Abstract
Nine fertilizer treatments comprising levels, time of application and one control were evaluated on cultivators fields of western Uttar Pradesh to study the effect of potassium application in rice (Oryza sativa L.)-wheat [Triticum aestivum (L.) emend. Fiori, Paol.] cropping system. The highest values of yield attributes, yield, and N and K uptake were recorded at K,, irrespective of the time of K application in both the crops. Simultaneous application of nitrogen and potassium proved superior to lone application of nitrogen. The maximum K-use efficiency and benefit : The absolute cost ratio were obtained with .K,N, control treatment showd the lowest values of yield attributes, yield and N and K uptake in both the crops. The depletion of exchangeable K was more in K control (53-97 kg Klha) and low in the treatment receiving K (18-47 kg ma).
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