Abstract
The purpose of this study was to determine the amount of input-output energy used in two irrigation systems in baled alfalfa hay production in Hamedan province, Iran, from efficiency of energy consumption point of view. Data were collected from 80 alfalfa farms in August and September 2009. The sample volume was determined by random sampling method. The population investigated was divided in two gropes based on the irrigation system of farms as traditional irrigation system (Group I) and modern irrigation system (Group II). Total energy used in whole production life of alfalfa was 821615.19 MJ/ha in Group I and 723254.38 MJ/ha in Group II. The average inputs energy consumption was maximum for electricity in both gropes of farms. Investigation of energy indices in two gropes of farms showed using of water and energy is in better condition in Group II. In order to reduction of water and electricity consumption, it is suggested that the traditional irrigation systems replaced by modern irrigation systems that have high efficiency. Key words: Alfalfa, input-output energy, irrigation systems, Iran.
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