The effects of Cu on rice at same level of N fertilizer were studied.
本文研究了微量元素铜在同样的氮肥量水平下对水稻生育的影响。
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The amount of fixed N during jointing—maturing stage was over 70% of whole rice growth stage.
拔节期—成熟期的固氮量占整个生育期固氮量的70％以上；
Rice is grown n China.
水稻生长在中国。
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