Investigation And Classification Of Cultivated Land Fertility Of Nanhui District In Shanghai

Through the basic survey sampling and testing grip on the region of arable land are more detailed investigation.In accordance with the principle of balanced and comprehensive we investigate some points of the basic conditions,site conditions,character profiles,pollution and agricultural production,with the techncal specifications we analysis about soil organic matter and a large number of elements,the detection of trace elements of the 392 samples.In these test results we grip on the region's arable land to the quality evaluation and classification.Key findings are as follows:1) soil nutrients:The region of soil organic matter content increased an average of 22.6 percent.The average total nitrogen content of the soil increased by 15.49 percent,the temporal and spatial variation of organic matter and the same trend.2) Classification:the area of Soil fertility levels as the first-class arable land are 2885.1 Ha,accounting for the region's total area of cultivated land 9.42 percent.The second-class arable land are 8423.4 Ha, accounting 27.49 percent.The Third-class arable land are 10351.8 Ha, accounting 33.78 percent.The Fourth-class arable land are 6063.2Ha, accounting 19.79 percent.The Fifth-class arable land are 2915.5 Ha, accounting 9.52 percent. Through Analysis and investigation,we basically have been made clear the area of soil nutrient content and scope of classification.On this basis,we propose the following suggestions:rational allocation of land resources,crop structure adjustment,the quality of the establishment of a farmland protection and nurturing of grip incentive mechanism, strengthen the monitoring of soil fertility and quality of dynamic management,the establishment of a farmland quality management of long-term mechanism.