After the general survey of the soil, I stationed at the beginning of the year of Kun 86 and set up four points for each of the major soil types in the district: Shuangdun Farm, Municipal Agricultural Institute, Yanshan Village in Yanshan Town, and Shanxiangpu Village in Changqing Township. After the harvest of the two crops, the autumn and the autumn crops were subjected to localization and regular soil sampling tests. According to the technical requirements, the soil nutrient monitoring items included organic matter, total nitrogen, available nitrogen, available phosphorus, and available potassium, all of which were analyzed according to routine methods. In 1989, some samples were taken. Adjustments were made to add more than 2,000 items to the analysis of the ten years of paddy soil at Xiaoshan Township, Xiaoxiang Town, and Wangtao Village, Lilou Township. Industrial Oven,Industrial Non Oxidation Oven,Industrial Electric Oven,Dust-Free Industrial Oven DONGGUAN AIBO INSTRUMENT EQUIPMENT CO.,LTD , https://www.testchambersupplier.com
1 The basic characteristics of the soil at the monitoring site: six sites in the whole area, five soil species 1.1 Shajiang black soil is located in the north of the Municipal Agricultural Institute of chicken farms, PH7-8, the soil texture is heavy, the suitable tillage period is short, and the nutrient content is high. The way is the rotation of wheat beans.
1.2 Huangbaituo: Located in Laocenxu Village of Qinji Township, 300m south of the village, about PH7.5, wheat and rice rotation. 
Table 1 Changes of Organic Matter and Nitrogen Content at Various Monitoring Points within 10 Years 
Table 2 Changes of phosphorus and potassium content within 10 years at each monitoring site Huangbaitu: 200km west of Dage Village, Yanshan Township, about pH 7.5, wheat and rice rotation.
1.4 Paddy Soil: The 10-ton Nanmu South of Wanghao Village, Lilou Township, South China, where the organic matter content is relatively higher than that of the dryland soil. In addition to the available potassium, other nutrient contents are relatively poor in high-tillage and wheat-rice rotation.
1.5 Two-combined soil: Xiaocangshan Xiangcun, 200m northwest of the cement factory, PHS 8.5 years of growing vegetables.
1.6 Leakage silt: Shuangdun Village, Xiaojing Town, Shuangdun Farm Field 400m southeast, PHS 8.6, soil texture is heavy, not suitable for farming, poor permeability, dry hard, wet sticky, wheat and beans rotation.
2 Soil nutrient monitoring methods: Each soil nutrient monitoring point equipped with a soil nutrient quickness meter is marked with nearby topographical features, and samples are collected at fixed-point plots after noon and autumn harvests (without fertilization). ZOCM), fully mixed, quarantined, and at the same time, documented and documented agricultural measures, crop types, farming methods, fertilizers, and yields at the monitoring sites.
Monitoring project: organic matter, total nitrogen, available nitrogen, phosphorus, and potassium are all analyzed according to routine (specified soil census) analysis methods.
3 Conclusions and analysis:
In summary, during the ten years of soil organic matter, the content of available phosphorus has generally increased, nitrogen and phosphorus are abundant, and available potassium has increased or decreased. Some people think that with the increase in the amount of fertilizer, although the crop yield has increased, the soil fertility has decreased. However, from the monitoring result of soil nutrients in the suburbs for ten years, it seems that there is no contradiction between the increase in grain yield and soil fertility. The two can be both, but according to the results of several different kinds of soil tests in our region, the soil organic matter is increasing year by year, but individual soil species are only about 1.5%, and it still belongs to the middle-lower content. On the other hand, the available potassium content is widespread. Reduce, in order to adapt to future development. "Two high and one excellent" agriculture, the improvement of soil fertility in our region, must pay sufficient attention, especially to further increase organic fertilizer, make up potash fertilizer.
The soil fertility in our area has been continuously improved. In addition, in the increase of a large number of elements, but also targeted application of trace elements, boron deficiency, manganese in our area is more serious, boron and manganese in our area has a good promotion value. For example, zinc fertilizer is applied to grass crops, platinum fertilizer is applied to legumes, and boron fertilizer is applied to crucifers.