The maximum nitrification ratio of fertilizer N in soil is up to 20%-42%, according to the soil fertility and rate of fertilizer N applied.

氮肥中N在土壤中的净硝化率最高达42％，因土壤肥力和施N量不同而异。

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There was very little fertilizer N residue left, most of which entered the organo-mineral complex, while a part of the soil N was activated.

化肥氮残留很少，大部分进入土壤有机无机复合体中，而部分土壤氮被活化。

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The results showed that the efficiency of fertilizer N used by wheat increased and a higher percentage of N absorbed was translocated into grain under the interplanting condition.

结果表明，麦棉套作条件下，小麦对肥料氮的吸收和利用率显著提高，且所吸收的氮素较多地分配到籽粒中。

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On the whole, only 3.5% of Africa's arable land is irrigated and about 9% of world fertilizer is used in the continent, according to the U.N.

CNN: Agriculture must play 'critical role' in Africa's future