Development of rice cultivation technology using drip irrigation for the recudtion of methane gas emission and arsenic content in brown rice
Japan Society for the Promotion of Science:Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)
Date (from‐to) : 2017/04 -2020/03
Author : Toyota Masanori
Drip irrigation is an irrigation method in which water is supplied drop by drop from a tube to the plant base. The soil in flooded paddy is reducing, whereas that in the upland field cultivating paddy rice using drip irrigation is an oxidized state, that suppresses methane gas emission because anaerobic methanogens cannot act in an oxidized state. Also, since arsenic acid in the oxidized state is insolubilized, it is expected that the content of arsenic in brown rice will decrease. As a result of the field test, drip irrigation reduced methane emission by about 80% compared to flooded cultivation. Also, in an experiment using arsenic-contaminated soil in an isolated test paddy, the content of arsenic in brown rice cultivated by drip irrigation was reduced by about 90% compared to flooded cultivation.