摘要
水溶性磷肥施入土壤后，其有效性随时间延长而降低，短期内（２个月）有２／３左右变成不可提取态磷（Ｏｌｓｅｎ）法，其形态主要是Ｃａ８—Ｐ，Ａｌ—Ｐ，Ｆｅ—Ｐ型磷酸盐。在种植玉米时，施入的磷肥２２．６—２７．８％转化成Ｃａ２—Ｐ，２７．５—３０．６％转化成Ｃａ８—Ｐ，９．１—１０．０％转化成Ａｌ—Ｐ，１０．５—１５．６％转化成Ｆｅ—Ｐ，１１．３—１８．８％被玉米吸收利用。Ｃａ２—Ｐ、Ｃａ８—Ｐ、Ａｌ—Ｐ和Ｆｅ—Ｐ型磷酸盐对玉米生长都有一定的肥效，它们对植物干物质生产的效率（即引入每百毫克磷所产生的植株干重）的大小顺序是：Ｃａ２—Ｐ＞Ａｌ—Ｐ＞Ｃａ８—Ｐ＞Ｆｅ—Ｐ。Ｃａ（１０）—Ｐ型磷酸盐对玉米生长无效。
P availability of water-soluble phosphate fertilizer decreased with time in calcareous soil. During a short time (two months), about two thirds of fertilizer turned into inextractable phosphates with 0.5mol / L NaHCO3. The fractions of the phosphates were primarily Ca-P, Al-P and Fe-P. Under conditions of corn growth, 22.6-27.8% of fertilizer-p was transformed into Ca2-P, 27.5-30.6% into Ca8-P, 9.1-10.0% into Al-P,10.5-15.6% into Fe-P, while 11.3-18.8% was absorbed by the corn plants. Ca2-P, Ca8-P, Al-P and Fe-P phosphates in calcareous soil were available for corn. The DWPP (dry weight of corn plant produced by 100mg supplied phosphorus of the four phosphate-types) in a decreasing order: Ca2-P>Al-P>Ca8-P>Fe-P. Ca10-P phosphate was unavailable for corn.
出处
《土壤学报》
CAS
CSCD
北大核心
1996年第3期301-307,共7页
Acta Pedologica Sinica
基金
国家自然科学基金
新疆自然科学基金
关键词
石灰性土壤
水溶性磷肥
磷
形态
有效性变化
Calcareous soil, Water-soluble P-fertilizer, Fraction and availability changes,￣(32)P tracer
