Effect of organic and inorganic anions on availability of phosphorus applied through different phosphorus fertilizers to moong‐bean grown in soil

Abstract

The effect of the presence of different anions (oxalate, citrate, sulphate, and chloride) on phosphorus (P) availability from different P sources [rock phosphate (RP), single superphosphate (SSP), and diammonium phosphate (DAP)] in a P‐deficient soil of Haryana (India) was studied. The moong‐bean (Vigna radiata) was the test crop. Grain and straw yield of moong‐bean, P uptake by grain and straw increased with increasing levels of P applied through three sources and in presence of different anions. The relative agronomic effectiveness (RAE) of soluble fertilizer (SSP and DAP) were much higher than water insoluble P (RP). The RAE of DAP in presence of anions was greatly affected by the type of anions. The percent utilization of added P generally increased with increasing P levels applied through RP but it decreased with increasing P levels when applied through soluble P sources (SSP and DAP). The values of P utilization for RP were smaller, even at highest P level, than for SSP and DAP recorded at any level. Grain and straw yield, total P uptake, and percent P utilization from each source and P levels were highest in presence of oxalate ions and the values for these parameters decreased in order of oxalate, citrate, sulphate, and chloride.