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Novelty, Knox County
Field Day
*Our Field Day was held August 7, 2008
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Randall Smoot
P.O. Box 126
Novelty, MO 63460
Phone: 660-739-4410
Email: SmootR@missouri.edu
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ORGANIC WEED CONTROL COMPARISON
(ORGAN0201)
K. Nelson, D. Harder, E. Dilworth, and R. Smoot
Clear hilum soybean are food grade soybean grown for use in soymilk
and tofu production. In 1999, there was little organic soybean
production research data available on clear hilum soybean in
Missouri. Returns from organic food-grade soybean were estimated at
over $400/acre when compared with regular soybean averaging 48
bu/acre and a market price of $5.25/bu (Frerichs et al. 2000). Yield
comparisons were initiated in 1999 at the
Greenley Research Center under a typical organic soybean production
culture which utilized multiple tillage treatments for weed control.
Two or three rotary hoeings were followed by at least two
cultivations and hand weeding if necessary.
A research study was initiated to compare a typical organic weed
management system to a conventional Roundup Ready® weed management
system (Table 1). Asgrow 3701 soybean were planted on June 12, 2001
in 30 inch rows. Plots were 10 by 30 ft. Roundup UltraMax was
applied on July 23 to eight to 24 in. weeds. Weeds included tall
waterhemp, velvetleaf, redroot pigweed, common lambsquarters, Venice
mallow, prickly sida, large crabgrass, giant foxtail, fall panicum,
and jimsom weed. Weed-free soybean grain yield was 45.2 bu/a which
was similar to the Roundup Ready® and organic weed management
systems. Grain yield for all treatments was greater than the
untreated control.
Additional information on organic production systems and organic
soybean is available from your local extension agronomist. In
Northeast Missouri, contact Dr. Leon McIntyre (Linn Co.) or Dr. Alix
Carpenter (Marion Co.) for additional information on organic soybean
production or marketing. The results of this study have been
encouraging continued research has been planned at the Greenley
Memorial Research Center.
Table 1. Organic weed control compared with a Roundup Ready® weed
management system in 2001 (Organ0201).
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| Weed management program | Yield |
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| bu/acre | |
Organic (Rotary hoe 2x fb cultivation 2x) | 37.6^ | |
Untreated control | 14.3 | |
Roundup UltraMax (26 oz/acre) + AMS (17 lb/100 gal) | 44.6^ | |
Weed-free | 45.2^^ | |
LSD (p<0.05) | 8.0 |
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^Grain yield was not significantly less than the highest yielding treatment.
^^ Highest yielding treatment.
References:
Frerichs, R.L., E.D. Nafziger, B.E. Swanson, S. Eckhoff, and D.H. Lattz. 2000. Specialty corn and soybean fact sheets. University of Illinois at Urbana-Champaign. AE-4736. pp. 48.
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