Abstract

Yield data of rice (AD1 31 and IR 20) from experiments (type A) conducted in col- tivators' fields under the auspices of All India Coordinated Agronomic Research Project were utilized to explore the possibility of formulating a theoretical basis for rationalizing fertilizer recommedation to rice. Relationship f grain yield of rice with applied major nutrients was established in quadratic response function. An optimization procedure for working out the N, P,O, and K,0 doses corresponding to maximum yield is proposed. From the results it appears that the presant lavel of blanket recommendation for N appli cation to rice is lower than the optimal dose in kharif in the four agro-climatic zones studied For rabi, there is need for further experimentation with wider ranges of N levels as optimal levels of N obtained were very high and unrealistic. With respect of P₂O and K.O the present level of recommendation is rather close to the optimal values obtai ned in this study.

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