The quantity of crop nutrients transferred from the system, and the nutrient budget of N, P and K in soil were studied.

研究了在养分循环再利用的基础上采取不同施肥制度下作物养分移出量，并结合施肥量计算出土壤中N、P、K养分收支。

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The relationship between mineralizable soil N and crop N uptake was studied under the condition of pot and field experoments respectively.

在盆栽和田间条件下，研究了作物吸氮与土壤可矿化氮的关系。

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Soil microbial biomass N also involved in nitrogen supply to crop.

土壤中微生物氮也参与了对作物的供氮过程。

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For example, in the island nation of Papua New Guinea, an increase in population growth coupled with rising sea levels is decreasing the amount of crop land making farming very difficult for the indigenous people of the region, according to the U.N.

CNN: 'Climate change' forces Eskimos to abandon village