有机肥料磷素含量及C／P值与植物吸磷关系的研究

THE STUDIES OF RELATIONSHIP BETWEEN THE AMOUNT OF PHOSPHORUS AND C/P IN ORGANIC MANURE AND THE PHOSPHORUS ABSORBED BY CROP

用浸提法测定了有机肥料不同形态的磷素，并对其与植物吸磷量进行了相关分析，结果表明，有机肥料中的磷素以无机磷为主，有机态磷对植物磷素营养有一定的作用。有机肥料的有效磷应包括无机磷及活性有机磷。有机肥料的有机碳与有机磷的含量比（Ｃ／ＯＰ）与其有效磷的释放呈显著线性相关，与植物吸磷呈对数曲线相关，而其有机碳与全磷含量比（Ｃ／Ｐ）则没有这种相关关系。当Ｃ／ＯＰ值为２２０～２３０时，有机肥料开始净释放有效磷，而Ｃ／ＯＰ小于１５０时，植物才大量吸收有机肥料磷。

The soak method was used in determining the existing form of phosphorus in organic manure, the amound of phosphorus absorbed by crop was also studied, which was used as reference to the former. The result indicated that the major phosphorns in organic manure was inorganic phosphorus. The organic phosporus had effect to phosphorus nutrition of crop. The effective phosphorus in organic manure included inorganic phosphorus and active organic phosphorus.The relationship befween the C / OP (C was organic carbon, OP was organic phosphorus) of organic manure was line relation. The relationship between the C / OP of organic manure and the absorbed phosphorus by crop was curve relation.But the C / P (P was total phosphorus) was not thisrelation .When the C / OP was 220￣230, the effective phosphorus was net released in organic manure.When the C / OP was 150, the phosphorus in organic manure was absorbed greatly by crop.