Radiation use efficiency of maize hybrids as influenced by graded levels of nitrogen
Authors: Sridhara.S, Santosh Kumar.T.V, Geetha.K.N, Suresh Naik.K.P & Krishnamurthy.N
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In order to study the effects of nitrogen levels on RUE of maize hybrids, a field experiment was conducted at college of agriculture, Navile, Shimoga during kharif of 2012 under rainfed conditions on sandy loam soil. The experiment was laid out in Factorial Randomized Complete Block Design with three replications. There were twelve treatment combinations comprised of two maize hybrids (SDH and LDH) and six nitrogen levels (0, 50, 100, 150, 200 and 150 kg N ha-1). Results indicated that nitrogen levels had significant effects on RUE of maize hybrids. The higher cumulative leaf area index, PAR (1477.2 g MJ-1), mean RUE (1.55 g MJ-1) and grain yield (6327 kg ha-1) was recorded at the application of 250 kg N ha-1 and it was on par with treatment which receives 200 kg N ha-1. Treatment which receives 0 kg N ha-1 recorded significantly lower cumulative PAR (1035.0 g MJ-1) and RUE (1.10). The higher cumulative PAR (1354.2 g MJ-1), and RUE (1229.0 g MJ-1), was recorded in the LDH compared to SDH. This might be due to higher leaf area index and leaf area duration of LDH resulted in better utilization of sunlight which leads to higher grain yield compared to SDH. In interaction effect the treatment which receives LDH and 250 kg N ha-1 recorded higher leaf area index (3.07), PAR (1530.0 g MJ-1) and grain yield (6574 kg ha-1).