配施的有机无机肥料氮在红壤性水稻土中的残留特征

（１５）Ｎ追踪结果显示，熟化上（Ａ）和低肥力土（Ｃ）有机、无机肥料配施的氮的残留特征均为随配施有机成分和土壤肥力水平的变化而变化．肥力制约残留水平，肥料氮总平衡影响残留率一利用率一损失率的关系；配施有机肥是造成氮残留差异的基本因素，相关分析表明，总残留主体为有机肥氮，残留率随有机肥Ｃ／Ｎ和木质素含量的增减而增减；影响无机肥氮残留的相关因素较复杂．有机氮残留量占总残留量的百分数与无视氮残留量占总残留量的百分数之比，在Ａ，Ｃ两种土壤中约为２．肥力对氮残留作用的实质是，肥料氮在低肥力土中具固持优势，而在熟化土中具矿化利用优势．肥力因素对无机氮残留的影响更显著．根据配施组合中有机成分Ｃ／Ｎ－木质素含量与氮残留／平衡特征的关系．将不同配施组合划分为三大类型。

Residual Character of Organic and Inorganic Nitrogen under Combined Application in Red Paddy Soil.

Results from the (15)N trace experiment indicated that in the mellow soil (A) and in the poor soil (C), the residual character of organic and inorganic nitrogen which were combined to apply Was that it changed with the combined organic components and soil fertility levels. Soil fertility restricted nitrogen residual level, and the total balance influenced the relationship of residual rate-utilization rate-loss rate. The combination with organic fertilizer was the basic factor inducing difference in nitrogen remaining. Correlation analysis showed that the nitrogen in organic fertilizer was the major part of the total residue, and the residual rate increased or decreased with the C/N ratio and lignin in organic fertilizer. The factors to influence nitrogen remaining of inorganic fertilizer was comparatively complex. The ratio of the organic nitrogen residual percentage to the inorganic nitrogen residual percentage in soil A and soil C was about 2. The essence of the effect of fertility on nitrogen remaining was that the immobilization of fertilizer nitrogen in the poor soil was stronger than its mineralization, and inversely, the mineralization and utilization of fertilizer nitrogen in mellow soil was stronger than its immobilization. soil fertility influenced the remaining of inorganic nitrogen more significantly. According to the C/N ratio, lignin, remaining and balancing,the different application combinations were classified into three types in this paper.