Effect of chiselling, green-manuring and planting methods on productivity and profitability of rice (Oryza sativa)-wheat (Triticum aestivum) cropping system.

摘要

A field experiment was conducted at Karnal, Haryana, India, during 2000-01 to 2003-04, to assess the effect of alternate-year chiselling (after rice crop) in rice-wheat system. Rice (Oryza sativa)-wheat (Triticum aestivum)-greengram (Phaseolus radiatus [Vigna radiata]), rice-wheat-Sesbania aculeata and rice-wheat were tried on flat- and bed-planting systems for improving the productivity of rice-wheat system. Combined analysis showed that alternate year chiselling produced at par rice and wheat yields and rice-equivalent yield compared with non-chiselled treatment. Green-manuring saved 25% N for rice crop and recorded higher rice equivalent yield (15.30 to 15.41 t/ha) compared with rice-wheat system (15.03 t/ha) under flat planting. Bed-planting of wheat recorded 6.5% lower grain yield than flat-planting system. Growing green manure crops improved the land-use efficiency and decreased the production efficiency due to higher duration. Taking green-manure crops increased the cost of cultivation (7.7%), and hence decreased the net returns and benefit:cost ratio compared with the conventional rice-wheat system. Introduction of greengram either under flat or bed planting and Sesbania aculeata incorporation under flat planting increased the organic C content by 13.2% than rice-wheat system. The chiselled plot gave 17-23% higher cumulative infiltration at later stages than non-chiselled plot. It was concluded that wheat on bed produces slightly lower grain yield, chiselling increases infiltration rate and green-manuring saves N and improves the organic C content of the soil.