桓台县麦玉两熟系统化肥投入及土壤养分资源研究 关键词 麦玉两熟系统 化肥投入 土壤养分资源 [gap=1253]Key words Winter wheat—corn rotation system，Fertilizer input，So~l nutrient resources
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化肥投入对于我们这个人口负担重，而经济又欠发达的国家来说尤为重要。
Fertilizer input for this heavy burden on the population and the economy of less developed countries is particularly important.
目前，我们正在非常迅速地失去我们的地下水、破坏土壤养分，而农民们正在欠债，因为他们依赖于化肥和其它投入。
At the moment we are losing our groundwater very quickly, destroying soil nutrients, and farmers are going into debt because they are dependent on fertiliser and other inputs.
导致这一现象的原因部分是因为化肥等方面的投入减少以及耕种方式的改变。
This was caused partly by a reduction in inputs such as fertilizer and changes in farming practices.
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