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研究了泡田洗盐与水稻生育期排水措施对苏打盐碱土种稻改良的影响。结果表明,前2次泡田洗盐后土壤脱盐率增幅较大,之后幅度减小并趋于稳定;洗盐2次后,土壤含盐量为0.25%、ESP为31.6%、pH值为8.5,达到盐碱土种稻的“淡化表层”建立标准。处理Ⅱ、处理Ⅲ的耕层含盐量均小于0.3%,产量分别是处理I的2.04倍和2.06倍;水分生产效率为处理Ⅱ>处理Ⅲ>处理Ⅰ。泡田排碱2次和水稻生育期内排水1次是提高水稻产量和节水的有效措施。
The effects of salt watering in soya field and drainage during rice growth stage on improvement of silage-saline-alkali soils were studied. The results showed that the soil desalination rate increased greatly in the first 2 soaking days and then decreased and stabilized. After 2 times salt washing, the soil salinity was 0.25%, ESP was 31.6% and pH was 8.5 , To reach the standard of salt-alkaline soil rice “desalination ”. The salt content of the topsoil in treatments Ⅱ and Ⅲ was less than 0.3% and the yields were 2.04 times and 2.06 times of treatments I respectively. The productivity of water was treatment Ⅱ> treatment Ⅲ> treatment Ⅰ. 2 times soaking in field and 1 time in rice growth period are effective measures to increase rice yield and water saving.