Field experiments were conducted to study the effect of different rates of nitrogen application, in the absence and presence of FYM, on the tuber yield and uptake of P and K by potato at different stages of plant growth. Tuber yield and P and K accumulation by potato tubers increased significantly up to the application of 200 kg N/ha; whoreas significant Increase In P and K uptake of haulms was, Invariably, up to the application 150 kg N/ha at different periods of plant growth. Application of FYM increased P and K uptake of tubers and K uptake of haulms at all the stages of sampling. However P uptake of haulms was significant only at later periods of plant growth. The Increase in P and K uptake was mainly associated with increase. In the dry matter as a rosult of nitrogen application.
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