A Study of the Effective Factors in gap productivity irrigation systems in agricultural by use approach Oaxaca- Blinder

By attention to water scarcity, need consideration and improvement irrigation systems, necessary to be done studies about this situation. By regard to climate condition and low irrigation efficiency in our country, encouraging the farmers to use this technology and extending modern irrigation system is inevitable. Using modern irrigation methods with high productivity causes an increase in the total area under cultivation and the crop yield per unit area, but also causes of increasing farmers income. In this study attempt that modern irrigation methods has been effective on productivity agricultural between farmers in province Kerman. And also difference productivity agricultural between modern irrigation and traditional irrigation methods have affected by which factors.

the data were collected by completing 140 questionnaires in south of province Kerman in three town (Jiroft, Anbarabad and Kahnoj) by use random sampling. And then consideration productivity agricultural in two modern irrigation and traditional irrigation systems by use Oaxaca-Blinder decomposition method and Recentered influence function model. Then data was analyzed by software Stata.

the result of production function showed that family size, marriage, total area under cultivation, Machinery and labor family were signification variables on productivity agricultural in traditional irrigation and education and type machine were signification variables on productivity agricultural in modern irrigation. The result of decomposition method showed that ratio of Factors explaining was -17 percent and factors unexplained was -19 percent that signification. In other words if Factors explaining in traditional irrigation was small as this factors in modern irrigation than productivity agricultural increased as 17 percent in traditional irrigation. If rate of return specific factors in unexplained sector in modern irrigation was small as this factors in traditional irrigation than productivity agricultural decreased as 19 percent. Recentered influence function method showed that in unexplained sector, type seed, amount of seed and use of machine in high decile and labor family in low decile were case gap in productivity. In explaining sector age, labor family, education and total area under cultivation in high decile and number household and education in low decile were important factors in gap productivity.

Also the result showed that share of unexplained factors more than explaining factors. And traditional systems less accesses to resource high yield and use of modern irrigation system, could increase productivity agricultural. Therefore can be increased level of production by improve irrigation system and optimum use of resource water.