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Behavior of simetryn and thiobencarb in rice paddy lysimeters and the effect of excess water storage depth in controlling herbicide run‐off
Author(s) -
PHONG THAI KHANH,
WATANABE HIROZUMI,
NISHIMURA TAKU,
TOYODA KOKI,
MOTOBAYASHI TAKASHI
Publication year - 2008
Publication title -
weed biology and management
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.351
H-Index - 36
eISSN - 1445-6664
pISSN - 1444-6162
DOI - 10.1111/j.1445-6664.2008.00304.x
Subject(s) - lysimeter , paddy field , agronomy , manure , environmental science , environmental chemistry , biology , soil science , chemistry , soil water
Eight small‐scale lysimeters with different excess water storage depths (EWSDs) were used to investigate the behavior of two herbicides, simetryn and thiobencarb, under paddy conditions. The concentration of simetryn dissipated similarly in all the lysimeters, while the thiobencarb concentration varied significantly because thiobencarb can adsorb onto the dissolved organic matter in a manure slurry, which was applied to six of the lysimeters. The herbicide losses (the percentage of the applied mass) from the lysimeters were reversely proportional with the EWSD. The correlation was stronger for simetryn than for thiobencarb. An appropriate EWSD is required to effectively prevent herbicide run‐off from the paddy field, especially when a rainfall event occurs soon after herbicide application.