Document Type : Research Paper

Abstract

This paper describes the extension requirements in use of drip irrigation systems in Tehran province. The study was functional (practical) in terms of goal, non-experimental in terms of control on variables, and causality-relational in terms of data collection. Data collection method was based on the documentary-library and field study (questionnaire) and statistical population included 547 samples of orchardists in Tehran province who used drip irrigation system in their farms. Sample size was calculated by Cochran formula equal to 192 persons and sampling method was simple relative random. To determine the questionnaire validity, comments and suggestions of faculties, agricultural extension researchers, and experts were used. The reliability of the questionnaire was determined by the Cronbach alpha coefficient at 87%. The results of multiple regression showed that the variables included requirements of educational-extension programs, cultural-social requirements, economical-agricultural requirements, human resources requirements, and educational-extension services had a positive role on the usage of drip irrigation systems. Furthermore, the mentioned variables explained 60  percent of changes in the dependent variable.