Two groups of corn plants were grown under laboratory conditions.Humus was added to the soil of one group and the other group without humus served as the control. The leaves of group were yellowish than the group in humus-enriched soil. what best explains the observation?

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2015-09-14T14:23:37+08:00

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It is because humus, when added to plants results to the breakdown of the plant material, this is called humification. 
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