Fluctuation of surface soil water content before and after precipitation under FOEAS management
2016
Mochizuki, H. (NARO, Western Region Agricultural Research Center, Fukuyama, Hiroshima (Japan)) | Matsumori, K. | Takeda, H. | Okuno, R. | Kamei, M.
FOEAS (Farm Oriented Enhancing Aquatic System) consists of a buried porous tube which is connected to supply and drain control equipment to manage water table depth. The system can activate irrigation and drainage events to control soil water content to counter both drought and wet injury. The objective of the work reported in this paper were to characterize fluctuations in surface soil water content (0-20 cm depth) before and after precipitation under FOEAS management (-30 cm depth) during soybean cultivation by continuous field measurements, and to propose a simple model formula which can be used by farmers for estimating the soil water content at surface layer after precipitation. The results show that the soil water content at 0-10 cm layer fluctuated widely corresponding to rainfall events, but the one at 10-20 cm layer stayed constant than 0-10 cm layer under the FOEAS management condition. And a relation between the increase in the soil water content at 0-10 cm layer and the total rainfall can be explained by linear regression to a degree, and the daily decrease rates in the soil water content at 0-10 cm layer after precipitation events were assumed to be monotonous decreasing functions. Finally, a new simple empirical formula to estimate the soil water content at 0-10 cm layer was proposed by using the results obtained above.
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