Production Function Of Land Quality Indicators - Arable Land

Land is the substance foundation of the society. The cultivated land is the primary of the land and the essence agriculture means of production. With the population's progressing, human beings are threatened by the fact that the output of the cultivated land cannot adapt to the progressively increasing demands. So evaluating the cultivated land resource correctly, especially the land for agriculture, is the base of the sustainable use and management. People pay more and more attention to the indicators of the land quality parameter. With the deep research of the land evaluation, it is necessary to choose and establish land quality indicators system (LQIS) according with the situation of the area. At present, the indicators on atmosphere and water quality are greatly used in many research fields, while LQIS has not been reached unanimity yet. Many international organizations and scientists are trying to establish the indicators, and it is one of the great science questions. Based on land's natural attribute and economic attribute, this paper researches the cultivated land quality indicators and its appliance to land quality evaluation with the help of the productive function (CD-function). The writer tries to reduce the artificial effects on land evaluation so that the result will conform to the area actual situation.The procedure of the agriculture has relations of input and output. The input procedure includes economy input and land quality input. The land quality input directly affects on the output. This paper chooses the indicators of economy and land quality input which has influence on the output, depending on CD-productive function to establish the function between input and output:Y: productive forces of the cultivated landF: input of the fertilizer and agricultural chemicalI: input of the irrigationL: input of the laborQ: input of the land qualityA: the level of average managementT: the level of changing managementa, b, c, d, f: productive elasticity coefficientThe factor of the land quality includes texture, content of the organic matter, degree of the pickled, the structure of the soil. They are connected by the formula:Q=( a , x T+ a 2 x P+ a 3 x O+ a 4 x S)/100Based on the data of the investigation from the 444 forms wheat input and output, statistics regressions are carried on by many kinds of scheme. By comparing all result of the scheme: determined coefficients, F, T static, we get the best combination, and the function as following:The research affords reasonable land quality indicators system for plain area, on the other hand, affords a simple and convenient method of land differential rent.