风沙土酿酒葡萄基地磷素资源特征与生物有效性

应用化学分析、吸附试验和生物诊断方法 ,系统研究了风沙土磷的有效性和利用率。结果表明 ,土壤磷素活性高低的顺序为 :紧沙土>轻沙土>沙土 ,无机磷盐是风沙区植物所能利用的土壤磷素的主要磷形态 ,且Ca -P所占的比例最大。磷固定强弱的顺序为 :紧沙土>轻沙土>沙土 ,对各处理土壤进行无机磷形态分级测定表明 ,磷肥施入土壤以后 ,在相当长的时间里主要是向Ca2-P、Ca8-P转化 ,Al-P和Fe -P也有不同程度的积累。提高土壤有效磷含量主要靠增加化学磷肥用量和有机无机肥配合施用。

The Characters of Phosphorus Resource and its Bioavailability on the Soil Grown Wine-Grapes in Ningxia

The validity and availability of phosphorus in sandy soil was systematically studied using chemical analysis, bio－ adsorption test and biological diagnoses. The results showed that an order of vivacity of phosphorus increased together with texture, and inorganic－ phosphorus available for plants mainly in the sand soil, thereunto Ca－ P was major proportion. The sequence of phosphorus bound to soil was: tight－ sandy>light－ sandy>sandy. The result of determining inorganic－ phosphorus form in the soil showed that phosphorus mainly translates to Ca 2 － P、 Ca 8－ P、 Al－ P and Fe－ P during long－ time after the element was incorporated. It may be suggested that to increase the available phosphorus in soil, it is imperative to increase both phosphorus－ fertilizer and organism－ fertilizer together.