长期棉麦轮作下石灰性土壤无机磷形态转化及有效性研究

Forms Transformation of Inorganic P and Its Availability in Calcareous Soil under Long term Cotton barley Rotation

１９８４年和１９９３年对棉花－大麦轮作下的土壤进行无机磷分级测定以及土壤磷减少量与作物产量、吸磷量的通径分析，研究了施用磷肥、有机肥等对石灰性土壤无机磷形态转化及其有效性的影响。结果表明，施用磷肥大大提高了土壤中Ｃａ２－Ｐ、Ｃａ８－Ｐ、Ａｌ－Ｐ和Ｆｅ－Ｐ含量，有机肥与磷肥配合施用有利于土壤无机磷的积累，对增加Ｏ－Ｐ也有一定作用。在土壤无机磷长期处于耗竭状态下，其各组分对作物总产量。

The fractional determination of inorganic P in the cotton barley rotational soil with permanent experiment of fertilizer was conducted in 1984 and 1993. The path coefficient of phosphate decrease in the soil to total crop yield and phosphate intake was analysed to study the effects of phosphatic and organic fertilizer application on the form transformation and availability of inorganic P in calcareous soils. The results indicated that application of phosphatic fertilizer increased Ca 2 P,Ca 8 P,Al P and Fe P greatly. The application of organic and phosphatic fertilizer also promoted the accumulation of inorganic P as well as O P. As the inorganic P was exhausted by cotton and barley, the direct responses of soil inorganic P forms to total crop yield and P intake ranged in the following order:Ca 2 P>Ca 8 P>O P>Al P>Fe P