Research On Water-salt Migration’s Characterization, Water Consuming Law, Yield And Quality Of Machine-picking Cotton Under Drip Irrigation With Film Mulch In South Xinjiang

The study has chosen southern cotton as the research object, studied the law of soil ofwater and salt migration,water consuming and irrigation system under the condition of dripirrigation of cotton picker machine by using evaporation as irrigation controlling index;analyzed the meteorological data, water content, soil salinity, yield and quality during cottongrowth period, concluded changing and water consuming law of water and salt of soil underthe condition of drip irrigation of cotton picker machine, developed the optimal irrigationsystem. The conclusions are as follows:(1) The water and salt changing law of soil under the condition of drip irrigation ofcotton picker machine: in terms of water, the water content of soil profile of0-100cm has alaw of first increased and then decreased along vertical,while has a trend of more closer todrip tape more water content along the horizontal direction; in terms of salt, soil electricalconductivity has a trend of first increased and then decreased with the passage of time; the saltcontent of soil profile of0-100cm has a trend of first decreased and then increased, while hasa trend of more closer to drip tape less soil content along the horizontal direction.(2) The effect of different irrigation quota on water and salt migration under thecondition of drip irrigation of cotton picker machine: in terms of water, the moisture of soilprofile of0-100cm had increased with the increasing amount of irrigation quota; moreirrigation quota more distinctly horizontal and vertical migration of water; in terms of salt,with the passage of time，the average soil conductivity had decreased with the increasingamount of irrigation; the salt content of soil profile of0-100cm had decreased with theincreasing amount of irrigation quota, while more irrigation quota more distinctly change insalt content before and after irrigation.(3) The effect of different irrigation frequency on water and salt transportation under thecondition of drip irrigation of cotton picker machine: in terms of water, the average soilmoisture of5d was higher than8d’s; in terms of salt content, the average soil salt of5d’sirrigation frequency was lower than8d’s; when the Kcp(crops-evaporation pan coefficient)is0.8, the whole soil profile has a better desalination under the condition of irrigation quotaprocessing, while Kcp(crops-evaporation pan coefficient)is0.6, the soil salt was mainlytransport to the bare land; there exists a phenomenon that the more irrigation the moredistinctly salt accumulation effect under8d’s irrigation frequency.(4) The water consuming law of cotton of different irrigation processing under thecondition of drip irrigation of cotton picker machine: water consumption intensity has a lawof first increased and then decreased, who will reaches a maximum in looming late; higher irrigation frequency had lead lower water consumption intensity, lower irrigation quota hadlead lower water consumption intensity; higher irrigation quota had lead lower waterconsumption mode coefficient.(5) Optimal irrigation frequency and irrigation quota of cotton under the condition ofdrip irrigation of cotton picker machine: By building southern cotton’s water productionfunction equation which had the independent variables of irrigation quota and waterconsumption, we had solved the equation to get the cotton’s optimal irrigation system ofadopting the combination of irrigation frequency of5d and Kcp=0.6.(6) The research on southern cotton’s quality under the condition of drip irrigation:different irrigation processing had certain extent impact, which was not very clear. We hadconcluded that quality of southern cotton is mainly determined by the varieties of cotton.