Soil Core Test, a Method of Pesticide Leaching Assessment for Upland Field

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  • 畑圃場における農薬鉛直浸透評価法としての土壌コア試験
  • ハタケ ホジョウ ニ オケル ノウヤク エンチョク シントウ ヒョウカホウ ト シテ ノ ドジョウ コア シケン

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Abstract

A vertical infiltration of pesticides in upland field was evaluated by a soil core method. Surface soil layer (0-10cm) was collected by a soil core collector (10cm diameter, stainless steel) from an upland field treated with metalaxyl (Ridmil MZ®/WP), metolachlor (Dual®/EC) and bromacil(Hyper X®/WP). A steel cylinder loaded with vertically divided acrylic resin liner (5cm inner diameter, 3mm thickness) was guarded by stainless pipe (10cm inner diameter, 10cm height) and was driven to 50cm under the surface. By this sampling method, the soil core from 10cm to 50cm layers was collected to be free from the contamination with pesticides in surface soil. The soil cores in acrylic resin liner collected from 6 spots in the field were divided in 10cm soil layers, and mixed thoroughly for each layer. Soil water in each soil layer was separated by centrifugation at 11, 000rpm for 60min at 4°C. The concentration of bromacil in soil water from 40-50cm soil layer was 0.114mg/L at 105 days after the pesticide application, while metalaxyl and metolachlor were not detected in soil water below 30cm depth. No leaching water of pan-lysimeter was collected from the depth of 50cm-soil layer. The leaching water in porous-cup laid at the depth of 50cm did not contain any pesticide.

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