RESPONSE OF SUMMER GROUNDNUT (ARACHIS-HYPOGAEA) TO PHOSPHORUS, BIOFERTILIZER AND SEED SIZE

A field experiment was conducted on clayey soil of Junagadh during sum mer season of 1992 and 1993 to study the effect of phosphorus, biofert ilizer and seed size on yield, P uptake and P status in soil after har vest of groundnut (Arachis hypogaea L.) crop. Phosphorus did not exert their significant effect on pod yield, haulm yield and P uptake. Phos phorus uptake by haulm was significantly increased only up to the appl ication of 25 kg P2O5/ha. Available P2O5 content in soil after harvest the crop was significantly increased with each increase in level of P . Seed inoculation with P. straita recorded higher pod yield, haulm yi eld, P uptake by pod and haulm and P content in soil after harvest in both the years and in pooled results over inoculation. Large seed size recorded higher yield (pod and haulm) and P uptake by pod and haulm a s compared with other seed sizes, whereas P content in soil after harv est the crop was remained unaffected due to different seed sizes.