Productivity and economics of direct seeded rice (Oryza sativa L.) as affected by moisture regimes and seed priming under sandyloam and silty clay loam soils

摘要

Field experiments were conducted in C5 (sandy loam) and Aj (silty clay loam) blocks for two consecutive kharif seasons during 2014 and 2015 at Norman E. Borlaug Crop Research Centre of G. B. Pant University of Agriculture Technology, Pantnagar, Uttarakhand to evaluate the performance of DSR under varying moisture regimes and seed priming in different soil types. The grain as well as straw yields increased with increase in irrigation frequency being the maximum at 15 mm CPE. The mean increase in grainyield at 15 mm CPE irrigation was 4.9 over 22.5 mm and at 22.5 mm CPE by 5.9 over 30 mm CPE. The higher net returns were obtained from 15 mm CPE during both the years. Although, the mean B : C ratio was the maximum at 30 mm CPE (0.97). Hydro-priming recorded marginally higher values of grain and straw yields as well as net returns and B : C ratio over no priming, but did not cause significant variations. During both the years, the mean grain yield in silty clay loam (SCL) soil was significantly higherthan obtained in sandy loam (SL) soil, being 760 kg/ha. DSR in SCL soil registered significantly higher net returns (Rs. 11357/ha) and B:C ratio (37.5) over SL soil. Interaction effect between soil type and irrigation levels on grain yield was significant in both the years. At all the irrigation levels, SCL soil produced significantly higher grain yield than SL soil. In SL soil, the grain yield increased significantly up to 22.5 mm. While in SCL soil, the grain yield at 30 mm CPE was significantly atpar with 22.5 and 15 mm CPEs.