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RISS 인기검색어
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- 저자 : Fu¨hr, F. (검색결과 1 건)
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Behaviour of bentazon in the presence of rice plants in a lysimeter
Lee, Jae Koo,Fu¨hr, F.,Kyung, Kee Sung,Oh, Kyeong Seok 한국농화학회 1990 Applied Biological Chemistry (Appl Biol Chem) Vol.33 No.2
In order to simulate the rice paddy fields, two lysimeters of 0.25㎡ surface area were manufactured with stainless steel of 8mm thickness. When the herbicide ^(14)C-bentazon was applied to the surface by the conventional method for the control of weeds of rice plants, the leachates from the lysimeters contained 1.14%(lysimeter 1) -6.29%(lysimeter 2)of the originally applied radioactivities up to the 37th week after the application. The appromate amounts of COz evolved from the surfaces of the lysimeters in the presenece of rice plants during the experimental period of 20 weeks were about 1.33%(lysimeter 1) - 3.68%(lysimeter 2). No volatilization of bentazon from the soil surfaces was observed. The C-radioactivities detect in straw, ear without rice grain, chaff, and hulled rice grain after harvest corresponded to 2.5-3.2, 0.1, 0.05, and 0.03ppm, respectively, in two lysimeters. Partition of the ^(14)C-radioactivity pre sent in the leachates revealed that 96.1-98.95% of it remained in the organic phase(ethyl acetae), indicating that the leachates contain very small amounts of polar compounds resulting from the degradation of bentazon. In the time-course of the absrorption and translocation, the maximum amount of ^(14)C-radioactivity in the shoots, amounting to 4.08-7.57ppm, appeared 21 days agter the application. The degradation of bentazon in soil increased with soil temperature. The degradation products of small amounts detected in the leachates were identified as 6-0H and 8-0H bentazon by TLC and autoradiography.
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