Agricultural development can not be separated from the soil. This is an important foundation and support for it. However, unreasonable use of land has always existed during the long-term agricultural production process. This has adversely affected the development of agriculture and seriously affected the availability of agriculture. With continuous development, soil science is also faced with arduous tasks and challenges. The southwestern China has complex terrain, large climate changes, and numerous species, rich in resources such as animals, plants, water, minerals, and energy. The types of soil are numerous, resulting in a diversity of agriculture. Superior natural conditions have brought natural advantages to the development of regional agriculture and characteristic agriculture. On the other hand, some harsh and fragile environmental conditions have severely restricted local agricultural and economic development. Therefore, the relationship between the development of soil science in the region and the sustainable development of agriculture appears to be closer and more important than anywhere else. Soil nutrients have very important research significance in soil science. Therefore, in order to promote the sustainable development of agriculture, it is necessary to use soil testers and a series of soil instruments for effective measurement and analysis, so as to provide scientifically favorable basis for soil improvement.
Through soil tester test analysis, the nutrient status in the soil is always in a dynamic change due to factors such as precipitation and irrigation leaching, plant absorption, fertilization, mineralization of organic matter, adsorption and fixation, and redox. Under certain climatic conditions, fixed planting patterns and unreasonable fertilization accelerate the depletion of certain nutrients in the soil, and also lead to the accumulation of long-term excess nutrients. The study of soil nutrients of available phosphorus, potassium, zinc, and boron in Southwest China shows that soil nutrients have undergone significant changes in less than 20 years. The changes in the nutrient status of cultivated soils represented by vegetable plots in the same region are different from those in cultivated soils of food crops. Phosphorus in vegetable soils has accumulated obviously, and the depletion of potassium seems to be more serious. It is the result of long-term large-scale application of nitrogen and phosphorus fertilizers to vegetables.
The soil tester determined the nitrogenous elements in the soil and found that due to the large amount of nitrogen fertilizer application in recent years, the nitrate pollution in groundwater was caused. The places where the content of nitrates in the groundwater in the southwest exceeds the standard are mainly suburban areas with high production levels and fertilizing amount, high value-added economic crop cultivation areas, large-scale farms, and nitrogen fertilizer plants, and are mostly distributed in plains and valleys. For this reason, the application of the soil tester provides a data reference for the nitrogen conversion measures in the soil, and has made significant contributions to the development of pollution-free agriculture.
Through soil tester test analysis, the nutrient status in the soil is always in a dynamic change due to factors such as precipitation and irrigation leaching, plant absorption, fertilization, mineralization of organic matter, adsorption and fixation, and redox. Under certain climatic conditions, fixed planting patterns and unreasonable fertilization accelerate the depletion of certain nutrients in the soil, and also lead to the accumulation of long-term excess nutrients. The study of soil nutrients of available phosphorus, potassium, zinc, and boron in Southwest China shows that soil nutrients have undergone significant changes in less than 20 years. The changes in the nutrient status of cultivated soils represented by vegetable plots in the same region are different from those in cultivated soils of food crops. Phosphorus in vegetable soils has accumulated obviously, and the depletion of potassium seems to be more serious. It is the result of long-term large-scale application of nitrogen and phosphorus fertilizers to vegetables.
The soil tester determined the nitrogenous elements in the soil and found that due to the large amount of nitrogen fertilizer application in recent years, the nitrate pollution in groundwater was caused. The places where the content of nitrates in the groundwater in the southwest exceeds the standard are mainly suburban areas with high production levels and fertilizing amount, high value-added economic crop cultivation areas, large-scale farms, and nitrogen fertilizer plants, and are mostly distributed in plains and valleys. For this reason, the application of the soil tester provides a data reference for the nitrogen conversion measures in the soil, and has made significant contributions to the development of pollution-free agriculture.
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