5, long-term application, loosen the soil porosity, reduce soil compaction, increase soil fertilizer conservation, water retention.
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长期施用，可补充土壤中有机质，且肥料中重金属元素不会引起菜地环境的污染。
Long term application of the fertilizer will supplement the soil with organic matter and the heavy metals in the fertilizer wil not pollute the soil environment.
地下水在补给过程中受到长期施用化肥影响而引起水质的变化已越来越受到人们的重视。
More and more people have been aware of groundwater quality change under the long-term utilization of chemical fertilizer in the recharge process.
结果表明，长期施用有机肥或化肥均能增加土壤生物量氮数量，尤以有机肥的作用明显。
Results showed that long term application of NPK fertilizers or manure could increase soil biomass-N, especially the effect of manure on biomass-N was obvious.
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