小麦生长全程覆盖地膜有明显的防返盐作用，但产量降低。
If the soil was mulched for the whole growth period of wheat salinization would be controlled but the yield of wheat would decline.
小麦生长全程覆盖地膜有明显的防返盐作用，但产量降低。
If the soil was mulched for the whole growth period of wheat salinization would be controlled but the yield of wheat would decline.
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