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http://dx.doi.org/10.5389/KSAE.2021.63.3.075

Analysis of Variance of Paddy Water Demand Depending on Rice Transplanting Period and Ponding Depth  

Cho, Gun-Ho (Department of Agricultural Civil Engineering, Kyungpook National University)
Choi, Kyung-Sook (Department of Agricultural Civil Engineering, Kyungpook National University)
Publication Information
Journal of The Korean Society of Agricultural Engineers / v.63, no.3, 2021 , pp. 75-85 More about this Journal
Abstract
This study evaluated variations in the paddy rice water demand based on the continuous changing in rice transplanting period and ponding depth at the four study paddy fields, which represent typical rice producing regions in Korea. Total 7 scenarios on rice transplanting periods were applied while minimum ponding depth of 0 and 20 mm were applied in accordance with maximum ponding depth ranging from 40 mm to 100 mm with 20 mm interval. The weather data from 2013 to 2019 was also considered. The results indicated that the highest rice water demand occurred at high temperature and low rainfall region. Increased rice transplanting periods showed higher rice water demand. The rice water demand for 51 transplanting days closely matched with the actual irrigation water supply. In case of ponding depth, the results showed that the minimum ponding depth had a proportional relationship with rice water demand, while maximum ponding depth showed the contrary results. Minimum ponding depth had a greater impact on rice water demand than the maximum ponding depth. Therefore, these results suggest that increasing the rice transplanting period, which reflects the current practice is desirable for a reliable estimation of rice water demand.
Keywords
Rice water demand; transplanting period; ponding depth; effective rainfall; irrigation water supply;
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Times Cited By KSCI : 3  (Citation Analysis)
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