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水稻的根和叶是相互关联的,它们之间存在着相互依存又相互促进的关系。根多而活力强,才能使植株保持较多的活叶,受光充足,增强叶绿体的同化能力;反过来,稻株底部叶片不枯不衰,上部叶片生长繁茂,才能制造充足的养分供根系生长,并使根系有足够的吸水吸肥的能量。特别是水稻生育后期,根、叶向衰老转化,此时稻田的管理中心应是上保叶、下保根,力争达到“活根到老,老而不衰,叶绿秆活,直到黄熟”。
The roots and leaves of rice are interdependent and exist in an interdependent and mutually reinforcing relationship. Root and more vitality, in order to make the plant to maintain more live leaves, adequate light, enhance the assimilation capacity of chloroplasts; conversely, the bottom leaves of the rice plant withered, the upper leaves of the lush growth in order to create adequate nutrients for root growth , And make the root have enough water absorption of fat absorption of energy. Especially at the later stage of rice growth, roots and leaves turn to senescence. At this time, the management center of paddy fields should be the upper leaves and the lower leaves, and strive to achieve the goal of “living root to old, old and not bad, leaf green stem alive until yellow ripening” .