Effect of spring irrigation quota on water temperature and salt distribution in cotton fields and seedling growth of cotton
[Objective]To study the effects of different spring irrigation quotas on water temperature and salinity in cotton fields and seedling growth of cotton in Xiaohaizi Irrigation District.Provide a certain scientific basis for the reasonable spring irrigation quotas in the southern Xinjiang.[Methods]Three water treatments(W1:1,350 m3/hm2,W2:1,800 m3/hm2,W3:2,250m3/hm2)were set up for spring irrigation to analyze the effects of different spring irrigation quotas on water temperature and salinity of cotton fields and cotton seedling growth.[Results]The average soil water content in the 0-60 cm soil layer of the W3 treatment was higher than those of the W1 and W2 treatments,and the water retention capacity of the upper tillage layer was bet-ter.The W3 treatment had a lower ground temperature at different depths than those of the W1 and W2 treat-ments,and the ground temperatures between the rows were higher than those between the membranes.The salt content in the surface layer of W1 treatment was lower than those of W2 and W3 treatments,and the salt wash-ing rate of 0-50 cm was6.77%,22.22%and30.03%,respectively,and the larger the amount of spring ir-rigation water,the better the effect of salt washing,and the average salt accumulation rate of 50-100 cm was-39.89%,-58.95%and-68.91%,respectively,which indicated that with the increase of irrigation wa-ter,the salts were carried by the water into the deeper layer and increased.The height,stem thickness and leaf area of cotton seedlings in the W1 treatment were the largest,and a certain degree of water deficit was favorable to the growth of cotton seedlings.[Conclusion]Different spring irrigation quotas have a certain degree of salt washing and moisture increase effect,manifested as W3>W2>W1 treatment.
spring irrigationsoil moisturesoil salinitysoil temperaturesalt leachingcotton fields
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