Nutrient balance and system productivity influenced by integrated nutrient management in rice (Oryza sativa L.) -wheat (Triticum aestivum L.) cropping system

Yadav, M. P.; Tiwari, U. S.; Rai, J.; Kushwaha, S. P.

Research on Crops 11(1): 59-63

2010


ISSN/ISBN: 0972-3226
Accession: 070631514

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Abstract
A long-term field experiment was carried out from 1983-84 to 2002-03 on permanent lay-out to monitor the 'nutrient balance and system productivity influenced by integrated nutrient management in rice (Oryza sativa L.)-wheat [Triticum aestivum (L.) emend Fiori & Paol] cropping sequence under integrated nutrient management study. Maximum system productivity of 8892 kg/ha was recorded with application of 100% RDF to both the crops (T(5)) and found at par (8639 kg/ha) with 25% N substitution through green leaf manuring in rice and 75% RDF in wheat (T(11)). Thus, there was possibility of reducing NPK dose by 25% in both the crops if 25% N in rice was substituted by green manure. Highest value of agronomic efficiency in the system was noted 47.49 with 50% RDF to both the crops (T(2)) followed by 41.23 in 25% N substitution in rice through green leaf manuring and 75% RDF in wheat (T(11)). The study also revealed that maximum NP and K removal was noted in 100% RDF treatment (T(5)). It was also found that N and P balance was almost positive in all treatments except unfertilized plots, while K balance was noted negative in all treatments. After 20 cycles of experimentation, O. C. and available P status of soil enhanced with inorganic and integrated nutrient supply than its initial levels. Integration of green leaf manuring and FYM enhanced the organic carbon content in the soil.