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。
Therefore, the objective of theis study was to evaluate these three different chlorophyll meter-based approaches for diagnosing N status of summer maize.
因而，这次研讨的主要目的就是，经过三种不同的办法运用叶绿素丈量仪就夏天玉米的含氮量停止研讨。
Without N fertilizer for years, it will strain synthesis of chlorophyll in maize leaf, and it will go against the synthesise of organic matter. N fertilizer is in favor of the widening o…
长期不施用氮肥会使玉米叶片内叶绿素的形成受到限制，不利于有机物质的合成；
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