Agronomy 2012, 2(4), 295-311; doi:10.3390/agronomy2040295
Article

Integrated Palmer Amaranth Management in Glufosinate-Resistant Cotton: I. Soil-Inversion, High-Residue Cover Crops and Herbicide Regimes

1 Agronomy and Soils, Auburn University, Auburn, AL 36849, USA 2 National Soil Dynamics Laboratory, Agricultural Research Service, United States Department of Agriculture, 411 South Donahue Drive, Auburn, AL 36852, USA
* Author to whom correspondence should be addressed.
Received: 29 August 2012; in revised form: 23 October 2012 / Accepted: 24 October 2012 / Published: 5 November 2012
(This article belongs to the Special Issue Weed Management and Herbicide Resistance)
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Abstract: A three year field experiment was conducted to evaluate the role of soil-inversion, cover crops and herbicide regimes for Palmer amaranth between-row (BR) and within-row (WR) management in glufosinate-resistant cotton. The main plots were two soil-inversion treatments: fall inversion tillage (IT) and non-inversion tillage (NIT). The subplots were three cover crop treatments: crimson clover, cereal rye and winter fallow; and sub subplots were four herbicide regimes: preemergence (PRE) alone, postemergence (POST) alone, PRE + POST and a no herbicide check (None). The PRE herbicide regime consisted of a single application of pendimethalin at 0.84 kg ae ha−1 plus fomesafen at 0.28 kg ai ha1. The POST herbicide regime consisted of a single application of glufosinate at 0.60 kg ai ha−1 plus S-metolachlor at 0.54 kg ai ha−1 and the PRE + POST regime combined the prior two components. At 2 weeks after planting (WAP) cotton, Palmer amaranth densities, both BR and WR, were reduced ≥90% following all cover crop treatments in the IT. In the NIT, crimson clover reduced Palmer amaranth densities >65% and 50% compared to winter fallow and cereal rye covers, respectively. At 6 WAP, the PRE and PRE + POST herbicide regimes in both IT and NIT reduced BR and WR Palmer amaranth densities >96% over the three years. Additionally, the BR density was reduced ≥59% in no-herbicide (None) following either cereal rye or crimson clover when compared to no-herbicide in the winter fallow. In IT, PRE, POST and PRE + POST herbicide regimes controlled Palmer amaranth >95% 6 WAP. In NIT, Palmer amaranth was controlled ≥79% in PRE and ≥95% in PRE + POST herbicide regimes over three years. POST herbicide regime following NIT was not very consistent. Averaged across three years, Palmer amaranth controlled ≥94% in PRE and PRE + POST herbicide regimes regardless of cover crop. Herbicide regime effect on cotton yield was highly significant; the maximum cotton yield was produced by the PRE + POST herbicide regime. Averaged over three years, the PRE, POST and PRE + POST cotton yields were about three times higher than no herbicide regime. In a conservation tillage production system, a PRE + glufosinate POST herbicide based regime coupled with a cereal rye cover crop may effectively control Palmer amaranth and maximize cotton yields.
Keywords: cover crops; glufosinate-tolerant cotton; herbicide regimes; soil-inversion

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MDPI and ACS Style

Aulakh, J.S.; Price, A.J.; Enloe, S.F.; Santen, E.V.; Wehtje, G.; Patterson, M.G. Integrated Palmer Amaranth Management in Glufosinate-Resistant Cotton: I. Soil-Inversion, High-Residue Cover Crops and Herbicide Regimes. Agronomy 2012, 2, 295-311.

AMA Style

Aulakh JS, Price AJ, Enloe SF, Santen EV, Wehtje G, Patterson MG. Integrated Palmer Amaranth Management in Glufosinate-Resistant Cotton: I. Soil-Inversion, High-Residue Cover Crops and Herbicide Regimes. Agronomy. 2012; 2(4):295-311.

Chicago/Turabian Style

Aulakh, Jatinder S.; Price, Andrew J.; Enloe, Stephen F.; Santen, Edzard V.; Wehtje, Glenn; Patterson, Michael G. 2012. "Integrated Palmer Amaranth Management in Glufosinate-Resistant Cotton: I. Soil-Inversion, High-Residue Cover Crops and Herbicide Regimes." Agronomy 2, no. 4: 295-311.

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