【水稻叶色诊断氮肥施用的研究】.pdf

施氮能促进早晚稻分菜盛期、幼稳分化期的氮素代谢与光合作用。早稻分盛期的C/Ncr比值有随施氮量增加而逐渐下降至某一值,继而逐渐上升的趋势磷钉肥能加速低氮区C/Dr比值的降低,延缓高氮区的升高。氮肥能降低早稻幼穗分化期的C/Ncr 比值磷钾肥在低肥力土壤低氮区上具削弱作用。晚稻各期CNcr 比值同样受氮肥影响,不同的是磷钾肥影响较小。在分盛期氮肥有促进高磷区晚稻光合作用,从而使C/Mcr比值上升之效果,但其程度不及早稻。幼稳分化期C/NCr比值随施氮量增加而降低,只是磷印肥对促进高氮区的氮亲代谢作用较早稻明显,灌浆期的C/Ncr比值随氮肥水平提高而急剧下降,表现为氮素代谢加强,延

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