For example the farmland cultivation plant, growth, obstacle, growth control and the dividing as the chemical injury reduction medicine which does not have the fact that chemical injury condition such as control and yellow conversion is made to cause vis-a-vis the cultivation plant the sufficient weeding effect is shown the wheat, the rye, the barley, enbaku, the corn, the sol gum, wata and the soy bean, the azuki bean and the colza, beat and the dry land rice etc vis-a-vis the weeds which live together in spite, general system< Conversion 1 >(As for R1 carbon count direct condition or branching condition alkyl group 4 - 15)So the chemical injury reduction medicine for farmland cultivation weeding which consists of nuclear substitution benzoic acid or that salt or that alkyl ester which are displayed is offered.畑地栽培植物例えば、コムギ、ライムギ、オオムギ、エンバク、トウモロコシ、ソルガム、ワタ、ダイズ、アズキ、ナタネ、ビート、陸稲などと共生する雑草類に対して十分な除草効果を示すにもかかわらず、栽培植物に対しては、生育障害、生育抑制、分けつ抑制、黄化などの薬害症状を生じさせることのない薬害軽減剤として、一般式【化1】(R1は炭素数4~15の直鎖状又は枝分れ状アルキル基)で表わされる核置換安息香酸若しくはその塩又はそのアルキルエステルからなる畑地栽培除草用薬害軽減剤を提供する。
