Influence of Doses and Split Application of Nitrogen and Potassium on Growth Parameters and Yield of Semi Dry Rice to Enhance Productivity under Southern Dry Zone of Karnataka

摘要

A field experiment was conducted at College of Agriculture, Vishweswaraiah Canal Farm, Mandya during the kharif season of 2019-20 and 2020-21 to study the influence of different doses and split application of nitrogen and potassium on growth parameters and yield of semi dry rice. The soil of the experimental site was sandy loam in texture, with low in organic matter content and alkaline in reaction. The experiment was laid out in split-plot design with two levels of N and K and seven times of split application. The data revealed significantly higher growth parameters and yield with the higher level of N+K (125% RDNK) compared to lower dose (100% RDNK). Among the different split applications, N at 4 splits (S_6) as, 25 per cent each at sowing, earlytillering (ET), tillering (T) and panicle initiation (PI) , K at 2 splits (50% at basal and 50% at panicle initiation (PI) produced significantly higher growth parameters and yield than other treatments. However, it was comparable with S_5-N at 4 splitsas, 25 per cent each at sowing, early tillering (ET), tillering (T) and panicle initiation (PI) 100 per cent K at basal, S_3-N at 4 splits as, 10 per cent at sowing, 30 per cent each at early tillering (ET), tillering (T) and panicle initiation (PI), 100per cent K at basal and S_4-N at 4 splits as, 10 per cent at sowing, 30 per cent each at early tillering (ET), tillering (T) and panicle initiation (PI), K at 2 splits [50% at basal and 50% at panicle initiation (PI)]. Lowest growth parameters and yieldwas recorded in T_7-NPK as per UAS-B package (50% nitrogen at sowing, 25% at tillering and 25% panicle initiation, 100 per cent K at basal).