Evolution Features Of Soil Phosphorus Nutrient And Phosphate Fertilizer Recommendation In Yongdong District

Phosphorus is one of the indispensable nutrients that plants need, similarly, the key factor to decrease the production of plants in acid soil regions of southern parts of China. As one of the most effective nutritious chemical elements in reservoir of soil phosphorus, AP (Available Phosphorus) could be directly absorbed and utilized by crops, as a result, it is widely accepted that AP is a significant indicator to make an evaluation upon the capability of soil to supply phosphorus. This paper is based on the evaluation project of soil testing and fertilizing as well as soil fertility in cultivated lands of Yong Ding District, Zhang Jiajie. According to the evaluation research and experience accumulation concerning on AP in domestic and abroad and combining with some relevant theories such as Edaphology (Soil Science), Plant Nutrition and Fertilizer Application etc., a research on characteristic of contents and rules of spatial distribution in Yong Ding District, Zhang Jiajie was conducted. Meanwhile, there was also a recommended fertilization design on rice offered so as to provide a theoretical foundation for the management of soil phosphorus and decision-making on soil fertilization in Yong Ding. The research outcomes were as followed,(1) The total amount of AP in farmed land in Yong Ding District can be grated to level 3, amounting to 20.04mg/kg at average, still, showing quite an uneven sign on spatial distribution, and the distribution area of AP within Level-3 and Level-4 took up larger area while Level-1 and Level-5 accounted for smaller.(2) The quantity of AP in paddy soil in Yong Ding cultivated land was higher than that of dry land by 2.65mg/kg, which had the highest proportion of 20.86mg/kg within level-3 among distinct sorts of soils while the AP in purple soil accounted for the smallest amount at 10.05mg/kg, which could be grated to lower level. Besides, the number of AP in other soils was between 10-20mg/kg, which could be grated to Level-4.(3) The area of farmed land with high stable yield in Yong Ding was 112,090Mu,137,236 mu of medium yield and 94,294 mu of inferior yield, since phosphorus is one of the crucial factors which could inhibit crops from gaining in yield, the area of cultivated land with medium and high stable yield took larger proportion. It could be calculated on the basis of field experimental results that the farmed land would absorb P2O5 within 0.85-0.92kg to produce 100kg rice, therefore, according to the soil nutritional features of homogeneous farmed lands and target yield, the amount of phosphorus application should be P2O5 within 2.05-4.29kg.