2,3-Dicyano-5-propylamino-6-(3-chlorophenyl) pyrazine の除草作用に関する研究 / 第2報土壌中の挙動

概要

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The present investigations were undertaken to study the herbicidal activity, adsorption and residues of 2, 3-dicyano-5-propylamino-6-(3-chlorophenyl) pyrazine (K-503) in four soils shown in Table 1. The results are as follows : 1) Herbicidal activities of K-503 showed a negative correlation with organic matter content (Fig. 1). 2) The adsorption of K-503 to soil increased in the soils with a higher organic matter content. In the leaching test in which 30mm artifical rainfall was added to the soil surface, ninety percent of applied K-503 remained in the upper 1cm layer (Table 2 and Fig. 2). 3) Residual activities of K-503 in soil decreased in the soils with higher organic matter content. The decrease of K-503 was very slow in sterile soil. K-503 was easily decomposed in the soil with high organic matter content as the temperature rose. K-503 also decomposed rapidly by sunlight (Fig. 3, Fig. 4. Fig. 5 and Fig. 6).
日本雑草学会の論文
1985-05-25