About
  PDF
Full Text
(12 K)

Comparison of Weed Management Stratagies in Roundup Ready (Glyphosate-Tolerant) Cotton Cropping Systems

A. L. Helm, J. W. Keeling, P. A. Dotray and D. T. Carmichael


 
ABSTRACT

Conservation tillage cotton cropping systems using a winter cover crop have gained increased acceptance on the Texas Southern High Plains. The development of Roundup Ready® cotton provides new options for postemergence weed control in these systems without cultivation or hand hoeing. Three conservation tillage-cropping systems were compared to conventional tillage at the AG-CARES research farm near Lamesa TX to evaluate the use of Roundup Ultra (glyphosate) postemergence-topical (PT) and postemergence-directed (PD) in Roundup Ready® cotton cropping systems. These systems, consisting of conservation tillage 40" rows, ultra-narrow row (UNR), and rye-sorghum-cotton rotation (R-S-C) were compared to conventional tillage. Rye was planted as a winter cover crop in the conservation tillage 40" rows and the UNR and was terminated in late March. All cropping systems consisted of three weed management systems. These include: 1) Prowl (pendimethalin) preplant incorporated (PPI) followed by (fb) Caparol (prometryn) preemergence (PRE) + cultivation (2X) (except in the UNR system) + spot spray (Roundup Ultra) plus hand hoe; 2) Prowl fb Roundup Ultra PT/PD; and 3) Roundup Ultra PT/PD (the UNR system received a late PT application of Roundup Ultra instead of the PD application). Each plot was 26 feet by 300 feet and received 13 inches of irrigation during the growing season through a LEPA irrigation system. Two Paymaster varieties (PM HS26 and PM 2326RR) were planted on May 12, 1999.



Reprinted from Proceedings of the 2000 Beltwide Cotton Conferences pg. 1473
©National Cotton Council, Memphis TN

[Main TOC] | [TOC] | [TOC by Section] | [Search] | [Help]
Previous Page [Previous] [Next] Next Page
 
Document last modified Saturday, Jun 17 2000