Optimum Spatial and Nutritional Requirements of Bt Cotton Hybrid (Mallika) under Irrigation

摘要

Cotton is the most important commercial crop of India, cultivated over an area of 9 million hectares with a production of 23 million bales. The average productivity was 440 kg lint ha-1 during 2004 (Sreenivasan, 2006). Andhra Pradesh is one of the premier states in the country ranking third in area (11.78 lakh ha) and production (21.9 lakh bales). The productivity was 316 kg lint ha1 (CMIE, 2005). The area under Bt cotton hybrids leaped by 43 times in India and more than four times in Andhra Pradeshduring last four years (control of Biotech crops, 2006). The phenomenal increase in area was mainly due to resistance of Bt cotton hybrids to Helicoverpaarmigera.