覆盖能提高土壤水分含量1%左右，但主要体现在降雨月份上，在非降雨月份或少降雨月份覆盖效果不显著。
Grass covering raised the moisture of the soil nearly by 1%, which most reflected the month of precipitation, there was no difference of grass covering in the non-rainfall or less rainfall month.
随着土壤水分含量的提高，植株对矿质元素的吸收量显著提高。
With the improvement of the content of soil moisture, the mineral nutrition uptake amount improves notably.
大棚内麻地膜覆盖可显著增加土壤水分含量，增加土壤微生物数量，提高土壤养分。
It can remarkably enhance the soil water, boost the number of microorganisms, and elevate the soil nutrients as well.
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