飼料用トウモロコシ畑におけるアメリカイヌホオズキ(Solanum americanum Mill.)の化学的防除法
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Chemical control treatments of American black nightshade (Solanum americanum Mill.) in silage corn were evaluated. Field experiments were conducted to determine the effects of three herbicide application systems and one was left untreated. Treatments consisted of atrazine+metolachlor (7.4+11.0g ai/a (gram active ingredient per are)) pre-mix formulation applied at PRE, dimethenamid+linuron (7.0+6.0 g ai/a) pre-mix formulation applied at PRE followed by atrazine+metolachlor (7.4+11.0 g ai/a) pre-mix formulation at POST, and nicosulfuron (0.6 g ai/a) applied at POST. Weed dry weights were decreased to 11-26% of that in the untreated plots by each herbicide treatments. American black nightshade plant number and its proportion in residual weeds were larger compared with the others for POST nicosulfuron treatment. PRE atrazine+metolachlor, and PRE dimethenamid+linuron with POST atrazine+metolachlor application exhibited effective American black nightshade control. POST nicosulfuron alone would increase American black nightshade, instead.
- 2012-10-15
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