Long-term effect of integrated nutrient management on yield sustainability and soil fertility of rice (Oryza sativa) -wheat (Triticum aestivum) cropping system

Vikas Gupta; Sharma, R.S.; Vishwakarma, S.K.

Indian Journal of Agronomy 51(3): 160-164

2006


ISSN/ISBN: 0537-197X
Accession: 013419489

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Abstract
A long-term experiment was conducted on integrated nutrient management in rice (Oryza sativa)-wheat (Triticum aestivum L. emend. Fiori & Paol.) system at Jabalpur (Madhya Pradesh) since rainy (kharif) season 1987-88 to maintain the sustainable and high grain yields of this system without degradation of soil health under irrigated production system. The present paper deals with the studies conducted during the 2002-03 and 2003-04. Substituion of 50% N by green leaf manuring with sunnhemp (Crotalaria juncea L.) attained highest system productivity (33.12 kg grain/ha/day). While determining the sustainability yield index (SYI), the value was also maximum with 50% NPK + 50% N through green manuring with sunnhemp to rice, followed by 100% NPK to wheat. Maximum soil available nitrogen, phosphorus, potassium, sulphur and zinc, and minimum bulk density were noticed with substitution of 50% N by green manure. However, the pH value and EC were almost constant in all the treatments. Integrated use of 50% NPK and 50% N through green manuring of sunnhemp to rice followed by 100% NPK to wheat also fetched the maximum net monetary returns (Rs 34,403/ha/year) with the benefit: cost ratio 2.40.