Vol. 10, Issue 8 (2021)

Author(s):
G Santhosh Kumar, R Mahender Kumar, A Sreenivas, G Jayasree and T Ramesh

Abstract:
A field experiment was conducted during kharif and rabi seasons of 2011-12 and 2012-13 at Indian Institute of Rice Research, Hyderabad to study the performance of different crop establishment methods under different nutrient management practices. The treatment consisted of four establishment methods i.e., system of rice intensification (SRI), modified drumseeder (25X25cm spacing), normal drumseeder and normal transplanting in mainplots and four nutrient management practices i.e., 100% RDN (recommended dose of nitrogen) through inorganic, 75% RDN through inorganic+ 25% RDN through organic, 50% RDN through inorganic + 50% RDN through organic and 100% RDN through organic in sub plots. Experimental results revealed that SRI recorded significantly higher water productivity (kg ha mm^-1) as compared to other establishment methods during all the seasons of experiment. SRI registered significantly higher crop growth rate between 45-75 DAS over other establishment practices, between 45-75 DAT, 75-105 DAT and 105 DAT-harvest, the CGR was on par among planting methods during both the years of study. In respect of root dry weight (g hill^-1) at 60 DAS and 90 DAS SRI and modified drum seeder was on par to each other and was superior to normal drum seeder and normal transplanting. Significant increase in grain and straw yield was observed with SRI followed by modified drum seeder, normal drumseeder and normal transplanting. Under different nutrient management practices 50% inorganic + 50% organic treatment registered higher water productivity, crop growth rate, root dry weight, grain and straw yield as compared to all other nutrient management practices during all the seasons of data.