The N content of defoliation is decreased gradually at the seedling period and keeps steady after the bud period.

苗期落叶的磷含量逐渐降低，蕾薹期降至最低值，角果期后又略有升高。

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The N content of defoliation is decreased gradually at the seedling period and keeps steady after the bud period.

苗期落叶的磷含量逐渐降低，蕾薹期降至最低值，角果期后又略有升高。

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