Soil Fertility Evolution And Nutrient Management Countermeasures Of Cultivated Land In Huairen County,Shanxi Province

The research was based on the analysis results of different points from the farmland soil of 9 villages and towns in Huairen County in 2014 and 2015,in order to study the grading assessment on the status of soil nutrient in Huairen County.Combining the second national soil survey data,the research analyzed the evolution trend of the past 30 years the county farmland soil nutrient and its causes,and put forward some corresponding countermeasures for nutrient resource management.The research results would provide theoretical basis and technical support for scientific precision fertilization and agricultural sustainable development of local soil.The results showed that:1)From the evaluation of the current situation in Huairen county farmland soil fertility grading could be seen,the soil organic matter is mainly concentrated in the five and six levels,accounting for 98.13%of the total area;The distribution of total nitrogen in soil was four,five and six levels,which was mainly distributed in level four and level five,accounting for about 91.19%of the total area of the county;The distribution of available P in soil at different levels of the five levels of distribution,mainly concentrated in the three,four level,accounting for about 62.80%of the county’s total area;The distribution of soil available potassium in the six grade level had different proportion,mainly concentration distribution in three and four level,accounting for the county’s total of 70.25%;It could be seen that the soil fertility of cultivated land in Huairen county was in the middle and low yielding fields.The nutrient status of the township’s analysis results showed that the Yunzhong Town,He Jia Bao,and Xinjiayuan three villages in the overall fertility level was higher,the proportion of middle and high yield fields was relatively large;while Hetou,Maxinzhuangz and Maozao,the overall fertility level of gross township was low,the low yield fields accounted for a large proportion.The other three towns was between this two levels,so it could be adopted fertilization management to take corresponding measures according to different situations.2)A very obvious change of soil fertility of arable land has been in Huairen County in recent 30 years,soil organic matter,total nitrogen,available nitrogen,available phosphorus content increased,while available potassium was decreased.The increase in nutrients from large to small order,the order followed by available phosphorus>total nitrogen>organic matter>available nitrogen>available potassium,and organic matter available nitrogen available potassium.The biggest increase available phosphorus,reached 141.12%.3)According to the evaluation of the present situation of soil fertility in Huairen County in recent years and the trend of soil fertility in the past 30 years and the cause analysis,in the future people should adopt organic fertilizer on nutrient management,promotion of straw,to improve soil fertility,improve soil organic matter;fertilizer application according to different regional balanced nitrogen,phosphorus because,fertilizer application technology of potassium supplement;at the same time should be the promotion of precision balanced fertilization technology and reasonable rotation,by raising the agricultural planting technology,the arable soil in Huairen to maximize its potential,in order to achieve stable and high yield of crops,obtain good economic benefits and environmental benefits.