种与不种作物，土壤矿质氮都处在不断变化之中。
The mineral nitrogen in soil was greatly changed no matter whether wheat was planted or not.
灌水对土壤矿质氮、有机质和全氮含量无显著影响，但有利于土壤有机氮的矿化。
Also, irrigation had no obvious effect on the contents of mineral n, organic matter and total n, but it was beneficial to the mineralization of organic n.
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