25. Yield response of wheat to nitrogen and potassium fertilization
Abstract
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.
Keywords: Wheat; Nitrogen; Potassium; Yield; Fertilization
