Evaluation of Soil Nutrient Content and Its Distribution of Cultivated Land in South of Xinjiang: Taking Aksu Prefecture as an Example
TIAN Liwen, QI Yongchun, DAI Lu, CUI Jianping, GUO Rensong, XU Haijiang, LIN Tao, ZHANG Na
To explore the soil nutrient content and distribution characteristics of cultivated land in south Xinjiang after years of cultivating since the second national land survey in 1982, the Aksu prefecture of xinjiang cotton producing area with typical natural ecological conditions in southern Xinjiang was taken as a representative in our research. Field investigation and laboratory analysis were used to measure the soil major element content of organic matter, total nitrogen, available nitrogen, available phosphorus, available potassium and microelement content of available copper, iron, zinc, manganese, then the determination results were analyzed by combining with relevant indices of soil nutrient grading in Xinjiang. The results showed that compared with 1982, soil nutrient content in the cultivated land was greatly improved. The average organic matter content of the whole region was 13.56 g·kg
-1; total nitrogen alkaline hydrolysis nitrogen, available phosphorus and available potassium were 680, 62.30, 13.90 and 145.00 mg·kg
-1, respectively. Among them, the organic matter content in Aksu Prefecture was the same as that of in 1982, while the available potassium content was decreased at rate of 2.20 mg·kg
-1 annually , and the content of available nitrogen and available phosphorus were higher 74.50% and 385.86% than that of in 1982, respectively. The overall result was as follows: that the content of phosphorus and potassium was abundant, the organic matter was in the middle level, except for the effective manganese content in the lower-middle level; the content of effective copper, available iron and zinc were in different degree of abundant state, and the content of nitrogen was low. In summary, it was recommended to strengthen the implementation of the balanced fertilization program for the current nutrient content levels and trends of soil, and to improve the content of soluble fertilizers such as nitrogen through reasonable irrigation, and prevent soil salinization. Thus, this research provided a theoretical basis for the future agricultural production of soil fertility and scientific fertilization in Aksu prefecture.