Thermal and radiation use efficiency of Bt cotton under varying irrigations and nutrient management practices

摘要

A filed experiment was conducted during 2015-2016 to compution of agrometeorological indices i.e. growing degree days (GDD), heat use efficiency (HUE), hello thermal use efficiency (HTUE), and radiation use efficiency ( RUE) for Bt cotton under varying irrigation frequencies and nitrogen levels. Four levels of irrigation applications (ll = 0.60 Epan, I2 =0.80 Epan, I3 = 1.00 Epan and I4 control) and four different levels of nitrogen (F, = RDN + K, F2 = Extra (75%) RDN + K, F3 = Extra (50%) RDN +K andF4 = Extra (25%) RDN + K) were placed in randomized block design with replications. Results revealed that the dry matter accumulation, Kapas yield, heat use efficiency (HUE), hello thermal use efficiency (HTUE) and radiation use efficiency (RUE) were significantly influenced by irrigation and nitrogen levels on Bt cotton. Irrigation tried at 0.60 Epan and nitrogen applied at RDN + K significantly recorded higher agrometeorological indices and on a par with irrigation at 0.80 Epan and 25 per cent extraRDN + K applied.