Effect of Regulation of Water and Nitrogen on Cotton Yield and Water Use Efficiency under Different Furrow Irrigation Patterns

By setting the alternative furrow irrigation,conventional furrow irrigation,and fixed every-other furrow irrigation,the amount of nitrogen and irrigation design using two general rotation experiment conducted to study the regulation effect of water and nitrogen on cotton yield and water use efficiency.The results showed that: cotton yield was significantly positively correlative,with nitrogen applied amount in the range of 56.2 ~ 95.2 kg·hm-2,and same as cotton yield and water within 37.52 ~ 160.00 mm;Cotton yield was not significant different under the same water and nitrogen treatments between alternative furrow irrigation and conventional furrow irrigation,cotton yield of conventional furrow irrigation was higher on average than the fixed every-other furrow irrigation by 9.15%.Cotton water use efficiency and nitrogen within 56.2 ~ 122.8 kg·hm-2 was a significant positive correlation,and was significantly negatively correlated with irrigation within 37.52 ~160.00 mm.Cotton water use efficiency was no significant difference under the same water and nitrogen treatments between conventional furrow irrigation and alternative furrow irrigation,and conventional furrow irrigation was higher on average than the fixed every-other furrow irrigation in cotton water use efficiency by 9.01%.Therefore,alternative furrow irrigation can increase the cotton yield and water use efficiency.