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Information Journal Paper

Title

CONTRIBUTION OF INORGANIC PHOSPHORUS FRACTIONS TO PLANT NUTRITION IN ALKALINE-CALCAREOUS SOILS

Author(s)

 SAMADI A. | Issue Writer Certificate 

Pages

  77-89

Abstract

 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 concentration 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 measured 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 virgin 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 phosphate (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<0.001) relationships were found for P uptake vs. Olsen-P, P uptake vs. Pi fractions (Ca2-P, Ca10-P, Al-P, Ca8-P, Fe-P) and Olsen-P vs. Pi fractions. NAHCO3-EXTRACTABLE P seems to be adequate for evaluating plant available P in CALCAREOUS SOILS. However, the closer relationship for the Fe-P fraction vs PLANT P UPTAKE than for Olsen-P versus PLANT P UPTAKE indicates that NaHCO3 may not provide the best estimate of plant available P for CALCAREOUS SOILS. Using stepwise regression analysis, it was found that the Ca2-P fraction was most predictive of P uptake (60%), total dry matter (68%), relative yield (74%) and Olsen-P (69%), followed by the Fe-P fraction.

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    • Cite

    APA: Copy

    SAMADI, A.. (2006). CONTRIBUTION OF INORGANIC PHOSPHORUS FRACTIONS TO PLANT NUTRITION IN ALKALINE-CALCAREOUS SOILS. JOURNAL OF AGRICULTURAL SCIENCE AND TECHNOLOGY (JAST), 8(1), 77-89. SID. https://sid.ir/paper/528982/en

    Vancouver: Copy

    SAMADI A.. CONTRIBUTION OF INORGANIC PHOSPHORUS FRACTIONS TO PLANT NUTRITION IN ALKALINE-CALCAREOUS SOILS. JOURNAL OF AGRICULTURAL SCIENCE AND TECHNOLOGY (JAST)[Internet]. 2006;8(1):77-89. Available from: https://sid.ir/paper/528982/en

    IEEE: Copy

    A. SAMADI, “CONTRIBUTION OF INORGANIC PHOSPHORUS FRACTIONS TO PLANT NUTRITION IN ALKALINE-CALCAREOUS SOILS,” JOURNAL OF AGRICULTURAL SCIENCE AND TECHNOLOGY (JAST), vol. 8, no. 1, pp. 77–89, 2006, [Online]. Available: https://sid.ir/paper/528982/en

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