植物叶片的颜色常作为（ ）肥是否充足的指标。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='29830' and id < 2421039 and id<>'2421039' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='29830' and id > 2421039 and id<>'2421039' order by id asc limit 5