Behavior of Pesticides in Paddy Fields in Hiroshima Prefecture.
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概要
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Mass and economic overall input-output balance was studied between paddy fields which is steady system and their environment. Concentration of pesticides and manures in paddy fields, usage of pesticides, working times, the crop yields and economic balances were investigated during April to October in 1996 in three farmhouses (A, B, C) in Hirosima prefecture. Behaviors of pretilachlor and benthiocarb in herbicides in paddy fields were analysed by gas chromatography. Maximum concentration of pretilachlor in paddy fields of farmhouses A and B were 99.6-201μg/l in one day after spraying and 119-461 μg/1 in 1-2 days after spraying, respectively. Maximum concentration of benthiocarb in paddy fields of farmhouse B was 7.48.113 μg/l in 5-8 days after spraying. Pretilachlor in paddy fields of farmhouses A and B was detected until 22-28 days after spraying and 11-24 days after spraying, respectively. Benthiocarb in paddy fields of farmhouse B was detected until 31 days after spraying. pretilachlor outflow through drain and its rate to total sprayed pretilachlor were 1110 mg, 1.09% and 1043 mg, 0.77% respectively, in two paddy fields of farmhouse A. Since some pesticides (one is supposed to be benthiocarb) were detected in paddy fields of farmhouse C which does not use pesticides at all, a contamination of pesticides from surrounding p addy fields was observed. Amount of sprayed pesticides to standard usage was appropriate for both farmhouses A and B. Working time per paddy fields area was larger for farmhouse A than B except spraying manures. Working time of farmhouse C was much larger than those of A and B. Main expences of farmhouses A, B and C were manures&soil improvement, pesticides and ducks which eat insects and grass, respectively. Since ratios of income to expenses for farmhouses A, B and C were 8.6, 9.5 and 31, larger working time of farmhouse C was conpensated by larger incomes.
- 社団法人 環境科学会の論文
社団法人 環境科学会 | 論文
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