. Agri-news. Agriculture. ^anadiana : S£ P " 1 T993 ooooooooooooooooc August 16,1993 Rain, weeds and using pre-harvest glyphosate Good moisture across the province has brought second growth in crops as well as new flushes of weeds, so producers are thinking about pre-harvest glyphosate says an Alberta Agriculture specialist. "Bookings for commercial herbicide applicators for pre-harvest glyphosate—trade names Roundup, Laredo, Wrangler and Renegade—have been brisk so far," notes Mark Olson, regional crop production specialist in Fairview. Glyphosate as a pre-harvest treatment is
. Agri-news. Agriculture. ^anadiana : S£ P " 1 T993 ooooooooooooooooc August 16,1993 Rain, weeds and using pre-harvest glyphosate Good moisture across the province has brought second growth in crops as well as new flushes of weeds, so producers are thinking about pre-harvest glyphosate says an Alberta Agriculture specialist. "Bookings for commercial herbicide applicators for pre-harvest glyphosate—trade names Roundup, Laredo, Wrangler and Renegade—have been brisk so far," notes Mark Olson, regional crop production specialist in Fairview. Glyphosate as a pre-harvest treatment is a good control for perennial weeds such as Canada thistle and quackgrass he adds. "However glyphosate, in the strictest sense, isn't a desiccant as many farmers have come to ; A desiccant is an agent that speeds up drying plant material by removing moisture. Desiccants such as diquat (trade name Reglone) disrupt cell growth by killing the plant immediately, just like frost. Glyphosate however, blocks protein synthesis of amino acids. This action is slower than traditional desiccants. "In terms of reducing time to harvest, glyphosate will shorten the period compared to doing nothing, since green plants such as weeds and late tillers are killed," says Olson. "However, glyphosate won't reduce the amount of small and light kernels if the tillers have already ; When applied to peas, glyphosate can help obtain better quality by preventing earthtag he adds. Earthtag is an accumulation of dirt on the pea from the mixture of cell sap from actively growing weeds and dust caused by harvest operations. Earthtag can cause loss of grade, for example dropping from human consumption to feed grade. This is especially true of yellow peas that show dirt more readily. "Farmers should be aware that glyphosate isn't registered on peas for seed, since there's evidence it affects germination the following year," he warns. Recently, glyphosate
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