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Effects of Transgenic Cotton-Based Cropping Systems and Their Fertility Levels on Succeeding Wheat Crop

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Title Effects of Transgenic Cotton-Based Cropping Systems and Their Fertility Levels on Succeeding Wheat Crop
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Creator RAMAN JEET SINGH
I. P. S. AHLAWAT
 
Subject Apparent balance, Bt cotton, FYM, groundnut, nitrogen, organic carbon,wheat
 
Description Not Available
Cotton–wheat is the second most important cropping system after rice–wheat in Indiaand Pakistan, and is practiced on about 4.02 mha. By 2010, more than 6 million Indian farmers had adopted transgenic Bt cotton on 9.4 mha—almost 90% of thecountry’s total cotton area. There is a paucity of information on the effects of intercroppingand integrated nitrogen (N)–management practices in transgenic Bt cottonon productivity, nutrient availability, and soil biological properties in the succeedingwheat crop in a cotton–wheat system. A study was made to evaluate and quantifythe residual effect of two-tiered intercropping of cotton and groundnut with substitutionof 25–50% recommended dose of nitrogen (RDN) of cotton by farmyard manure(FYM) on productivity and soil fertility in a cotton–wheat system at New Delhi during2006–2008. Wheat following groundnut-intercropped cotton receiving 50% RDNsubstitution through FYM had significantly 5% greater grain yield than that after sole
cotton. Residual soil fertility in terms of organic carbon (C), potassium permanganate(KMnO4)-N, and dehydrogenase activity (14%) showed an improvement under cotton+groundnut–wheat system with substitution of 50% RDN of cotton by FYM. Apparent Nbalance as well as actual change in KMnO4-N at wheat harvest was negative in most ofthe treatments, with greater loss (–58.1) noticed under pure stand of the cotton–wheatsystem with 100% RDN of cotton through urea. The study suggested that inclusionof legume and organic manure in transgenic Bt-cotton–wheat system is a sustainablepractice for combating escalating prices of N fertilizers with environmental issues and
instability of transgenic hybrids in south Asian countries.
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Date 2020-05-06T06:10:10Z
2020-05-06T06:10:10Z
2014-01-01
 
Type Research Paper
 
Identifier Not Available
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http://krishi.icar.gov.in/jspui/handle/123456789/35421
 
Language English
 
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