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Journal of Agricultural Science and Technology، جلد ۸، شماره Number ۱، صفحات ۷۷-۸۹
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عنوان انگلیسی Contribution of Inorganic Phosphorus Fractions to Plant Nutrition in Alkaline-Calcareous Soils
چکیده انگلیسی مقاله To evaluate the relationships between soil inorganic phosphorus P (Pi) fractions, the soil P test and plant parameters such as plant P uptake, dry matter yield, tissue P concentra-tion and relative yield, glasshouse experiments and chemical analyses were conducted on 13 calcareous soils from six agricultural and seven adjacent bushland (virgin soil) sites. Four rates of P (0, 15, 30, 60 mg/kg soil) were applied as reagent-grade KH2PO4 to the soils in a randomised complete block design with three replications. Perennial ryegrass (Lolium perenne cv. Roper) was grown and forage was harvested five times over a period of 210 days. Successive harvesting resulted in the depletion of plant available P as meas-ured by NaHCO3-extractable P, which coincided with the decrease in the plant dry matter yield and P uptake. After five harvests, the order of reduction in Pi fractions induced by cropping without added P was Ca10-P>Al-P>Ca2-P>Ca8-P>occluded-P>Fe-P for the vir-gin soils and Ca2-P>Al-P>Ca10-P>Ca8-P>Fe-P>occluded-P for the agricultural soils. The order of abundance of Pi fractions for P treated-soils was non-occluded Al and Fe phos-phate (Al-P+Fe-P)>secondary Ca-bound P (Ca2-P+Ca8-P)>acid-extractable P (Ca10-P)>occluded-P for both virgin and agricultural soils. Although a marked proportion of added P was transformed into less soluble Al and Fe phosphates, successive harvesting had depleted considerable percentages of these fractions. Highly significant (p
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نویسندگان مقاله a صمدی |
department of soil science, urmia university, p. o. box 165, urmia, 57134, islamic republic of iran.
سازمان اصلی تایید شده: دانشگاه ارومیه (Urmia university)

نشانی اینترنتی http://jast.modares.ac.ir/article_4508_f61fae45314efa8dd3aa16d2bed1f177.pdf
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