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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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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Leaf N/ chlorophyll content and SPAD value increased with the increasing N fertilizer, and the lower leaves were more sensitive to the soil N supply than the upper leaves.

下位叶比上位叶对土壤氮的供应状况更为敏感，随着施氮量的增加，水稻叶片氮素含量、叶绿素含量、SPAD值相应的增加，而下位叶的增幅更明显。

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