Phosphorus Mobilizing Capacity of Selected Grain Legumes Grown Under Phosphorus-Deficient Conditions

Compared with other crops, legumes have superior ability to mobilize part of non-labile phosphorus (P) into labile/available forms. We explored the P-mobilization potential selected grain and its influence on growth, P uptake, yield under P-deficient conditions. A pot experiment was carried out in a greenhouse soybean (Glycine max L.), cowpea (Vigna unguiculata green gram (Vigna radiata black mungo L.) two fertilizer applications; without (Pdeficient) (P-sufficient) Department Agriculture recommended rates triple super phosphate. Each crop harvested at maturity bulk rhizosphere soils were collected quantify different fractions using Hedley’s sequential fractionation. Dry weight accumulation plant organs, i.e. roots, stems, leaves, pods, measured. Most organs maintained similar dry tissue-P concentration irrespective levels applied. All crops reduced their total plant-P uptake However, this did not make any change either pod or pods. Soybean mung bean had greater compared both levels. In contrast, showed improved use efficiency (PUE) than legumes. Available (NaHCO3-P) soil is that whereas NaHCO3-P content greatly decreased when cultivated soil. The fraction all significantly low Results suggest could be as they can adapt through enhancing increasing PUE.