جستجوی مقالات مرتبط با کلیدواژه « ماده خشک » در نشریات گروه « باغبانی »

The present study was conducted as a factorial study in a randomized complete block design on Hayward cultivar kiwifruit vines for two years. The first factor included the intensity of summer pruning in four levels, and the second factor included pruning time at two levels. The results showed that fruit yield and size were affected by the interaction of pruning intensity and pruning time, and the leaf-to-fruit ratio, light transmission through the canopy, and fruit firmness were affected by pruning intensity. The highest yield, with 126.2 kg/vine, was observed in zero leaf pruning one month after fruit set. Pruning after 3-4 leaves after the last fruit and pruning after the last fruit reduced the leaf-to-fruit ratio and increased light transmission from the canopy of kiwifruit vines. Different pruning treatments increased the firmness of the fruit by about one unit compared to the control, but had no significant effect on the amount of soluble solids, vitamin C, and dry matter. According to the results of this experiment, zero leaf pruning within four weeks after fruit set and pruning after 3-4 leaves after the last fruit within a week after fruit set showed better effects on vine growth, yield, and some quantitative and qualitative traits of the fruit.

In order to investigate the effect of planting date on local landraces and varieties of Hibiscus sabdariffa L., a factorial experiment was conducted in a randomized complete block design in Dalgan during the 2019. Planting date as the first factor in five levels (March 6, April 4, May 5, June 5 and July 01) and genotypes and cultivars as the second factor in ten levels (Jiroft, Delgan, Bampour, Iranshahr, Nikshahr, South Rudbar, Saravan and Qale Ganj and two commercial varieties HA and HS-24) were considered. The examined traits included stem diameter, fresh and dry boll weight, sepal dry weight, anthocyanin, and etc. Results showed that the effect of planting date on all studied traits was significant at 1% level. The effect of genotype was significant on the number of days to budding, leaf number, days to 50% flowering and sepal dry weight per plant. The interaction of planting date and genotypes on sepal dry weight, anthocyanin content, seed rate and biological yield were significant at 1% level. The highest sepal dry weight per plant was obtained at May 15 planting date. Also, the local landrace of Dalgan and Saravan had the highest and the lowest amount of sepal dry wieght, respectively. Fresh and dry weight of boll, number of leaves, stem diameter, plant seed and anthocyanin content were significantly correlated with sepal dry weight. As a result, May 15 planting date and local landrace of Dalgan showed higher yield.

In order to study the effect of water deficit stress on yield, essential oil and some of physiological traits in different ecotypes of Thymus daenensis subsp. daenensis, an experiment was performed as split plot design based on RCBD with three replicates, in Karaj (2013). In this experiment, eight ecotypes of this plant were studied under three water deficit treatments including normal irrigation, stop irrigation at the start of flowering and stop irrigation at the vegetative stage. Result indicated that ecotypes under the different level of irrigation showed different responses for essential oil percentage, dry matter yield, chlorophyll, carotenes, proline and activity of catalase, glutathione peroxidase, and polyphenol oxidase enzymes. Close correlation was not observed between essential oil percentage and dry matter yield with chlorophyll, carotene, proline, and enzymes activity. The highest dry matter yield (17.27 gr per plant) was obtained in Malayer Bala ecotype under normal irrigation and the highest essential oil percentage (6.2 %) was obtained in ecotype of Malayer2 under stop irrigation at the vegetative stage. The highest essential oil yield as the most economical important was found in ecotype of Arak under the both stress treatments.

Spinach is one of the most important leafy vegetables, rich in calcium, phosphorus, potassium, vitamin C and B-carotene, and it is likely to be Iran's origin. More than 30 percent of the area under cultivation of in Iran leafy vegetables, allocated to spinach plant. Spinach is a cool season crop and its cultivation is done inthe fall and in early spring. Various regions of Iran, has the vast genetic diversity in relation to the mass of spinach. In a study to evaluate the yield and agronomic traits spinach 121 mass Iran, the masses were divided into six clusters that each cluster has specific morphological and agronomic traits. Leafy vegetables, especially spinach are the main sources of nitrate absorption and about 70 percent of total dietary nitrate intake per person per day is provided by leafy vegetables.
Material and To study the preliminary agronomic and morphological traits and nitrate amounts of 100 Iranian spinach mass are available in GenBank, an investigation was carried out in Agriculture and Education Center Research in Esfahan for two years (2013-2014) by using of five mass dominant cultivars, and two control landrace (Varamin 88 and Varamin prickly seed). The aim of the first year of the study was the primary isolation of superior landraces based on agronomic traits of spinach. At the end of the first year of growth, seed traits, including the type (smooth-prick), the width of the blade, leaf color, wrinkling of leaf area, leaf thickness, the petiole (standing, half-standing and sleeping), petiole length, shape of leaf, the shape of the leaf tip, bolting during plant growth and the number of male and female were determined. A total of 25 landraces selected in the first year of study were compared in the second year using a randomized complete block design with three replications. Studied traits were: yield, dry matter yield, number of leaves, leaf length, leaf width, and petiole length and nitrate levels. Statistical analyses of the data, correlated traits were performed using SAS software and comparisons of means calculated by using LSD at 5%.
Result and The results showed that 21.5% of the populations used in this study had the petiole with a standing (vertical) position and 25.2% of them had a long petiole. Length of the petiole and hoisted were considered desirable trait for mechanized harvesting. However, varieties have high nitrate concentrations, or in cases where the management of nitrogen fertilizers does not do well, longer tail leaves are an undesirable trait because the accumulation of nitrate in the tail leaves is more than leaf spinach. 35.5% of spinach leaves landrace used in this study were green color. Leaf color in leafy vegetables is very important. Leaf length, have a range of 11 cm in the Kashan, up to 18 cm in mass TN-69-101 (collected from Lorestan). In this study the agronomic characteristics of the mass of the spinach, length of leaf blade mass in Kashan, Shahreza and Najaf Abad, were 15.50, 11.50, and 9.50 cm, respectively, and all three populations were significantly different in this respect. A significant positive correlation was observed between leaf length and leaf width (0.7 **). The highest of fresh yield was 32.59 t ha-1 and produced by Varamin 88 that with six masses (TN-69-73, Varamin- prickly, TN-69- 74, TN-69-153, TN-69-140, TN-69-58) did not differ statistically. Three populations of TN 69-153, TN-69-140 and Varamin- prickly (advanced masses prickly Varamin) both in terms of fresh and dry matter yield were superior. The (TN-69-78) mass with 17 leaves, the highest, and (TN-69-22) mass with 11/33 leaves, the lowest number of leaves produced among the different masses. Leaf blade width in the mass TN 69-31, was equal to 12/38 cm and with the eleven other populations had a significantly blade width more than other the masses. In terms of nitrate in shoots, TN-69-153 population with 1708 mg of nitrate per kg of dry matter had the highest amount of nitrate.
The results of this study showed that considering the diversity traits among different populations of spinach in various parts of the Iran can be provide suitable potential for agronomic and breeding purposes. The masses after selection and purification can be available to farmers and producers.

Dry matter accumulation and cytokinin (zeatin and zeatin riboside) levels of grains in various positions within the wheat (Triticum aestivum L. Var. Pishtaz) spike and spikelet were investigated during the grain filling duration. This experiment was conducted in greenhouse of Islamic Azad University¡ Saveh Branch¡ in 2010-11 farming year. Main shoot of wheat were partitioned into proximal¡ middle and distal regions and further into bold (basal) and small (apical) grains. Ten labeled spikes were sampled every 4 days from 3 days after anthesis (DAA) to 23 DAA¡ and every 7 days from 23 DAA to maturity. Results indicate that the cytokinin level increased rapidly from about 7 until 15 days after anthesis and then decreased depending upon the position of grains in spike and spikelet. The differences in cytokinin levels¡ both among spikelets in different regions of the spike and also among grains within a spikelet¡ were positively correlated with the differences in dry matter accumulation. Higher zeatin and zeatin riboside contents in the grains at the early grain filling stage¡ may promote the division of endosperm cells¡ thus constitute a powerful sink¡ and enhance assimilate migration and its accumulation in the developing grains. The results suggest that cytokinins in the grains during the early phase of grain development play an important role in regulating grain filling pattern and consequently influence grain filling percentage.

Summer pruning and calcium spray could improve kiwifruits quality. In this study، effect of summer pruning in two times، 2 and 15 days after petal fall alone or in combination with %1 calcium chloride spray on fruit quality and mineral elements contents of ‘Hayward’ kiwifruit was investigated. Calcium sprayed four times 90 days after petal fall with 15 days intervals. The results showed that summer pruning، especially 2 days after petal fall significantly increased fruit diameter، fruit weight and total soluble solid (TSS). Control vine)without summer pruning and calcium spray) had the lowest dry matter and vitamin C content. Fruit calcium and magnesium concentration and also nutrient elements ratios were significantly affected by summer pruning and calcium spray. In contrast، nitrogen، phosphorus and potassium content were not affected by them. The highest calcium and the lowest magnesium content were found in the vines that pruned 2 day after petal fall alone or in combination with calcium spray. The highest nutrient elements ratios، K/Ca، Mg/Ca، N/Ca was found in control vine (without pruning and calcium spray). Overall، summer pruning and calcium spray could.

Aloe vera is a perennial liliaceous plant with succulent green leaves joined at the stem in a whorled pattern. It is highly appreciated due to its short growth period and high economic value among all the aloe species, and is used in pharmaceuticals, cosmetic products and food products. In order to improve Aloe vera cultivation in soilless culture, an experiment was conducted in 2011 in greenhouse of College of Agriculture, University of Guilan, Rasht, Iran, as a split plot bi-factorial in completely randomized design with four replications. Four nutrient solutions containing different levels of nitrate and potassium were the main plot, which were sampled at six different periods. Results revealed that the nutrient solutions affect measured traits after 5-6 months. In other words, in research programs for this plant, it is better to record the data for at least 5-6 months. In general, the nutrient solution containing 9.8 mM nitrate and 5.8 mM potassium lead to the best results in all sampling periods. In fact, Aloe vera plants respond positively to high levels of nutrients and in solutions containing the highest level of nitrate and potassium show the highest amount of measured traits.

In order to study the adaptability and bulb yield characteristics of 12 short day onion cultivars for sowing in autumn in Isfahan, an experiment was conducted at Kabootar Abad Research Station of Isfahan during two growing seasons (2007-2008 and 2008-2009). The experimental design was Randomized Complete Blocks with four replications. Cultivars included: 1- Pegasus, 2- Grano 6835(XP 0759 6835), 3- Hyb. Cirrus, 4- Texas Early White, 5- Hyb. Jaguar, 6- Century (EX 0759 2000), 7- Calera, 8- Hyb. Primavera, 9- Lahoya, 10- Texas Yellow Grano 502 (common cv. in region), 11- Contessa and 12- Hyb. Savannah Sweet. Seed were sown in early October and common cultural practices were followed. Analysis of variances showed that the effect of year was not statistically significant. Results showed that Hyb. Cirrus produced significantly the highest total (109.39 t/ha) and marketable yield (94.47 t/ha) and Lahoya produced the lowest total (28.19 t/ha) and marketable yield (16.17 t/ha). Total and marketable yield in Texas Yellow Grano 502 were placed after cirrus. Bulb diameter and bulb height decreased as bulb yield decreased. Among cultivars, Hyb. Jaguar with 4.66 mm and Lahoya with 2.58 mm had the thickest and thinnest bulb neck, respectively. Hyb. Contessa produced the highest bulb dry matter (10.38%) and total soluble solids (10.70%). The lowest DM and TSS were belonged to Primavera and Savannah Sweet respectively. There was a significant correlation between DM and TSS (r = +0.71). In conclusion, Hyb. Cirrus showed good adaptability and performed better than the other cultivars in Isfahan area.