Yield response of wheat to nitrogen and potassium fertilization

A field study was carried out to evaluate the impact of various nitrogen (N) and potassium (K) combinations on yield of wheat crop during winter 2012-2013.Two factorial randomized complete block design (RCBD) was used for the experiment.There were three levels of nitrogen (90, 120, 150 kg N ha -1 ) and five levels of potassium (0, 30, 60, 90, 120 kg K2O ha -1 ).Nitrogen used at the rate of 150 kg ha -1 significantly improved plant height, grains spike -1 , 1000 grain weight, biological and grain yields of wheat.Similarly, K application at 90 kg K2O ha -1 significantly enhanced plant height by 8%, grain spike -1 by 11%, thousand grain weight by 18%, biological yield by 42% and grain yield by 27% over control however, further increase in K level to 120 kg K2O ha -1 did not significantly improve these parameters.It was concluded that N application at the rate of 150 kg ha -1 in combination with 90 kg K2O ha -1 were optimum for achieving higher yield of wheat.