EFFECT OF AMMONIUM POLYPHOSPHATE ON THE YIELD OF SOYBEAN (GLYCINE-MAX)

A field experiment was conducted during the rainy seasons of 1987 and 1988 at Indore to determine the effect of ammonium Polyphosphate and o rthophosphate sources on soybean [Glycine max (L.) Merr.]. Liquid fert ilizer ammonium polyphosphate showed an edge over the conventional P s ources, single superphosphate, diammonium phosphate and NPK complex, a s increase in soybean yield was 9.6-13.0%. The enhancement in yield du e to ammonium polyphosphate was accompanied by a conspicuous improveme nt in pod-bearing and seed quality of soybean. Increase in level of P2 O5 application increased in the soybean production in both years under rainfed conditions.