Study on main factors affecting on irrigation water during growing stages of paddy crops

a:3:{i:0;s:498:"irrigation water is one of the most essential Wings that has to be concerned for the growth of paddy crops. In this study, first objective aimed to discuss about the main factors influencing the amount of irrigation water during growing stages of paddy crops based on historical data in Asakura Town, Fukuoka Prefecture, Japan. Second objective will focus on recent study of 1998 conducted on the same location as the former study for clarifying the actual irrigation water phenomena in the fields.";i:1;s:335:"Historical data were analyzed using method of Quantitative Analysis I. Objective variables consisted of water consumption, field management and canal management, were examined for analyzing the irrigation water phenomena. Furthermore, main focus of recent study was to evaluate the concerning components of water balance in the fields,";i:2;s:1235:"Results showed that irrigation water for water consumption was strongly influenced by natural condition such as rainfall, but it was not affected by the action of farmers. On the contrary, irrigation water for field management and canal management were influenced by the principle action of farmers in managing the irrigation water to paddy crops. Total of irrigation water obtained from average data of 5years observations that was required for water consumption, field management and canal management ranged of 57-113.45mm/day. Furthermore, recent study showed the total of irrigation water that was necessary for water consumption, field management and canal management ranged of 46.33-236.32 mm/day. There was no significant change of irrigation water for water consumption in both the studies. However, relative percentage of irrigation water for field management and canal management increased 8% and 14% respectively comparing to the former study. These facts indicated that the actual irrigation water operated under traditional water right had been applied in higher range than the necessary, especially for field management, and canal management. Farmers seem not intended to apply the irrigation water in a strict condition.";}