Study On The Reasonable Values Of Agricultural Land Gradation Factor Parameters

Gradation on agriculture land quality is a strategic, basic and public work in the investigation and evaluation of land resources survey and evaluation for the unified national deployment. The work of agricultural land classification is the guarantee for the coordination of the management of land resources, quality and ecology,and it is the basis of promoting farmland to fill up the balance, permanent basic farmland delineation, land rectification, etc. It is the technical support and decision-making basis for the efficient, economical and intensive and sustainable utilization of cultivated land resources. And it is to promote land transfer and agriculture, rural development and farmers’ prosperity, building a resource-saving society and the bridge.Our country has completed two rounds of gradation on agriculture land at present(We call the results of agricultural land classification in 2005 and the results of agricultural land classification in 2010 for short.), while there are some differences in the results of two rounds of grading. The main reason that Yun Wenju thinks the change of farmland quality is the main reason is the corresponding range of the two survey. I compare and analyze the results of agricultural land classification in 2010 and 2005, and I find that the main reason for the difference is the gradation factor parameters which change greater in the solar and temperature potential productivity and yield ratio. And then, according to the technical route of agricultural land classification, the results of agricultural land classification of different parameters are calculated by two two combination. Finally, the results of agricultural land classification were tested by comparison and analysis. Results the results showed that the yield of the crop yield was compared with that of standard sample by 2005, that is, the yield ratio of crop output was tested by 2010. By means of regression analysis, normal distribution, neighboring counties edge joint test method was used to test the remaining grading results. The results show that the 2005 specified crop photosynthesis temperature potential productivity index grading results through the above test.Through this study found that Mianxian two rounds of agricultural land grading results were the main reason causing is to specify the crop photosynthesis temperature potential productivity index and yield ratio coefficient changes larger, Mian County farmland grading should by 2005 specified crop photosynthesis temperature potential productivity index and 2010 specified crop yield ratio.