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1 January 2011 Application Timing of Harvest Aid Herbicides Affects Soybean Harvest and Yield
Joseph M. Boudreaux, James L. Griffin
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Abstract

Research was conducted over 2 yr to evaluate soybean response to harvest aid herbicide treatments paraquat at 0.28 kg ai ha−1, paraquat with carfentrazone at 0.014 kg ai ha−1, and sodium chlorate at 6.72 kg ai ha−1. Indeterminate and determinate soybean cultivars were treated when moisture of seed collected from the uppermost four nodes of plants averaged 60, 50, 40, 30, and 20% (± 2%). For each soybean cultivar, the harvest aid treatment by application timing interaction was not significant, and data for harvest aid treatments were averaged. Application of harvest aid at 60% average seed moisture reduced yield for the maturity group (MG) IV indeterminate cultivar 15.4% compared with the nontreated; 100-seed weight was reduced 12.4%. Yield and seed weight were not negatively affected when harvest aid was applied at 50% average seed moisture and soybean was harvested 14 and 15 d before the nontreated control. Although planting date in the 2 yr for the indeterminate cultivar differed by 26 d, number of days from planting to harvest aid application at 50% average seed moisture was 112 and 116 d. For MG V and MG VI determinate cultivars, application of harvest aid at 60% average seed moisture reduced yield compared with the nontreated control 22 and 18.1%, respectively, and at 50% average seed moisture 15.6 and 4%, respectively; seed weight reductions of 8.9 to 33.3% accompanied the yield reductions of the two cultivars. Reduction in soybean yield and seed weight was not observed when harvest aid was applied at 40% average seed moisture, and harvest for the 2 yr was 8 and 9 d earlier for the MG V cultivar and 10 and 14 d earlier for the MG VI cultivar.

Nomenclature: Carfentrazone; paraquat; sodium chlorate; soybean, Glycine max L. Pers. ‘Asgrow 4403 RR’, ‘Asgrow 5903 RR’, ‘Asgrow 6202 RR’

Joseph M. Boudreaux and James L. Griffin "Application Timing of Harvest Aid Herbicides Affects Soybean Harvest and Yield," Weed Technology 25(1), 38-43, (1 January 2011). https://doi.org/10.1614/WT-D-10-00045.1
Received: 18 March 2010; Accepted: 1 October 2010; Published: 1 January 2011
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