the conventional system, which requires the development of integrated plant nematode management strategies.

Pumpkin (Cucurbita pepo) is a medicinal plant belonging to the Cucurbitaceae family and the order Cucurbitals. The seeds of this plant are a rich source of essential oils and proteins for the body. It is used in the production of various drugs such as Peponen, Pepostrin, Grunfig and treatment of prostate swelling, urinary tract inflammation, atherosclerosis, gastrointestinal regulation, etc. Since the components of medicinal plants are low at natural condition, and could be increased by means of different environmental conditions, nutrition or application of elicitors; thus, it is necessary to work on mentioned parameters effects on quantitative and qualitative attributes of medicinal plants. Recent years, many researches have been done based on natural components for increment of yield and secondary metabolites of medicinal plants. Ascorbic acid is one of these materials which its effect on plant growth has been validated. In the management of agricultural inputs, especially in the cultivation of medicinal plants, the application of substances that have the least harmful side effects on human health and the environment is recommended. Meanwhile, sucrose and ascorbic acid are healthy substances to improve growth and increase crop yield. Therefore, the aim of the present study was to determine the effect of these two substances on yield, yield components and phytochemical characteristics of pumpkins.
 Pumpkin seeds were prepared from Pakan Bazr Esfahan by purity of 99%. Then, planted in a farm of 500 m2 at Behshar. After plant growth, spray treatments were conducted at three times as before flowering, onset of flowering and fruit set stages. This experiment was conducted in factorial with sucrose factor at four levels (0, 5, 10, 15 g.l-1) and ascorbic acid factor at four levels (0, 15, 30, 45 mM), based on a randomized complete block design with three replications. The studied characteristics included number of leaves and fruits, plant yield, 1000-seed weight, total number of seeds, number of healthy seeds, percentage of healthy seeds, number of blank (deaf) seeds, percentage of blank seeds, total chlorophyll, antioxidant activity, phenol, flavonoids, protein and oil percentage. Statistical analysis of data was performed using SAS statistical software and comparison of mean was performed using the least significant difference (LSD) at the level of 5% probability. Figures were graphed with Excel software.
 According to this study results, the effect of foliar application of sucrose and ascorbic acid and their interaction on most of the studied traits was significant. Application of 15 g.l-1 sucrose with 15 mM ascorbic acid increased the number of fruits to 1.68 per plant, which showed an increase compared to the control treatment. The highest total number of seeds with an average of 464 seeds per fruit was obtained by applying 5 g.l-1 sucrose with 45 mM ascorbic acid, which compared to the control (247.33) recorded an increase of 87.60%. The highest total chlorophyll content was measured with an average of 2.081 (mg.g-1 fresh weight) using 5 g.l-1 sucrose with 15 mM ascorbic acid, which showed an increase of 1.81% compared to the control treatment (2.044). Also, application of 15 g.l-1 sucrose along with 15 mM ascorbic acid increased protein by 40.03%, which showed an increase of 79.26% compared to the control (22.33). Other results indicate that increasing the amount of seed oil up to 44.50% is available with the application of 15 g.l-1 sucrose with 30 mM ascorbic acid and also with the application of 10 g.l-1 sucrose with 45 mM ascorbic acid; which had an increase of 16.61% compared to the control (38.16). The results of the present study showed that the application of combined ratios of sucrose and ascorbic acid has been effective in improving the quantitative and qualitative attributes of pumpkin, including protein content and percentage of pumpkin seed oil.
 Since the treatment of sucrose 10 g.l-1 with 45 mM ascorbic acid significantly affected most of important attributes such as total antioxidant activity, total flavonoids, protein content and high oil content, therefore, this combination of treatment can be applied to increase the quality of pumpkin seeds. However, if only quantity is important, the treatment of sucrose 15 g.l-1 with 15 mM ascorbic acid, which caused the highest number of fruits per plant, the highest yield as well as the highest protein, can be recommended.

To evaluate the effect of grafting cucumber (Cucumis sativus var. Super daminos) on Cucurbita moschata collected in Isfahan and Cucurbita pepo on plant growth and physiology, comparing with self-grafted and non-garfted as a control an experiment was designed. The experiment based on carried out as a compound experiment based on a completely randomized design (CRD) with 4 replications. Treatments were temperature included optimum temperature (27±2) and cold temperature (12±2) on cucumber (Cucumis sativus var. Super daminos) in the greenhouse of Isfahan University of Technology. Results were shown that the dry weight of the shoot decreased with temperature stress and grafting on C. moschata and C. pepo (Isfahan) enhance the dry weight of the shoot under stress. Grafting on Isfahan rootstock and self-grafted cucumber increased chlorophyll content compare with other treatments in optimum condition. Grafted cucumber on C. pepo (Isfahan) increased photosynthesis compare with other treatments in stress conditions. Mesophyll conductance decreased in stress temperature and grafting on C. pepo (Isfahan) improved it. Generally, grafting on C. pepo (Isfahan) with improving some growth and physiological characteristics of cucumber increased it tolerate to low temperature compare with non-grafted plants.

Investigating the behavior of market players in pricing higher than the competitive level determines the bargaining power of the higher economic profits and leads to their market power. This is especially important for policymakers in terms of equity pricing in agricultural pricing policies. Fruit consumption plays an important role in diet variability and prevention of chronic diseases. Given the significant share of these products in horticultural production on the one hand and their unique role in providing household food security on the other, it is necessary to analyze the market power of supply chain actors. Therefore, the purpose of this study was to investigate the behavior of fruit market players in each of the supply chains using weekly data during the period 2012-2017 in Tehran. The findings showed that the wholesale market power of all products except apple and watermelon was higher than the retailer and dominated the other levels throughout the entire marketing chain. The results also showed competitive behavior in the market for all fruits except oranges, and finally, market players reacted differently to relative price changes at different levels of the supply chain. Therefore, it is recommended that planners try to modify the behavior of market players against relative price changes at different levels of the supply chain.

Brassicaceae (Cruciferae) with more than 3660 species in the world and about 900 species in Irano-Turanian region having the highest diversity, includes annual, biennial, perennial herbs or shrubs. The family members are mainly distributed on the earth land surface exceptional Antarctica and tropics. Despite having silique fruit, they have many variations in exo-morphology and other properties of fruits and seeds that are important in their diagnosis and identification. Studies of these characters can revealed the relationship between taxa and used for their taxonomy. In addition, the identification of seeds and fruits is important in agriculture, food industry and weed control. Thirty two quantitative and qualitative fruit and seed characters of 24 collected wild Brassicaceae taxa from the central Iran in Irano-Touranian region were examined using ruler, digital calipers, millimeter paper, graticule and a monitoring zoom binocular light microscope. Obtained data were recorded and then a key was prepared based on the studied Brassicaceae fruit and seed morpho-biometric. Results showed morpho-biometrical studies of siliques and seeds of Irano-Touranian Brassicaceae members may support identification of the family taxa.

Today, there is a growing interest in using cultivation methods such as natural biostimulants, which improve yield without any negative effects on plant quality. Such a strategy allows for increasing biomass production, but also induces the natural resistance of plants, as well as improves nutraceutical quality of plant food. Products of natural origin, such as seaweed extract are used as a stimulator of the growth and development of agricultural and horticultural plants. Seaweed extracts contain a wide variety of plant growth-promoting substances such as auxins, cytokinins, betaines, gibberellins, and organic substances, including amino acids, macronutrients, and trace elements that improve crop yield and quality. The aim of this study was to investigate the effect of different extraction methods of two red seaweed species: Gracilaria corticata and Acanthophora spiciferais on growth, physiological indices and fruit yield of Ecballium elaterium.

This experiment was carried out as a completely randomized design with four replications in the research greenhouse of University of Zanjan during 2020 on growth and yield of Ecballium elaterium. Experimental treatments include 5 extraction methods (ME: microwave extract with aqueous solvent, OE: autoclave extract with aqueous solvent, BE: extract extracted by boiling with distilled water, NE: extract extracted with liquid nitrogen, EE: soaked extract in ethanol) and a control sample (C: (foliar application with distilled water)). During the growth cycle, the number of leaves, the number of male and female flowers and the number of fruits were measured. At the end of the growing season, number of lateral branches, plant height and lateral branch length, leaf area index, fresh and dry weight of shoots, fresh and dry weight of fruit and fruit yield, root length and diameter and root sub-branches, root volume and area, Total chlorophyll, carotenoids, total phenol and total flavonoids contents were measured.

The results showed that foliar application of seaweed extracts had significant effects (P < 0.01) on all traits. The plants treated with extract extracted by aqueous solvent in autoclave method was increased 43.6% plant height, 59.4% lateral branch length, 58.3% shoot fresh weight, 71.7% shoot dry weight, 65.7% number of male flowers, 39.5% number of female flowers, 41.6% fruit number, 20.2% fruit fresh weight, 32.8% fruit dry weight, 55.6% fruit yield, 70.5% root length, 80.7% root volume and 66.9% flavonoids content compared to control plants. Also, the highest leaf area index with increasing 42.9 and 41.5%, root diameter (57 and 53.4%), root area (78.3 and 73.9%), total chlorophyll (45.8 and 45.2%), carotenoids (69.3 and 71%) and total phenol contents (42.6 and 43.2) was observed in plants treated with the extract resulted of autoclave and microwave method, respectively compared to control plants.

According to the results, all methods of extracting red seaweed extract had positive effect on the growth, physiological traits and fruit yield of watercress. But in general, newer methods (autoclave, microwave) had better effect than traditional methods (boiling, liquid nitrogen, and ethanol), and extracts of these methods had more growth hormones, organic compounds and nutrients. Therefore, autoclave and microwave methods are proposed to extract seaweed extract. These results showed that the red seaweed Gracilaria (Gracilaria corticata) and Acanthophora (Acanthophora spicifera) of the Persian Gulf region, if extracted properly, can be a suitable biofertilizer for plant production.

This study was carried out to determine the quantitative and qualitative characteristics of 60 almond cultivars and genotypes in climatic conditions of Meshkin Dasht Horticultural Research Station in Karaj and to determine their characteristics in order to select the best cultivars. These cultivars and genotypes were planted in a randomized complete block design with 3 replications. The studied cultivars and genotypes were evaluated for important vegetative and pomological traits. Results showed that K9-7, K2-22, K3-16, K2-9, Sh15 and KD-11-01 genotypes and Shokofeh, Nonpareil and Price cultivars had paper shell nuts that had good marketability. Shokofeh, Ferragnès, A230, A200 cultivars and K13-40 genotype had a lower chance of being exposed to late spring frosts due to late flowering on average 20 to 25 days depending on the cultivars compared to Sefid cultivar. Also, for two years in terms of yield in 2016 and 2017, Filippo Ceo, Ferragnès cultivars and K9-24 and K8-24 genotypes had the highest yield. In the general evaluation of important traits of cultivars and genotypes; Nanparil cultivar and KD-11-01 genotype were identified as the best cultivar and genotype in terms of soft shell fruit and A230, A200 and Ferragnès cultivars and K13-40 genotype with hard shell fruit.

The firmness of the orange texture can be considered as an important criterion for determining the quality and freshness of this product and its texture characteristics have a great influence on its acceptability and marketability. Orange is an important product in the south of Kerman province, having sufficient knowledge and information about its texture mechanics is also important for the development of orange industries and processing equipment, especially orange concentrate production industries. In response to need the mechanical properties of the orange texture, punch test method was proposed as a suitable and non-destructive testing method. In this research, firmness, force, stress and consumption energy of five common orange varieties (Valencia, March, Washington Navel, Blood and Local Jiroft) was determined and compared by punch test method with seven punch diameters (4.3, 4.6, 9.7, 9.5, 11.1, 12.7 and 14.3 mm). The results showed that the effect of variables of punch diameter, variety, and also the interaction effect of punch diameter × variety on the force, firmness, stress and energy were significant at 1% level. The combination treatment of local cultivar with a punch diameter of 12.7 mm has the maximum value of force (79.0 N) and firmness (7.9 N/mm), and the minimum value of force (15.5 N) and firmness (1.5 N/mm) was obtained in the combination treatment of blood variety and punch diameter of 4.8 mm. The highest mean of stress (1.5 MPa) and the lowest mean stress (0.3 MPa) were in the combination treatment of local variety and punch diameter of 4.3 mm, and the combination treatment of blood variety and punch diameter was 14.3 mm.

 Strawberry with the scientific name Fragaria × ananassa Dutch from the Rosaceae family is an important commercial fruit in the world, which is widely considered in terms of nutrition due to its rich content of vitamins, minerals and phytochemicals. Water scarcity stress is one of the important sources of abiotic stresses, so that it reduces growth, development and yield during the vegetative, reproductive and maturing stages of the crop. Studies have shown that application of nano-fertilizers can be useful in order to achieve high yield while reducing the amount of fertilizer consumption due to its higher absorption due to its high specific surface area. Despite its low consumption, zinc is involved in chromosome synthesis, carbohydrate metabolism, photosynthesis, sugar-to-starch conversion, protein metabolism, auxin metabolism, pollen grain formation, biological membrane preservation, and resistance to infections by pathogens. Zinc is also needed for chlorophyll production, pollen grain yield, fertility and pollen grain germination. Zinc as a coenzyme is also involved in the activation of many enzymes in the biosynthesis pathway of secondary metabolites. The use of zinc nanoparticles can have very positive effects on the quantitative and qualitative properties of strawberry fruit during low solubility

The present study was conducted in the greenhouses of the Department of Horticulture, Urmia University.Sabrina cultivar strawberry seedlings were planted in culture bags containing 50% cocopeat, 25% pithomass and 25% perlite in three rows containing 27 plants and evenly pruned. The first week was used to establish the plants from water, the second week to the sixth week for vegetative growth of half-concentrated Hoagland solution and from the seventh week to the end of the harvest period, depending on the stages of flowering to fruiting, modified Hoagland nutrient solution was used. By calculating the amount of solution output from each nozzle and the amount of each plant need, the time required for solution was calculated and this time was divided into 5 times a day and was automatically pumped to the foot of each plant. To apply low solubility stress, the first row (without stress) was used with solution 5 times a day, the second row with solution 4 times a day and the third row with solution 3 times a day. Foliar application of different concentrations of zinc chelate nanoparticles was performed once a week (5 times) after pruning of primary flowers, from the fourteenth to the eighteenth week. Zinc chelate nanoparticles were used in three levels (0, 1 and 1.5 g / l) and nutrient solution treatment was performed in three levels (90, 110 and 130 ml) daily. Then fruits that were more than 70% colored were harvested and different quantitative and qualitative characteristics were measured. At the end of the experiment, fruit weight was measured using a digital scale, fruit length and width by caliper, fruit acidity by pH meter, titratable acids by titration method and TSS by refractometer. Chlorophyll a, b and total carotenoids were also measured using Dynamica spectrophotometer (HALODB-20) according to Lichtanthaler & wallborn (1985). Also, fresh weight of shoots and roots were measured in the last stage after fruit harvest. For this purpose, the plants were completely removed from the bed and the roots were washed with water and then exposed to air to remove moisture. The aerial parts were then separated from the roots and weighed 0.001 g by digital scale. To measure dry weight, the roots and aerial parts were placed separately in the bag and then placed in a 70 ° oven for 72 hours and then weighed 0.001 g with a digital scale.

 The results showed that the interaction effect of low solubility treatment and zinc chelate nanoparticles treatment on fruit weight, shoot dry weight and yield was significant, so that the highest amount was in the treatment of 130 ml of nutrient solution and concentration of 1.5 g / l of zinc chelate nanoparticles. Also in fruit length and width, pH, TA, TSS, chlorophyll a and b and carotenoids, the main effects of low solubility treatment and of chelate nanoparticles were significant. As in the treatment of chelate nanoparticles, the highest amount of these traits was observed in the concentration of 1.5 g / l nanoparticles and in the low solubility factor, the highest amount was observed in the control treatment (complete solubility).

 Low solubility stress reduced the quantitative and qualitative characteristics of strawberry fruit. The use of different concentrations of nano-chelate zinc improved these properties, so that the greatest effect was related to the concentration of 1.5 g per liter of nanoparticles. This concentration increased the yield of the product more than 1.6 times compared to the control sample in complete solution and more than 1.7 times compared to the low solution. Also, the growth traits studied were significantly increased by the use of nanoparticles. These nanoparticles also improved the taste of the fruit by reducing the acidity and increasing the soluble solids.