Abstract:
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Objective 】To investigate the effects of dry sowing and wet emergence on water and salt distribution, nutrients and cotton yield in different salinized soils.【
Methods 】Three cotton fields with light, moderate and severe salinity degrees were selected to dynamically monitor the water and salt changes in different locations of the seed holes, wide rows and membranes within 30 days of the seedling emergence water drips, and the cotton growth indexes, indicators of soil nutrients, salinity, pH content, etc., and the yields were analyzed during the critical period of growth and development.【
Results 】The overall trend of soil volumetric water content, seed hole soil conductivity and soil salinity was: heavy > medium > light cotton field, 0-20 cm soil layer of light, medium and heavy cotton field soil salinity between the membrane was generally greater than the seed holes and the wide rows; light and medium cotton field soil quick-acting nutrient content of 0-20 cm > 20-40 cm, soil alkaline dissolved nitrogen and quick-acting potassium content of the seed holes of the heavy cotton field showed an opposite trend; The soil pH of heavy cotton fields was basically below 8, and light cotton fields were above 8; the highest seedling emergence rate of light cotton fields was 83.4%, which increased by 4.51%, 5.44% and 6.59% compared with light (conventional), medium and heavy cotton fields respectively; the highest seed cotton yield of medium cotton fields was 513.5 kg/667m
2, which increased by 0.51%, 37.0% and 15.0% compared with light, light (conventional) and heavy cotton fields respectively.【
Conclusion 】There is no obvious difference in cotton field emergence rates of different saline-alkali levels, but the high moisture content of soil volume is not conducive to cotton emergence. The moderate cotton field seed yield is the highest. The soil salt below 4 g/kg has little impact on seed germination and cotton seedling growth, but the salt content above 6g/kg will affect the yield of seed cotton.