Direct and residual effects of fertilizers applied in wheat‐rice cropping system

Field experiments were made on a sandy clay loam Fluvent to determine direct effects of NPK applied to wheat and their residual effects on succeeding rice at the Indian Agricultural Research Institute, New Delhi. A significant response of wheat was recorded only for nitrogen which when applied at 120 kg N ha^?1 or more had also significant but only little residual effects on succeeding rice. Adequate ? fertilization of both wheat and rice is necessary. Application of ? and ? had no significant on wheat or succeeding rice but NPK application produced the highest grain yield. Wheat‐rice rotation removed 286.4 to 424.4kg ha^?1 of NPK, which is much more than the rates applied. Thus for sustaining good yields from the wheat‐rice cropping system balanced NPK fertilization is recommended.