Effect of Aqua-Gro^R, a soil permeation agent, on the mobility of herbicide in soil

Abstract

1. Aqua-Gro^R, a soil permeation agent, promoted the mobility of herbicides, such as simazine [2-chloro-4, 6-bis (ethylamino) -s-triazine], benef in [N-butyl-N-ethyl-α, α, α-trichloro-2, 6-dinitro-p-toluidine], pendimethalin [ N- (1-ethylpropyl) -3, 4-dimethyl-2, 6-dinitrobenzenamine], butamifos [O-ethyl-O-) 6-nitro-m-tolyl) sec-butylphosphoramid-othioate], amiprophos-methyl [O-methyl-O- (2-nitro-P-tolyl) isopropylphosphoramidothioate], benslide [O, O-diisoprpyl-S- (2-phenylsulf onylam-inoethyl) phosphorodithioate], methyl-dymrone [1- (α, α- dimethylbenzyl) - 3-methyl-3-phenylur-ea], and napropamide [N, N-diethyl-2- (1-naphth-yloxy) propionamide] in soil.
2. In the case of simazine, the increase in downward permeation in soil was proportional to the amount of Aqua-Gro^R added, regardless of rainfall.
3. Addition of Aqua-Gro^R to an emulsion of simazine resulted not only in an increased mobility of the herbicide but also in redused adsorption by soil, i. e., the herbicide was less readily retained by soil.
4. In the model experiments on soil adsorption and water solubility of simazine, it was found that Aqua-Gro^R decreased the adsorption to less than 30% and increased the solubility by 100%.