جستجوی مقالات مرتبط با کلیدواژه "phosphorus" در نشریات گروه "زیست شناسی"

In order to investigate the effect of foliar application of different levels of benzyl-adenine and glutamic acid on the concentration of elements and some physiological characteristics of Digitalis purpurea L. in one-year and two-year-old plants, a factorial experiment in the form of a completely randomized design with three replications was conducted at the University of Zanjan research greenhouse. The treatments consisted of the effect of plant age (one-year plants and two-year old plants) as the main factor and two levels of benzyl-adenine (0.5 and 1 mM) and two levels of glutamic acid (1 and 2 mM) with the control as a subfactor. The results showed that the highest amount of total nitrogen (1.70%), phosphorus (0.08%), and proline (3.86 mg/g) in the one-year-old plants and the highest amount of leaf magnesium (0.64 µg/Kg) and Soluble sugar (63.26 mg/g) were obtained in the two-year-old plants under foliar application of 1 mM benzyl-adenine. The maximum amount of elements potassium (1.90%), calcium (2.92%), and iron (152.21 µg/Kg) was obtained in two-year-old plants treated with 0.5 mM benzyl adenine. The lowest amount of ion leakage index of leaves (16.31%) and the highest amount of relative water content (89.61%) were recorded with foliar application of 2 mM glutamic acid in one-year-old plants, and the highest amount of catalase enzyme activity (154.4 mg/g protein) and peroxidase (1.61 mg/g protein) were obtained by foliar application of 1 mM glutamic acid in the two-year-old plants. The highest leaf fresh weight (123.51 g) and leaf dry weight (47.93 g) were obtained in the one-year-old plants with foliar application of 1 mM glutamic acid. According to the results, the application of different levels of benzyl-adenine and glutamic acid is recommended to improve the absorption of elements and also to improve the morpho-physiological characteristics of the Digitalis purpurea L.

The present study investigates the effect of nitrogen fertilizers on growth indices, chlorophyll content, protein of the aerial parts, and the amount of potassium and phosphorus in the roots and aerial parts of Euphorbia tirucali. Plants obtained from seven-month cuttings, spent a period of four months in soil without fertilizer (control) or in twelve treatments including biofertilizer containing Azotobacter crococum, urea fertilizer and four common types of NPK fertilizer in two concentrations of 2 and 4 g / l in complete randomized blocks in the greenhouse of the Islamic Azad University of Gorgan from the beginning of March 2019.The growth indices including the dry and fresh weight of the plant, roots and shoots as well as the ratio of fresh and dry weight of the root to the plant have been studied.The results of the present study showed that, contrary to expectations, chemical fertilizers, especially urea, mostly reduced the growth indices and especially the growth of the root system. Biofertilizer also did not improve growth indices compared to the control. Also, the use of these fertilizers did not increase the protein content of the aerial parts. Despite the increase in root potassium in some treatments or the increase in phosphorus transfer from root to shoot in most treatments, the correlation study showed that changes in root potassium or shoot phosphorus content were not correlated with growth changes. However, increase in shoot phosphorus showed a significant positive or negative correlation with shoot chlorophyll a and b content, respectively. Changes in chlorophyll content also had a negative correlation with root system development. The need to reconsider the cost of nitrogen fertilizer for this plant is a practical result of the present work.

Carla plant (Momcrdica Charantia L.) which is usually called bitter melon, bitter gourd, and bitter cucumber, is a medicinal plant from the Cucurbitaceae family. Carla plant has many therapeutic properties such as controlling diabetes, anticancer, and antimicrobial. Considering the indiscriminate use of chemical fertilizers and their effect on reducing the quality of plants and increasing environmental pollution, this research was carried out to investigate the impact of biological and organic fertilizers on leaf chlorophyll index, yield, and quality of Carla fruit. The experiment was factorial in the form of a randomized complete block design with three replications in the years 2021 and 2022. The experimental treatments include mycorrhiza at two levels (inoculation with Glomus mosseae and non-inoculation), plant growth-promoting bacteria at four levels (non-inoculation, inoculation with Azotobacter, inoculation with Pseudomonas and inoculation with both strains) and vermicompost at four levels (0, 4, 7, and 10 t ha-1). The results showed that the chlorophyll index, fruit dry weight, and fruit quality were lower in the second year due to the increase in temperature, decrease in rainfall, and enhance in monthly evaporation compared to the first year. The separate and combined application of mycorrhiza, plant growth-promoting bacteria, and vermicompost had positive effects on the studied traits compared to the control treatment (non-application of these factors). The combined treatments of all three agents had a greater positive effect than their separate applications. The combined treatment of mycorrhizal inoculation and the use of both bacterial strains in the presence of 10 tons per hectare vermicompost had the most positive effect on the studied traits and increased fruit carotenoid, fruit potassium, and chlorophyll index by 80.7%, 30.9%, and 72.7%, respectively. In general, the combined application of biofertilizers and vermicompost improved the yield and quality of karela by increasing chlorophyll and the content of elements.

Identifying the critical time and timing of plant irrigation based on a precise and basic plan is the key to water conservation, improvement of irrigation operations and plant tolerance to water shortage in agriculture. In recent years, vesicular arbuscular mycorrhizal fungi have been used in many plants to deal with dehydration and drought stress. In this regard, an experiment was conducted as split-plot in the form of randomized complete block design with 3 replications in the Yasuj region at years 2015 and 2016. Water stress was considered as the main factor in the form of irrigation after 30, 60, 90, 120 and 150 mm of evaporation from the evaporation pan class A and mycorrhizal fungus was considered as a secondary factor in the form of no application, application of Glomus mosseae and application of Glomus intraradices. The results showed that the interaction of irrigation and mycorrhizal fungi on flower phosphorus, flower yield, biological yield and water use efficiency of Borage was significant. In irrigation levels after 60, 90, 120 and 150 mm of water evaporation from the evaporation pan, the use of mycorrhizal fungi Glomus mosseae and Glomus intraradices compared to the absence of fungi respectively increased the yield of plant flowers (30.04% and 27.35 %), (90.2% and 90.98%), (93.21% and 94.1%) and (81.73% and 78.86%), also, at these levels of irrigation, biological yield and water use efficiency of Borage flower achieved a significant increase in the presence of mycorrhizal fungus, compared to the absence of mycorrhizal fungus application. Application of both strains of mycorrhizal fungus Glomus mosseae and Glomus intraradices in irrigation levels after 90, 120 and 150 mm of water evaporation from the evaporation pan compared to no application of mycorrhizal fungus, respectively, resulted in a significant increase in the harvest index of Borage flower (44.55% and 43.36%), (13.21% and 15.96%) and (5.6% and 5.41%) and flower phosphorus (44.69% and 20.45%), (150% and 125%) and ( 267.74% and 235.48%). Mycorrhizal fungus was able to moderate the negative effects of drought stress and increase the above-mentioned traits in those irrigation levels, and based on the results of this study, irrigation treatment after 90 mm of water evaporation from the evaporation pan + the use of Glomus mosseae mycorrhizal fungi is recommended.

In order to investigate the effect of mycorrhizal fungus on the growth and yield of autumn chickpeas under supplementary irrigation conditions, an experiment was conducted as a split plot in the form of randomized complete blocks with three replications in the 2016 crop year in Ilam. Experimental treatments include supplementary irrigation with three levels of control or rainfed, once irrigation (flowering time), twice irrigation (flowering time and ten days after flowering) in main plots and fertilizer with four levels of control, mycorrhiza, chemical fertilizer (nitrogen and phosphorus) And mycorrhiza with chemical fertilizers (nitrogen and phosphorus) were considered in subplots. The results showed that the effect of fertilizer interaction and supplementary irrigation on pod number per plant, grain yield, biological yield, shoot and root nitrogen was significant. The average grain yield in mycorrhiza fertilizer treatment and double irrigation compared to chemical fertilizer treatment (nitrogen and phosphorus) and rainfed conditions showed an increase of about 59%. In general, the results showed that double supplementary irrigation with the use of chemical fertilizers and mycorrhiza increases the reproductive growth of the plant. This increase is due to increased photosynthesis and consequently more photosynthetic material, which increases the yield components and improves the yield of chickpeas, so the use of this management method to achieve optimal production is recommended.

Eryngium campestre is a medicinal plant belonging to the Apiaceae family, which is very important in the pharmaceutical industry. The present study was conducted to investigate the effect of glycine, nitroxin fertilizer, and humic acid on morphophysiological traits of Eringum campster. The experiment was conducted in factorial based on a completely randomized design with 3 factors namely, nitroxin (0, 1, 2 ml.l-1), humic acid (0, 1, 2 ml.l-1), and glycine (0, 75, 150 g.L-1) and 3 replications in the greenhouse of Gorgan University of Agricultural Sciences and Natural Resources in the autumn of 2019. The measured traits included root fresh weight, root dry weight, root length, plant height, number of leaves, leaf surface, and absorption rate of nitrogen, potassium, and phosphorus elements by leaves. Results showed that the traits measured under nitroxin, glycine, and humic acid factors separately and in combination with each other were significantly different compared to the control. In general, the results showed that the factors used in this study had the potential to improve the quantitative and qualitative traits of the Eringum campster plant and can be used in commercial production.

The present study investigates the effect of sulfur fertilizer on Euphorbia tirucalli L. in pot culture conditions. Plants were cultivated under 10 NPK treatments with sulfur fertilizers (granular or bentonite, with or without thiobacillus and ammonium sulfate each in two concentrations) and one NPK treatment without sulfur, compared with the control in randomized complete blocks for 4 months. Growth parameters including dry and fresh weight of plants, roots, shoots and the ratio of fresh or dry weight of roots to plants as well as protein, chlorophyll, potassium, phosphorus and sulfur content in roots or shoots were measured. NPK fertilizer did not increase phosphorus and potassium uptake but decreased root growth. Addition of sulfur fertilizers except for bentonite sulfur with a concentration of 0.8 g per 80 cm2 of soil with Thiobacillus commercial liquid fertilizer, 250 ml / l, had no effect on recovering the negative effects of NPK and even in most treatments, shoot dry weight and fresh weight decreased. Ammonium sulfate showed the most negative effect on growth parameters. Also, some sulfur treatments had a positive effect on increasing the amount of shoot protein. Chlorophyll a, b and total levels did not show a significant difference between treatments. The effect of sulfur fertilizer on soil pH was different and higher concentration of granular sulfur fertilizer containing Thiobacillus caused a more severe drop. None of the sulfur treatments increased the phosphorus of the shoot and even some treatments had a negative effect on the phosphorus content of the roots as well as the potassium content of the roots and shoots. Only in the treatment of granular sulfur fertilizer with Thiobacillus at lower concentrations, root potassium content increased. Negative effects of sulfur fertilizers were not due to increased sulfur uptake, because the sulfur content changes between treatments were not significantly different.

In order to investigate the effects of humic acid and salicylic acid on quantitative and qualitative properties and nutrients concentrations in leaves of cotton var. Khordad, a two-year field experiment were conducted at the Tehran Agricultural  and Natural Resources Research  and education Center during 2018with randomized complete block  design as factorial with two factors as follow: soil application of humic acid at three levels (zero, seed coated and 10 L/ha as fertigation) and foliar application of salicylic acid at three levels (zero, 2 mM and 4 mM as foliar application), with a total of 9 treatments. The effect of humic acid, salicylic acid and their interaction on yield and yield components, leaf chlorophyll content, concentration of macronutrients in leaves and fiber quality were significant. The highest seed cotton yield (4409 Kg.ha-1) was obtained from the combined application of humic acid in the form of seed coated and salicylic acid in the form of foliar application at a concentration of 4mM that was 49% higher compared to the control Application of humic acid and salicylic acid improved the qualitative characteristics of the fibers, so that the maximum average fiber length of cotton fibers was 31 mm from the combined application of humic acid as seed coated and salicylic acid as foliar spraying with concentration of 4mM  was obtained, which was a 10.7% increase in length compared to the control treatment (without the use of humic acid and salicylic acid). The interaction of humic acid and salicylic acid on the mean concentration of nitrogen, phosphorus, potassium, calcium, magnesium in cotton leaves was significant. In this regard, the highest mean concentrations of nitrogen, phosphorus, potassium, calcium and magnesium of cotton leaves were 3.9, 0.43, 3.9, 1.6 and 0.99%, respectively, from the combined application of humic acid to Seed and salicylic acid were obtained by spraying at a concentration of four per thousand, which compared to the control treatment (without the use of humic acid and salicylic acid), respectively for nitrogen, phosphorus, potassium, calcium and magnesium. 44, 53, 62, 60 and 12% more. Based on the results obtained from this study, the application of humic acid in the form of seed coated and salicylic acid in the form of foliar application in saline conditions, modulates the effects of salinity stress and increases the yield of cotton and improves the quality characteristics of fibers

Plant growth and yield enhancement can be evoked in crops by the exploitation of beneficial microorganisms and the optimal provision of plant nutrients. The effect of inoculation with Serendipita indica and the application of zinc and phosphorus on the growth and yield of strawberries in the aeroponic system was the goal of the present experiment. The study was conducted in a completely randomized design with different levels of inoculation with endophytic fungus S. indica (non-inoculated and inoculated with fungus mycelium) as the first factor and different levels of fertilizer application (0.8 gr zinc sulfate, 1.2 gr monopotassium phosphate, combined zinc-phosphorus and control) as the second factors with three replications. The results showed that the main effects of fertilizer and fungus treatment as well as their interaction effect were significant in all traits except for total protein content. The results also showed that fungus inoculation and zinc and phosphorus application increased traits such as flower and fruit number, shoot and root biomass, chlorophyll, total soluble sugars, protein content, and antioxidant enzymes. In sum, it can be concluded that the effect of phosphorus and zinc fertilizer treatments along with the endophytic fungus S. indica has improved the physiological traits and yield of strawberries. On the other hand, the effects of the simultaneous application of fertilizer and fungus inoculation are more positive than the single application of fertilizer and fungus. Therefore, the optimal application of important elements such as phosphorus and zinc along with the exploration of endophytic symbiotic fungi can be considered a suitable strategy to increase the growth and yield of strawberries.

Although phosphorus owns the lowest amount between essential elements in the plant, but due to its important role in the vital processes of the plant, its supply during the growing period of wheat is essential. This study was conducted to investigate the response of wheat to the use of phosphorus in different stages of its growth and in different conditions of water salinity in pots and in soilless culture system. This experiment were performed in the factorial experiment in a completely randomized design with three factors of irrigation water quality (2 and 8 dS / m), phosphorus concentration (30 and 45 mg/l) and the stage of growth of wheat that receives phosphorus (seedling stage, tillering stage, elongation stage of Stem, flowering and seed filling) and three replications. Plants were harvested at the end of the physiological maturation phase. Root and shoot dry weight, shoot phosphorus concentration, chlorophyll and catalase and peroxidase enzymes were measured. Increased salinity decreased 48% phosphorus concentration of shoots, 40% dry weight of roots and shoots and 100 and 50% increase of catalase and peroxidase, respectively. Increasing the concentration of phosphorus from 30 to 45 mg/l caused 10 and 36% increase in dry weight of roots and shoots, respectively. The highest amount of chlorophyll, root and shoot dry weight due to the use of phosphorus was observed in the stem elongation stage and the lowest values were related to the application of phosphorus in the seedling stage. Based on this research, it seems that fertilization is necessary during the wheat growth period, especially in the stage of elongation of the stem and flowering.

Iris germanica L. is one of the most majestic and popular perennials used in landscape. The aim of this study was comparison of salinity tolerance in three new hybrids genotypes of Iris germanica L. inoculated with mycorrhizal fungi. Treatments consisted of four levels of water salinity (1, 4, 8, and 12 ds/m), three levels of mycorrhizal fungi (0, 15, and 25 g/kg) and three promising genotypes of iris (OPRC-122, OPRC-125, and OPRC-S54). Experiment was conducted based on a factorial and completely randomized design (CRD) with three replications in 2018-2019 in Ardakan University. Some morphological and physiological traits were evaluated. Application of 25 g/kg mycorrhizal fungi at 12 dS/m salinity level increased root length in OPRC122 and OPRCS54 genotypes by 83.77% and 65.38%, respectively compared with control. In OPRCS54 genotype under 8 dS/m salinity, using 25 g/kg mycorrhizal fungi increased the ratio of shoot to root fresh weights by 52.83%. Application of 15 and 25 g/kg mycorrhizal fungi at 12 dS/m salinity in OPRC122 genotype increased P uptake by 341% and 480%, respectively. The use of 15 g/kg mycorrhizal fungi in OPRC125 genotype reduced Na uptake by 32% at 12 dS/m salinity. In OPRCS54 genotype under the same level of salinity, application of 15 and 25 g/kg mycorrhiza fungi decreased sodium uptake by 63.51% and 55.24%, respectively. In general, using mycorrhizal fungi in all three genotypes at salinity level of 8 dS/m reduced the effect of salinity and increased plant yield.

Heat stress is one of the most important weather phenomena that has caused destructive damaged many on agricultural crops, such as strawberries. For this purpose, five temperature treatments (control (23±2 days/16±2 nights), 30, 35, 40 and 45 °C) and two levels of mycorrhizal fungi (presence Funeliformis mosseae or absence) and tow cultivars of strawberry (Paros and Queen Elisa) as a factorial experiment in a completely randomized with four replications was performed in year 2016 in greenhouses at Shiraz university and Agricultural Research Center. The results showed that with increasing temperature, number of flowers in inflorescence, inflorescences per plant, percentage of fruit set, weight, length, diameter and achene of fruit, as well as plant yield decreased in both cultivars. The presence of mycorrhizal fungus on plants after the heat stress treatment increased colonization percentage, fresh and dry weights of root and shoot, leaf area, phosphorus, number of flowers and inflorescences, percentage of fruit set, fruit size, yield, total soluble solids and vitamin C was more than those of plants without mycorrhizal fungus. Plants in the presence of mycorrhizal fungus showed better tolerance to high temperatures than those without the presence of mycorrhizal fungus. The reduction of some evaluated characteristics was lower in cultivar of Paros compared to Queen Eliza at high temperatures which is demonstrated that, the tolerance of Paros cultivar was more at high temperatures. This study showed that the use of mycorrhizal fungi increased the quality and quantity of strawberry and improved heat stress tolerance.

Phosphorus one of the critical macronutrient that plays an important role in energy transfer, phospholipid and nucleic acids synthesis and biochemical compounds in microalgae cells, as well as plays an important role in the formation and transfer of metabolic energy in ATP and NADP. In this study, the effect of different phosphorus concentration (0, 2, 4, 8 and 16 mg/L) on growth rate and biochemical composition of Isochrysis galbana was investigated. The results showed phosphorus deprivation decreased cell growth, pigments and protein; while carbohydrate and lipid content of I. galbana increased as the phosphorus concentration increased. The highest carbohydrate, protein and lipid content were 23.5, 34.6 and 36.2 % in phosphorus concentrations of 0, 8, 0 mg/L, respectively. Also, by increasing the concentration of phosphorus from 0 to 16 mg/l, the content of C16: 0 (33.96%) and C18: 0 (23.4%) decreased to 27.75% and 14.37%, respectively. The results of this study indicate that phosphorus concentration significantly affects the growth rate and biochemical compositions of I. galbana.

To study the effect of organic and chemical fertilizers on the yield and some of the biochemical characteristics of quinoa, a three-factor factorial experiment was carried out in the form of a completely randomized design with three replications in the region of Borkhar, Isfahan, Iran, in the 2018-2019 crop year. In this experiment, Sajama and Titicaca cultivars as the first factor, four levels of  bio fertilizer including: without inoculation, nitroxin inoculation, biophosphorus inoculation, and inoculation with nitroxin and biophosphorus as the second factor, and four levels of chemical fertilizer including control, urea, triple superphosphate (TSP), and urea and superphosphate combination as the third factor were evaluated. Results showed that the interaction of the cultivar, bio fertilizer, and chemical fertilizer were significant on carotenoids, total carbohydrate, soluble protein, grain yield, biological yield and harvest index of quinoa. Thus, the integrated application of bio fertilizers along with all used chemical fertilizer treatments significantly increased the measured traits in both cultivars compared to the control treatment. Although the highest grain yield was observed in Sajama cultivar, Harvest index, which indicated material allocation to physiological destinations (grain), was not significantly different between the two cultivars. In addition, the growth period in Sajama cultivar was 32 days longer than Titicaca that resulted in water requirement increase, and subsequent crop cultivation delay, in Sajama cultivar. On the other hand, all the measured biochemical traits (total chlorophyll, carotenoids, total carbohydrates and soluble protein) in Titicaca cultivar were more than those of Sajama cultivar. Therefore, according to the results of this research, cultivation of Titicaca cultivar along with the application of bio fertilizers as supplements can be considered as an applied strategy to achieve higher quality crops and optimum use of chemical fertilizers to realize the goals of sustainable agriculture in quinoa cultivation.

Phosphorus is an essential nutrient for plant growth and productivity. Since agricultural soils in Iran are predominantly calcareous with very low available Pi content, Pi deficiency has been considered to be a major nutritional constraint for crop production, thus, the application of Pi-fertilizers is essential for satisfactory crop production. The application of Pi-fertilizers contaminates soil and water resources. Therefore, the application of Pi-fertilizers should be reduced through some efficient strategies. The identification of genotypes more tolerant to Pi deficiency is an important low-cost strategy to promote sustainable agriculture in low fertility soils. In this study, the morphological and biochemical responses of five cultivars of common bean (Talash, Mahali Khomein, Sadri, Kosha and Line Ks21191) were evaluated under Pi sufficiency and Pi deficiency. Under Pi-deficient conditions, fresh and dry weights and shoot length were lower while root length was higher in comparison with Pi-sufficient conditions. Under Pi-deficient conditions, the highest and lowest levels of total P were observed in Mahali Khomein and Talash, respectively. The activities of superoxide dismutase and peroxidase in root and catalase in leave showed remarkable increase under Pi-deficient conditions. In conclusion, Mahali Khomein and Talash were the most and the least Pi-deficient tolerant cultivars, respectively.

In an orchard experiment, the effects of foliar application of kaolin, potassium, phosphorus and their different combinations were examined on photosynthesis parameter 8-years-old pistachio trees cv.Kalle-ghouchi in 2016. There were ten treatments, including two rate of P (1 and 2%), two rates of K (1.5 and 3%), kaolin 5%, kaolin 5%+ P 1%, kaolin 5%+P 2%, kaolin 5%+ K 1.5%, kaolin 5%+ K 3% and control (use of distilled water). Foliar application of above treatment were performed in mid Jane when embryo growth is started (the maximum demand for photoassimilates). Photosynthetic parameters (photosynthesis and transpiration rate, stomatal conductance and sub stomatal CO2 concentration), chlorophyll fluorescence parameters (Fv/Fm and PI), photosynthetic pigments (chlorophyll a, b and total and total carotenoids) were measured in 5 stages (the first stage was one day after treatment and the others  were performed with one week interval). The results showed that non of treatments could improve photosynthesis parameters expect Ci while chlorophyll fluorescence parameters were improved by kaolin treatments and photosynthetic pigments were increased by most of experimental treatments. The result also showed that photosynthesis and transpiration rate and stomatal conductance were increased with time and sub-stomatal C02 concentration was decreased. Chlorophyll fluorescence indices and photosynthetic pigments were also increased with time. Totally, the effect of experimental treatments on photosynthetic parameters was under our expectation.

Conventional wastewater treatment systems are not capable of removing phosphorus effectively. The entry of phosphorus into water resources leads to the formation of an Eutrophication phenomenon. One of the methods for phosphorus removal is the use of microalgae. In this way, besides helping with advanced sewage treatment, it can produce algae with many applications. The purpose of this study was to determine the simultaneous and to compare the phosphorus removal (rate of phosphorus) and Spirulina biomass production in a photobioreactor, using two kinds of treated sewage. The experiments were carried out with the manufacture of a photobioreactor and air injection by means of a fine bubble diffuser into sewage-containing reactors. The light source in this test was designed as fluorescent light bulbs and alternating radiation. Urban wastewater effluent and refined sewage were used as a culture medium in a photobioreactor. The amount of phosphorus in the purified sewage was measured by spectrophotometry at a wavelength of 690nm. The phosphorus removal and algal biomass production were measured in different culture medium containing wastewater with various concentrations of phosphorus. The initial concentrations of phosphorus in refined urban sewage and sanitary sewage were 1.96 and 0.4mg L-1, respectively. Phosphorus removal during microalgae cultivation with municipal wastewater and sanitary sewerage (removal of phosphorus) for 8 days, was 71.9% and 37%, respectively. Biomass production in this time were 0.18 and 0.025g/l, respectively. By decreasing the concentration of phosphorus in the wastewater, the amount of biomass production and (removal of) phosphorus removal decreased. Treated domestic and sanitary sewage can be injected directly, without prior treatment, in photobioreactor and it is possible to remove phosphorus and to produce algal biomass.

The bio-availability of phosphorus for primary producers is reduced mainly due to the formation of complex with cations and organic matter in warm-water fish ponds. Therefore, the most important new approaches for increasing water-soluble phosphate that are consistent with the principles of sustainable agriculture are the use of phosphate solubilizing and mineralizing bacteria (PSB). For this purpose, sampling of the sediment of warm-water fish ponds in central regions of Mazandaran province was carried out. Isolation and identification of bacteria were performed using by National Botanical Research Institute (NBRIP) medium and 16s rRNA gene sequence. The ability of strains to grow in the range of environmental parameters of warm-water fish ponds was also evaluated. In the present study, a total of 64 PSB strains were isolated, among these, 11 stronger PSBs were including Pseudomonas taiwanensis (Persian1 and Persian2), P. putida (Persian3), P. umsongensis (Persian4 and Persian5), P. kilonensis (Persian6), P. frederiksbergensis (Persian7, Persian8 and Persian9), P. deceptionensis (Persian10) and Acinetobacter lactucae (Persian11) had the best performance in solubilizing insoluble phosphates. The results showed that these strains have a high ability to dissolve insoluble phosphate compounds and grow well under the environmental parameter of warm-water fish ponds.