Study on the Relationship between Yield Formation and Water Use Efficiency of Cotton by Mulched Drip Irrigation in Xinjiang

Three irrigation treatments in field experiment, the treatment of L(330mm), the treatment of M(390mm) and the treatment of H(450mm) were adopted in cotton cultivation under mulched drip irrigation in Xinjiang, we studied the relationship between cotton yield formation traits and water use efficiency(WUE), the results showed that: WUE is low and cotton growth unhealthy under the treatment of L and H, it reduced the number of buds and increased the shedding rate of buds and bolls, the number of available bolls and single boll weight were all reduced, thus led to yield declined. While cotton growing vigorous under the treatment of M, the plant height is suitable, stem is thick, also buds and bolls of bottom cotton growing better, these reduced the shedding rate of buds and bolls. WUE comes to 1.47kg/m(3), yield is increased by 8.6% and 3.9% compared to the treatments of L and H.