温州ミカン園におけるブロマシル除草剤の連年使用の影響に関する研究 : 第2報残効期間および土壌残留に及ぼす影響

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By recurrent annual applications a thorough study of the herbicide "Bromacil (80% wettable powder)" was made on citrus (Satsuma Mandarin) orchard with the objective of explaining the influence of this herbicide on soil persistence, residue and soil chemical properties. 1) For evaluation of residual activity of bromacil, bioassay utilizing Japanese radish (the lethal concentration of bromacil was 0.05 ppm in soil) was performed on the soil samples collected on the 2nd, 3rd, 4th and 5th months from 7th annual application plot and for control, from the adjacent first application plot. The same soil samples as the above were taken after the 9th year for the chemical analysis by gas chromatography and after the 8th year for analysis of soil chemical properties. 2) Residual activity of bromacil in the annually applied plot appeared to be of less persistence than in the first applicated plot. There was little herbicidal activity of the herbicide on assay plant when the bioassay was conducted on the soil sample taken three months after the treatment in the repeatedly applied field. 3) Residue (After three months) of bromacil in annually applied soil decreased about 14% in comparison with the first application soil. This evidence seems to indicate that bromacil residue was not cumulative but actually decreased in the amount from the first treatment application. 4) Effects of the repeated application of bromacil on soil chemical properties manifested a decrease in the content of humus and the total nitrogen, and this tendency was the greater when applied at the higher application dosage. The reason is considered to be due to the influence of decreased weed volume.
日本雑草学会の論文
1978-06-25

温州ミカン園におけるブロマシル除草剤の連年使用の影響に関する研究 : 第2報残効期間および土壌残留に及ぼす影響

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