论文部分内容阅读
土壤中的磷,其中只有小部分能为植物直接利用,一般统称为土壤有效磷,土壤有效磷的多少与施用磷肥效果有密切关系.用化学方法测定的土壤“有效磷”,不是作物吸收利用的绝对数量,但测得的数据能够相对地说明作物生长的影响及施用磷肥效果的关系.实践证明,根据化学方法测定土壤有效磷的分级指标,按土施用磷肥是比较方便的,是生产上可以广泛采用的方法,辽宁省大部分地区属于中性土壤,对这类土壤测定有效磷的化学方法目前极不统一.我们于所内并结合省化肥网田间试验,对中性土壤的测定方法及土壤有效磷的分级指标进行了初步研究.
Soil phosphorus, of which only a small part of the direct use of plants, generally referred to as soil available phosphorus, the amount of soil available phosphorus and the application of phosphate fertilizer are closely related.Chemical determination of soil “available phosphorus”, not the crop absorption and utilization However, the measured data can relatively explain the effect of crop growth and the relationship between the effect of P application.Practice has proved that, according to the chemical method to determine the soil P classification index, soil phosphate fertilizer is more convenient, is the production A widely available method, most of Liaoning Province is neutral soil, chemical methods for the determination of available phosphorus in this type of soil is currently very heterogeneous. We are in the province and combined with fertilizer field test, the determination of neutral soil and Soil phosphorus content of the grading index for a preliminary study.