碳,氮比对有机肥料氮素释放和植物吸氮的影响

有机肥料中的碳含量与氮释放关系很大，不同方法测定的Ｃ，Ｎ及其组成的Ｃ／Ｎ比与氮素释放和植物吸收氮的关系不同。有机肥料的全碳及碳氮联合测定的氮素之比和氮素矿化率成直线关系，和植物吸收氮素成幂函数相关。在Ｃ／Ｎ比低于１７￣２１时，有机肥料开始释放无机氮，在Ｃ／Ｎ比小于１４时，植物才能大量吸收有机有肥料中的氮素。

Effects of C/N on the Release of Nitrogen from Organic Manures and of Nitrogen Absorbed by Plant

There was a significant correlation between the carbon content and nitrogen release in organec manures. The correlation between c .N and C/N, and N release and plant uptake varied with the determination methods. There was linear correlation between the ratio of total carbon to nitrogen, and nitrogen minerl ization tate, when both C and N were delermined simultaneously. The nitrogen absorbed by plant was exponentially correlated to C/N ratio. The inorganic nitrogen in organic manures began to re lease if the C/N was less than 17~21. The plant began to absorb nitrogen in a large amount if the C/Nwas less than 14.