Effect of Spatial Variability and Nutrient Management Practices on Growth and Yield Attributes in Maize-Groundnut Cropping Sequence

摘要

Field studies were conducted during kharif and rabi / summer 2014-15 to know the spatial variability and effect of nutrient management practices on growth and yield attributes in maize - groundnut cropping sequence at Zonal Agricultural Research Station, GKVK, Bengaluru. The experimental fields were delineated in to 36 grids of 9 m x 9 m using geospatial technology. Soil samples from 0-15cm depth were collected and analysed. There was spatial variability for available nitrogen, phosphorous and potassium during kharif 2014 (123 to 246kg N, 5.4 to 10.0 kg P_2O_5 and 191 to 458 kg K_2O ha~(-1)) and rabi I summer 2014-15 (99 to 197 kg N, 12.1 to 64.0 kg P_2O_1 and 166 to 402 kg K,0 ha~(-1)). This was addressed through SSNM strategy with target yield approach. Application of NPK through drip furtigation in 6 equal splits at fortnightly interval recorded significantly higher growth and yield attributes of maize and groundnut. Application of variable rates of NPK based on NPK variability of grids throughdrip fertigation in six equal splits at fortnightly interval recorded 11.14 per cent higher maize yield (102.38 q ha~(-1)) and 27.28 per cent higher groundnut pod yield (25.24 q ha~(-1)) over blanket soil application as per the recommended dose of fertilizers (92.12 q ha~(-1) maize and 19.83 q ha~(-1) groundnut).