Soil Nutrient Test Promotes Sustainable Development of Soil The quality of soil nutrients directly reflects the quality of soil fertility, and soil fertility affects the growth and yield of crops. Therefore, the research on soil nutrients is an important content and subject of agricultural growth. The soil nutrient tester can accurately detect soil organic matter content, nitrogen, phosphorus, potassium and other trace elements. Soil nutrient testing and analysis can effectively promote the sustainable development of soil fertility. In the field of soil science, although there is no consensus on the overall situation of soil nutrients, the intention of the fertilizer is not only the improvement of the crop's output value and the improvement of its quality, but also from the standpoint of sustainable development of agriculture. Pay attention to the progress of soil fertility and the continuous addition of soil nutrients. So far, the overall situation of soil nutrients has not been clearly defined. Therefore, the discussion on the evaluation methods of soil nutrients as a whole is particularly important and urgent. In the past, the evaluation of soil nutrient level emphasized the single factor assessment and qualitative assessment, and the quantitative assessment had certain one-sided arbitrariness. With the extensive use of modern research methods such as vague mathematics and multivariate statistical analysis, soil nutrient assessment has gradually focused on multi-factor assessment and quantitative assessment. Quantitative research has largely avoided the impact of one-sided elements of the evaluator and has become soil nutrients. A trend assessment. This paper uses the paddy crop rotation area in Anhui Province as the research area, and uses vague judgments and indices and methods to quantitatively evaluate the nutrient status of the soil. The purpose is to know all the soil nutrients in 6 counties (districts) in 6 counties (districts). , low-yield soil fertility and accurate fertilizer supply must be referenced. From 1840, the famous German chemist Liebig announced the famous paper titled “The Use of Chemistry in Agriculture and Physiologyâ€, and proposed the content of soil nutrient substances in the following long period since the plant mineral nutrient doctrine. The size of the supply of fertilizers has become the dominant direction for this category of research, and the results of the research are used as a criterion for assessing soil fertility. Soil scientist He Tongkang proposed to use the scoring method to assess soil fertility, that is, based on the nutrient factors in the soil to give a certain score on the size of the soil fertility and nutrient factors, the sum of the nutrient factors in all soils Shows whether the corresponding soil fertility is good or not. Each scoring element is based on scientific analysis and practical experience. The scoring method has been implemented, but the application of this assessment method has a great dependence on the professional level of the assessor, so there is no comparability and consistency between the evaluation results. In recent years, more and more mathematical methods have been used to evaluate soil fertility. In order to make soil fertility assessment tend to be quantified and standardized, different mathematical methods are used to statistically analyze a lot of information to obtain energy. The sexual goal that reflects the quality of soil fertility. Oil Patch Valves,Oilpatch Floating Ball Valve,Oilfield Ball Valve,Ductile Iron Check Valve ZHENGQIU VALVE GROUP CO.,LTD , https://www.sealweldballvalve.com