Last Updated:
Thursday, May 27, 2004 02:49:18 PM
Published by North Dakota State University
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| Roundup Ready Canola-Optimum
application timing (1998) Roundup Ready canola was seeded on May 15 at 700,000 plants per acre. Seed bed preparation was conventional with 7.5-inch row spacing. Treatments consisted of early-post (June 6), mid-post (June 15), and late-post (June 22) applications. On June 6 canola was 2 to 3-leaf, wild oat was 3-leaf. On June 15 canola was 4-leaf, wild oat was 4-leaf. On June 22 canola was 6-leaf, wild oat was 6-leaf. Wild oat (Wioa) control was evaluated on July 4 and August 11. The canola was harvested August 18.
Soil conditions were very dry for the first 30 days after seeding (0.5 inch precip). We received 8 inches of rainfall the remainder of the growing season. Flea beetle population was high in surrounding fields, but there was little or no damage to the Roundup Ready canola which had been treated with Gaucho. Wild oat control was excellent with all herbicide treatments. Any
treatments receiving the late-post application caused lower leaves to turn a
purplish color and also delayed flowering. Delayed flowering was not
observed with the early- or mid-post applications. Yield decreased with
later applications when Roundup Ultra was applied at 16 or 32 fl oz alone.
Weed competition and/or crop injury may have contributed to the yield
decrease. A decreasing yield trend was not observed in the split
applications of Roundup Ultra. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Last Updated:
Thursday, May 27, 2004 02:49:18 PM
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