Resicore and Glyphosate Application Timings in Corn

Kansas Agricultural Experiment Station Research Reports, Aug 2017

A study was initiated near Garden City, KS, in 2016, comparing the weed control of several herbicide treatments in irrigated corn. All treatments provided excellent, season-long control of kochia, Russian thistle, Palmer amaranth and green foxtail. Herbicide-treated corn yielded 219 to 235 bu/a, which was 86 to 102 bu/a more than nontreated corn; however, no differences in yield occurred among herbicide treatments.

A PDF file should load here. If you do not see its contents the file may be temporarily unavailable at the journal website or you do not have a PDF plug-in installed and enabled in your browser.

Alternatively, you can download the file locally and open with any standalone PDF reader:

http://newprairiepress.org/cgi/viewcontent.cgi?article=7408&context=kaesrr

Resicore and Glyphosate Application Timings in Corn

Resicore and Gly phosate Application Timings in Corn R. Currie 0 Kansas State University 0 0 P. Geier 0 0 Kansas State University , USA Follow this and additional works at: http://newprairiepress.org/kaesrr Part of the Agronomy and Crop Sciences Commons, and the Weed Science Commons Recommended Citation - Article 26 This report is brought to you for free and open access by New Prairie Press. It has been accepted for inclusion in Kansas Agricultural Experiment Station Research Reports by an authorized administrator of New Prairie Press. Copyright 2017 Kansas State University Agricultural Experiment Station and Cooperative Extension Service. Contents of this publication may be freely reproduced for educational purposes. All other rights reserved. Brand names appearing in this publication are for product identification purposes only. K-State Research and Extension is an equal opportunity provider and employer. Resicore and Glyphosate Application Timings in Corn Creative Commons License This work is licensed under a Creative Commons Attribution 4.0 License. This Weed Science article is available in Kansas Agricultural Experiment Station Research Reports: http://newprairiepress.org/ kaesrr/vol3/iss5/26 2017 SWREC Agricultural Research Resicore and Glyphosate Application Timings in Corn Summary A study was initiated near Garden City, KS, in 2016, comparing the weed control of several herbicide treatments in irrigated corn. All treatments provided excellent, seasonlong control of kochia, Russian thistle, Palmer amaranth and green foxtail. Herbicidetreated corn yielded 219 to 235 bu/a, which was 86 to 102 bu/a more than nontreated corn; however, no differences in yield occurred among herbicide treatments. Introduction Hornet WDG (flumetsulam + clopyralid), Keystone NXT (acetochlor + atrazine), Resicore (acetochlor + clopyralid + mesotrione), and SureStart II (acetochlor + clopyralid + flumetsulam) have been shown to provide broad spectrum weed control in corn. Therefore, it was the objective of this study to measure their level of control under local irrigated conditions. Procedures An experiment conducted at the Kansas State University Southwest Research-Extension Center near Garden City, KS, evaluated the efficacy of preplant or preemergence followed by postemergence applications in corn. All herbicides were applied using a compressed-CO2 backpack sprayer, delivering 20 GPA at 3.0 mph and 27 psi. Application dates, timings, and environmental conditions are shown in Table 1. Soil was a Ulysses silt loam with 1.4% organic matter, pH of 8.0, and cation exchange capacity of 18.4. Plots were 10- by 35-feet and arranged in a randomized complete block with four replications. Visual estimates of weed control were taken on May 26 and July 7, 2016. Corn yields were determined September 26, 2016, by mechanically harvesting the two center rows of each plot and adjusting weights to 15.5% moisture. Results and Discussion Kochia, Russian thistle, and green foxtail control was 98% or more regardless of herbicide treatment on May 26. Kochia control remained at 98% or more on July 7, while all herbicides provided complete Russian thistle and green foxtail control at the later rating date. Palmer amaranth control was 100% regardless of treatment or evaluation date (data not shown). Herbicide-treated corn yielded 219 to 235 bu/a, which was 86 to 102 bu/a more than nontreated corn; however, no differences in yield occurred among herbicide treatments (data not shown). a AMS is ammonium sulfate. b 19 DPP is 19 days preplant, PRE is preemergence and POST is postemergence when corn was 20 to 24 inches tall. 100 100 100 100 100 100 99 100 100 100 100 100 100 100 100 100 100 100 98 100 99 99


This is a preview of a remote PDF: http://newprairiepress.org/cgi/viewcontent.cgi?article=7408&context=kaesrr

R. Currie, P. Geier. Resicore and Glyphosate Application Timings in Corn, Kansas Agricultural Experiment Station Research Reports, 2017,