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Herbicide trials in onions.

Herbicide trials in onions.

Rep.Quebec Soc.Prot. Plants, 143-7. bibl.11

The following were compared with chlorpropham 5 pounds per acre applied pre- and post-em. in 50 gal water: (1) calcium cyanamide 75 pounds per acre + potassium cyanate 8-10 pounds per acre in 60-80 gal water, pre- and post-em. gave better yields in trials over 2 years, but in a third year at 60 + 8 pounds per acre gave very poor results; (2) liquid cyanamide 5 gal/ac in 40 gal water, pre-and postem. (1 trial only) gave a much higher yield than chlorpropham and slightly higher than the weeded control; (3) EPTC 5 pounds per acre pre-em. in 64 gal water failed to control weeds; (4) monuron 1 pounds per acre pre-em. greatly reduced yields in 2 out of 3 years and was obviously toxic to the onions; (5) sodium isopropylxanthate 9 pounds per acre and (6) Hydrin (mixture of aromatic oils) 6 gal/ac, both applied post-em. in 50 gal water, both in 2 years gave much inferior weed control to chlorpropham but a higher yield in 1 year. Varsol and calcium cyanamide powder applied pre-em. followed by 1 or 2 post-em. treatments with potassium cyanate were no, or only slightly, superior to the latter applied post-em. without them.

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