NEW HERBICIDES FOR VEGETABLE PRODUCTION ON PEAT SOIL
[N-(chloroacetyl)-N-(2,6-diethylphenyl)glycine] was safe for all crops tested and weed control was excellent to fair at rates from 4.5 to 9.0 kg/ha. Metolachlor[2-chloro-N-(2-ethyl-6-methylphenyl)-N- (2-methoxy-1-methylethyl)acetamide] and alachlor[2-chloro-N-(2,6- diethylpheny)-N-(methoxymethyl)acetamide] provided excellent weed control, but broccoli was injured at 4.5 and 6.7 kg/ha. Acetochlor [2-chloro-N-(ethoxymethyl)-N-(2-ethyl-6-methylphenyl) acetamide] was very effective in controlling weeds at 0.6 kg/ha, but crop tolerance was variable. Rates of acetochlor above 2.2 kg/ha injured all crops tested except onion, which tolerated rates as high as 4.5 kg/ha. Clomazone[2-(2-chlorophenyl)methyl)-4,4-dimethyl-3 isoxalidione] at 1.1 kg/ha gave excellent weed control in all crops tested, but only carrots were tolerant. Oxyfluorfen [2-chloro-1,3-ethoxy-4-nitrophenoxy) -4-(trifluoromethyl)benzene] is presently labeled for use in onion at a rate of 0.14 kg/ha and excellent weed control can be achieved. Care must be used in timing oxyfluorfen applications since it is applied after the crop has emerged and injury can result. Both sethoxydim [2-[1- (ethoxyimino) butyl]-5-[2-(ethylthio)propyl]-3-hydroxy -2-cyclohexen-1-one] and fluazifop-p [(+)-2-[4[ [5-(trifluoromethyl) -2-pyridinyl]oxy] phenoxy]propanoic acid] at 0.2 kg/ha + crop oil concentrate at 1.25% v/v for sethoxydim and 1% v/v for fluazifop provided excellent grass control with no injury of the crops tested.