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通过不同年限膜下滴灌棉田中播前、苗期、盛花期、收获期4个不同时期在1 m土层内水盐运移规律的田间试验资料分析。初步得出,相同年限棉田在4个不同的生育阶段各土层在播前土壤含水量较大,到苗期含水量减少,灌头水后含水量逐渐增大,到盛花期含水量达到最大,而后含水量又减少,到收获期含水量达到最小;含盐量的变化特征是相同年限棉田在播前含盐量很大,苗期含盐量降低,到盛花期含盐量升高,到收获期含盐量又降低;在相同的生育阶段,不同年限的棉田随着种植年限的增加盐分累积逐渐增加;30~60 cm深度是棉田盐分最大聚集区。
The field experiment data of water and salt migration in 1 m soil layer in four different periods before drip irrigation under different film mulching days were analyzed. The results showed that the soil moisture of all soil layers before sowing in the same age cotton field was greater in four different growing stages, the water content decreased to the seedling stage, the water content increased gradually after filling the water head, , And then reduce the water content to the harvest water content to a minimum; changes in salt content of the same age cotton fields before sowing salt content is large, seedling salt content decreased to full bloom flowering salt content, And the salt content decreased at the harvesting stage. During the same growth stage, the salt accumulation gradually increased with the increase of planting years in cotton fields of different years. The depth of 30-60 cm was the largest salinity of cotton fields.