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通过土壤不同含盐量、土壤不同含盐量与含水量和土壤不同含盐量条件下覆膜种植对棉花出苗及苗期的影响进行了盆栽模拟试验。结果表明:土壤盐分含量不同,对棉花出苗有明显的影响,一般是随土壤含盐量的增加,棉花出苗率递减,棉苗生长也愈差;土壤含盐量对棉花的影响与土壤含水量有关,在适宜的含水量内,土壤含盐量相同时,棉花出苗率随土壤含水量的提高而递增。但在土壤含盐量超过一定限度时,土壤水分增加,并不提高棉花出苗率。土壤盐分相同,土壤含水量过低或过高,均不利于棉花出苗。土壤盐分对棉苗的危害,与土壤含水量也密切相关,一般是随土壤含水量的增加,棉苗受盐害减轻。盐碱土覆膜种植,可有效地提高棉花出苗率。但在土壤盐分含量超过一定范围后,即使覆膜种植,也难以出苗。在覆膜的情况下,棉苗生长发育均随土壤盐分含量增加而减弱。而在土壤盐分含量相同时,则比不覆膜的棉苗生育为优。
The effects of plastic film mulching on cotton emergence and seedling stage under different salinities of soil, different salinities of soil and water content and soil salinity under different salinities were simulated by pot experiments. The results showed that: different soil salinity, cotton seedling have a significant impact, generally with the increase of soil salinity, cotton seedling rate decreased, cotton seedling growth also worse; soil salinity on cotton and soil moisture content Related, within the appropriate moisture content, the same soil salt content, cotton emergence rate increased with the increase of soil moisture. However, soil salinity exceeds a certain limit, soil moisture increased, does not increase the emergence rate of cotton. The same soil salinity, soil moisture is too low or too high, are not conducive to cotton emergence. The harm of soil salinity to cotton seedlings is closely related to soil water content. Generally, with the increase of soil moisture content, cotton seedlings are reduced by salt damage. Salt-alkali soil cover film planting, which can effectively improve the cotton emergence rate. However, when the soil salt content exceeds a certain range, even if the film is planted, it is difficult to emerge. In the case of plastic film, cotton seedling growth and development with the increase of soil salt content weakened. When soil salinity was the same, the cotton seedlings were better than the non-covered ones.