| The aim of this study is to discuss investment intensity basis of agri-tech extension project and the problem of proper scale in agri-tech extension at the interim of socialist market-oriented economy from planned economy. The study shows that agri-tech extension project plays an important role in the agri-tech extension in the past, at present and in the future. Especially with the coming of agricultural development phase in which China is going to join WTO, it is the urgent problem faced by agriculture that efforts are made to increase agri-tech extension investment at national level in order to enhance international competitive power and realize the sustainable development of agriculture in the short time. While with the increasing of agritech extension investment at national level, the importance of its administration shows out. Reasonable use of limited resources is the urgent problem faced by national administrative department of agri-tech extension and the important part of this study.The economic system transmission and the present state of agriculture and peasants are the background of the study. Efforts are made to study the organization of agri-tech extension activity, present state of agri-tech extension institution, the change of agri-tech extension methods and rules of new techniques used by peasants. Combining with lots of spot investigation and research, the study puts forward the basic affecting factor and references standard in agri-tech extension investment at national level. The dissertation is composed of five parts, which are introduction, theory analysis, main study, model and calculation of related coefficient, results and policy suggestions.In introduction, the necessity of enhancing agri-tech extension investment and administration at national level and the importance of agri-tech extension investment project in resolving the problems during the new agricultural stage are systemically discussed. The study indicates that enhancing agri-tech extension investment and management at national level is the important measure and insurance to increase international competitive power of Chinese agriculture and realize sustainable development of agriculture.In the part of theory analysis, starting from defining the connotation of agri-tech extension project and investment intensity at national level, author firstly understands the characteristics of agri-tech extension project and investment at national level. Those shows that agri-tech109Abstractextension project investment at national level is not productive cost that peasants adopt technology or expenditure, such as employee wages of project executing department, but the subsidy that country provides in order to extend some concrete technology. While agri-tech extension project investment intensity at national level means that the demand of agri-tech extension expenditure at certain scale. Its unit is marked by (ten thousand) yuan per (ten thousand) unit or (ten thousand)yuan per capital. Then analyze the characteristics of agri-tech extension system, region difference of agri-tech extension department and peasants, hard or easy extent of agri-tech extension and the effect of unpredictable expense caused by variation of price and expense on the demand of agri-tech extension expenditure. The result shows that the investment demand of the national agri-tech extension project consists of 4 parts, that is costs of administration, extension activity expenditure, subsidies and unforeseen costs. The factors affecting expenditure are technological difference, region difference, the difference in extension procedure and pattern, the executive period and all kinds of concrete expense standard such as the standard of extension personnel抯 subsidy and demonstration peasants?subsidy. In addition, on the basis of general rules of agri-tech extension, the suitable definition of proper agri-tech extension scale is put forward and the factors affecting it are simply analyzed. Based on theory analysis, agri-tech extension...
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