黄土高原地区土壤中磷的状态和磷肥投放方案刍议

A Primary Study on Phosphorus Situation in Soil and the Plan of Phosphorus Fertilizer Application in Loess Plateau Region

该文研究了黄土高原地区土壤磷库中的活性磷,并拟定了两个指标:(1)土壤磷活化度,(2)土壤供磷势。该指标比单用土壤有效磷更能反映土壤的供磷能力。依此两个指标,参考田间试验把黄土高原地区分为六级供磷区。并根据拟定的磷肥施用综合指标,把黄土高原地区分为三个区,6个亚区和9个单元。提出磷肥投放重点在黄土高原的中南部地区,或第三区第一亚区。

The labile phosphorus of soil phosphorus storehouse in Loess Plateau region was studied, and two indexes was provided as follows: (l)the active degree of soil phosphorus, (2)the supplying potential of soil phosphorus. It can better reflect the supplying capacity of soil phosphorus than soil available phosphorus. On the basis of the two indexes,and consulting the field experiment,the Loess Plateau region was dvided into six phosphorus supplying areas. Then according to drawing up comprehensive indexes of phosphorus fertilizer application, the Loess Plateau region was divided into there areas and nine units. Finally,it was suggested that the main positions of phosphorus fertilizer application were the first sub-area of third area,or the middle-south area of Loess Plateau.