Xinjiang has a typical temperate continental arid climate with complex types of landforms. Although the total land area in Xinjiang is very large, the available soil resources that can be effectively used for development are very good. The area of ​​cultivated land accounts for 24% of the total area, so the rational use of cultivated land resources is Necessary measures for the development of Xinjiang's agriculture. Soil nutrients are one of the most important signs of arable land. After the second national census of the soil, it has been cultivated for more than 20 years. How the change in soil nutrients has guiding significance in agricultural production. According to conditions of landforms, soils, climate and other factors, and referring to administrative boundaries, the study is divided into seven geographical regions: (1} Dongqin; (2) Longnan District, Southern Junggar Basin); (3) Northern Junggar Basin Yubei District); (4) Yili District; (5) Gebei District in the northern part of the Tarim Basin; (6) Gexi District in the west of the Tarim Basin); (7) South Area, Southern Region, Tarim Basin). Using soil NPK detector can effectively analyze the specific soil nutrients in Xinjiang.
Soil total nitrogen is the sum of various forms of nitrogen in the soil, which can represent the soil nitrogen supply to a certain extent '82, and its content is positively correlated with the change of organic matter content. The soil total nitrogen content is relatively stable, and its growth and decline depend on the accumulation and consumption of nitrogen. It depends on the relative strength of the organic accumulation and decomposition of organic matter in the soil. The results of the soil N, P and K detectors showed that the soil total nitrogen content had a slight downward trend, and the average value of the whole country decreased from Q83g/fig to Q81g/k. This was in line with the reduction in the area and amount of organic fertilizer used in the past decade or so. , The drastic reduction in the area of ​​green manure, and the relative simplification of large-scale crops. In terms of spatial distribution, the regional content of total nitrogen content is very different, and the content in most areas decreases, and the total nitrogen content in Yubei and Yili areas in some areas rises. The total nitrogen content in Yili and Qunbei areas is the highest, which is L63g/L. Kg and L16g/fig; Talan District, the lowest, only Q47g/k.
The content of available phosphorus in cultivated land in different regions of Xinjiang has increased significantly. The largest increase is in the Yili region, which has increased by nearly threefold from 10 mg/kg to 2845 mg. On the spatial scale, the Yili area has the highest available phosphorus content, and the eastern Xinjiang has the lowest available phosphorus content, which is only 1184mg/k. Water soluble potassium in soil and exchangeable potassium in soil are called soil available potassium. The soil available potassium content is a realistic indicator of soil potassium nutrient supply capacity, which indicates the current and near-term availability of potassium for plant absorption67.
The content of available potassium in the cultivated land of the entire Xinjiang showed a decreasing trend. The average value decreased from 19,865 mg/kg in the early 1980s to 17056 mg/kg in the southern part of the Lunong district in individual areas, which is related to the accuracy of the data. In terms of spatial variation, the content of available potassium was the highest in the Yili area (28,395 mg/k}), which was the lowest in the eastern Xinjiang, only 10,437 mg/k. The content of available potassium in cultivated land of the whole Xinjiang shows a decreasing trend, which is reflected in specific soil types. The most significant declines were in irrigated grey desert soil, forested meadow soil and saline soil. During the general survey of the soil, saline soil had the highest available potassium content, with an average of 473 mg/kg. The content of irrigated brown desert soil was the lowest, only 183 mg Zhonghuan The current seven soil available potassium content from high to low was: fluvo-aquic soil (244 mg /kg)>Salt soil>Irrigation and siltation soil>Importing brown-brown soil>Irrigated brown desert soil>Irrigate grey desert soil>Forest irrigation meadow soil (110mg/kg).
Compared with the result of the second census, the soil NPK determination by Xinjiang soil NPK instrument was found to be significant. After more than 20 years of cultivation, the soil fertility of Xinjiang's arable land has changed significantly. First of all, the content of available phosphorus and alkali-hydrolyzed nitrogen in the entire cultivated land showed an increasing trend, among which the increase of available phosphorus was the largest; the total nitrogen decreased slightly, and the content of available potassium decreased significantly. Changes in soil fertility are affected by both natural and human factors. Changes in human fertilization, farming practices, and land-use changes will have an impact on the trend of changes in arable land fertility.
Soil total nitrogen is the sum of various forms of nitrogen in the soil, which can represent the soil nitrogen supply to a certain extent '82, and its content is positively correlated with the change of organic matter content. The soil total nitrogen content is relatively stable, and its growth and decline depend on the accumulation and consumption of nitrogen. It depends on the relative strength of the organic accumulation and decomposition of organic matter in the soil. The results of the soil N, P and K detectors showed that the soil total nitrogen content had a slight downward trend, and the average value of the whole country decreased from Q83g/fig to Q81g/k. This was in line with the reduction in the area and amount of organic fertilizer used in the past decade or so. , The drastic reduction in the area of ​​green manure, and the relative simplification of large-scale crops. In terms of spatial distribution, the regional content of total nitrogen content is very different, and the content in most areas decreases, and the total nitrogen content in Yubei and Yili areas in some areas rises. The total nitrogen content in Yili and Qunbei areas is the highest, which is L63g/L. Kg and L16g/fig; Talan District, the lowest, only Q47g/k.
The content of available phosphorus in cultivated land in different regions of Xinjiang has increased significantly. The largest increase is in the Yili region, which has increased by nearly threefold from 10 mg/kg to 2845 mg. On the spatial scale, the Yili area has the highest available phosphorus content, and the eastern Xinjiang has the lowest available phosphorus content, which is only 1184mg/k. Water soluble potassium in soil and exchangeable potassium in soil are called soil available potassium. The soil available potassium content is a realistic indicator of soil potassium nutrient supply capacity, which indicates the current and near-term availability of potassium for plant absorption67.
The content of available potassium in the cultivated land of the entire Xinjiang showed a decreasing trend. The average value decreased from 19,865 mg/kg in the early 1980s to 17056 mg/kg in the southern part of the Lunong district in individual areas, which is related to the accuracy of the data. In terms of spatial variation, the content of available potassium was the highest in the Yili area (28,395 mg/k}), which was the lowest in the eastern Xinjiang, only 10,437 mg/k. The content of available potassium in cultivated land of the whole Xinjiang shows a decreasing trend, which is reflected in specific soil types. The most significant declines were in irrigated grey desert soil, forested meadow soil and saline soil. During the general survey of the soil, saline soil had the highest available potassium content, with an average of 473 mg/kg. The content of irrigated brown desert soil was the lowest, only 183 mg Zhonghuan The current seven soil available potassium content from high to low was: fluvo-aquic soil (244 mg /kg)>Salt soil>Irrigation and siltation soil>Importing brown-brown soil>Irrigated brown desert soil>Irrigate grey desert soil>Forest irrigation meadow soil (110mg/kg).
Compared with the result of the second census, the soil NPK determination by Xinjiang soil NPK instrument was found to be significant. After more than 20 years of cultivation, the soil fertility of Xinjiang's arable land has changed significantly. First of all, the content of available phosphorus and alkali-hydrolyzed nitrogen in the entire cultivated land showed an increasing trend, among which the increase of available phosphorus was the largest; the total nitrogen decreased slightly, and the content of available potassium decreased significantly. Changes in soil fertility are affected by both natural and human factors. Changes in human fertilization, farming practices, and land-use changes will have an impact on the trend of changes in arable land fertility.
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