| Drip irrigation under mulch is the combination of advanced agricultural culture measurement with water-saving technology.The study aims at researching water consumption regulationion and crop evaparation under regulated deficit and mechanism of water-saving and high -yield of crop of drip irrigation under mulch .The test about drip irrigation under mulch was carried out at 121Tuan Pao Tai soil- improving station of Xin Jiang in 4-9.2000. Soil water content before irrigation and after irrigation was observed by adopting the method of borrowing and drying during the test.The position of crop growth including vegetation height,root length,stem coarseness,number of flower and blossom and bolling,volumn of humid zone after irrigation twenty -four hours ,final product of different treatment were all observed simultaneously.According to the statistic and analyst of data measured, the regulation of humid zone under different drip flow is got,the horizontal and vertical length will augment with drip flow increasing,but the ratio to horizontal length and vertical length will decrease. The growth and product of crop are associated with soil water content The article analysises the dynamic variation of soil water in scheduling wetting zone of different treatment and the effect on crop growth and product .Generally,the flat curve of soil water content dynamic variation is benefical to crop final yield .As is known to us, quantity of water consumption and intensity of water consumption per day and moduse of water consumption are the important references to instituting irrigation schedule.Based on the result of test ,water consumption of cotton in different reproduce stage is 43.02-54.34mm during the period of seed ,61.2-99.65mm during the period of bloosm,108.34-135.45mm during the early period of flower and bolling,91.87-142.27mm during the late period of flower and bolling.Crop serve as a systemtic integration,the coordinate relationship among organs has great influence on crop yield,resarch show that the relationship between plant height or leaf area and the whole quantity of life is quadratic parabolic.what is more,the relationship between root length and plant height is power function.The weight of dry bolling increase with root weight increasing,but it will decrease as root weight reach some value.Optimistic irrgation style is arrived at by analysising different water treatment affect crop growth and yield,that is,normal irrigation is adopted during the period of seed, one day and half of day and one day individually are set back during the period of bossom and early period of flower and bolling and late period of flower and bolling,all this is helping to high-yield.Based on normal irrigation,two days are set back during the period of seed ,normal irrigation is adopted during the period of bloosm,half of day and one day are set back during the early period of flower and bolling and the late period of flower and bolling ,which make yield of the treatment reach the highest.Aftering analysising the relationship between yield of drip irrigation under mulch or water utilization efficiency(WUE) and water consumption quantity in the whole period measured,the ET corresponding to the highest point of WUE is 338mm,whereas that of yield is 400mm,Based on the modle of Jensen ,the optimistic irrigation style is got by adopting the method of dynamistic planning,the article researching the method of canopy temperature in diagnosising water deficit of crop ,moreover ,the CWSI and Ta - Tc variation per day of cotton of drip irrigation under mulch on the condition of different water treatment are measured ,multivariate linear regression relation among CWSI and Rn and VPD and soil water content and Ta - Tc is fit. Drip irrigation under mulch is a cultivation style and irrigation which is water-saving and high-yield ,but great difficulty is met during generalization in vast area ,because primary investment and fee of running are too high .In order to decrease investment ,the research of different arrangement of capi... |
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