Influence of irrigation schedules based on IW:CPE ratios, sulphur and plant growth regulators on yield attributes and pod yield of summer groundnut (Arachis hypogaea L.).

摘要

An experiment was conducted at the College Agronomy Farm, B. A. College of Agriculture, Anand Agricultural University, Anand, Gujarat during two consecutive summer seasons of 2009 and 2010. The experiment consisted of 16 treatment combinations comprising four levels of irrigation schedules (IW:CPE ratios) viz., I₁-Control-Irrigation at critical growth stages, I₂-0.6 IW:CPE ratio, I₃-0.8 IW:CPE ratio and I₄-1.0 IW:CPE ratio were relegated as main plot treatment in main plot, two sulphur levels (0 and 25 kg/ha) were relegated as sub-plot treatment in sub-plot and two levels of plant growth regulators [water spray (control) and NAA @ 25 ppm at 30 and 40 DAS] as sub-sub plot treatment in sub-sub plot. The field experiment was laid out in a split split plot design with four replications. For securing higher pod yield, net realization, ICBR and net ICBR from summer groundnut crop cv. GG-2 raised on loamy sand soils of middle Gujarat conditions, it is advisable to apply 11 irrigations, including two common irrigations of 50 mm soil depth-first irrigation applied immediately after dry sowing, second irrigation should be applied at 13 days after sowing for uniform plant stand and the rest of irrigations, each of 50 mm soil depth to be scheduled at IW:CPE ratio of 0.8 at an interval of 8 to 10 days with 25 kg S/ha and application of plant growth regulator NAA @ 25 ppm at 30 and 40 DAS. The interaction effect was found non-significant in some cases.