Influence of Different Quantities under Drip Irrigation Mode on the Long-staple Cotton Growth and Yield

[Objective]The program was to nail down the quantity of water under the drip irrigation on Avati County's long - staple cotton fields for maximum yield production with the purpose of providing theoretical basis for a compete set of long - staple cotton cultivation techniques of drip irrigation and the rational application of water.[Method]In the high fertility cotton fields in our country' s leading producing area,that is,Avati County,Xinhai 24 was chosen and 6 different irrigation treatments in growth period were set to research the influence of different quantities of drip irrigation on the cotton growth and yield.[Result] (1) After the first water,with the increased amount of drip irrigation,the long - staple cotton growth process was deferred;(2) During the same period,drip irrigation amount of different processing disease - resistant g. barbadense plants leaf area index(LAI) and drip irrigation amount were positively correlated.Flowering boll period for processing was the maximum,and then began to decline.The drop rate became slower with the increased amount of drip irrigation;(3 ) The accumulation of dry matter yield by the different treatment of drip irrigation showed a logistic growth curve.The accumulation of rate of economic yield rapid accumulation phase of(ΔV) and the time of appearance(T) are different;(4) Through the analysis of the production and the form factors,the test for W4 treatment was the highest irrigation water for the maximum yield.[Conclusion] The regression equation of different quantity of drip irrigation and long - staple cotton seed cotton yield was a open -down parabola:Y = - 762.571 4 + 8.828 6 X - 0.017 143 X~2(R~2 = 0.958 2~(* *));After the calculation;when drip irrigation amount X=257.5 m~3/667 m~2,long -staple cotton seed cotton yield reached the maximum;374.1 kg/667 m~2.In this study,when pure nitrogen 20 kg was applied in the high fertility drip irrigation field,among which 80%was used with water,the seed cotton yield by the 6 irrigation treatments revealed a significant difference.Drip irrigation capacity of 240 m~3/667 m~2(W_4)is the irrigation water for long -staple cotton maximum yield production.