The behavior of Di-Trapex in soil

概要

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The behavior of Di-Trapex (20% methylisothiocyanate + 80% D-D) in a field has been studied. The chemical was applied in the Kuroboku soil (sandy clay loam). The soil sample was prepared from different times and different depth after fumigation. The concentration of fumigant were determined by means of gas chromatography. It was evident that methylisothiocyanate (MITC) and 1, 3-dichloropropene (1, 3-D, active ingredient of D-D) differed in the rate of release from soil. MITC exhibit the rapid disappearance curve from one week to three weeks after application, while 1, 3-D was detected at less than half amount of initial dose one week after application and then the gentle disappearance curve was observed. Finally, 7 weeks after application, the concentration of MITC and 1, 3-D in the soil reached to 0.5 ppm more or less respectively. Furthermore, the test was carried out to study the influence of aeration on the residues of compounds treated in soil. As the result of aeration conducted one week after application, no significant difference was observed in the rate of 1, 3-D disappearance. The release of MITC from soil was promoted by an aeration especially in the deeper layer (10-20 cm) when Di-Trapex was applied at 15 cm depth. No significant efficacy for aeration was obtained between plow and rotary cultivation.
日本線虫学会の論文