Regulation of Amitrole and Diuron Toxicity by Phosphorus

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Abstract
The influence of soil-applied phosphorus on the phytotoxicity of soil-applied 3-amino-s-triazole (amitrole) and 3-(3,4-dichlorophenyl)-1,1-dimethylurea (diuron) for corn(Zea maysL.), ryegrass(Lolium multiflorumL.), rye(Secale cerealeL.), snapbeans(Phaseolus vulgarisL.), soybeans(Glycine max(L.) Mers.), sorghum(Sorghum vulgarePers.), wheat(Triticum aestivumL.), cotton(Gossypium hirsutumL.), peanuts(Arachis hypogaeaL.), and peas(Pisum sativumL.) was studied under greenhouse conditions. All species except cotton and peanuts indicated an amitrole-phosphorus interaction. Greater phytotoxicity was found for a given rate of amitrole as the soil phosphorus level was increased. A diuron-phosphorus interaction was observed for cotton and soybeans only.