8Robert H J, Earl DV, Jel,emy K G, et al . Economic effect of late irrigation on Mid South cotton [ J ]. Summaries of Arkansas Cotton Research, 2004 : 156 - 160.
9Vaiyapuri K, Mohamed A M, Pazhanivelan S, et al. Yield at tributes, yield and economics of cotton as influenced by intercropping unconventional greenmanures [ J ]. Research Journal of Agriculture and Biological Sciences, 2007, 3 (4) : 302 - 305.
10Sanjib Kumar Behera, Dhyan Singh, B.S. Dwivedi. Distribution of fractious of zinc and their contribution towards availability and plant uptake of zinc under long -term maize -wheat cropping on an Inceptisol[ J]. Australian Journal of Soil Research ,2008, (2) :33 -38.
