Integrating Herbicide Resistant Corn (Zea Mays) Into Weed Management Systems for Michigan PDF Download
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Author: Brent Edward Tharp
Publisher:
ISBN:
Category : Corn
Languages : en
Pages : 260
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Author: Brent Edward Tharp
Publisher:
ISBN:
Category : Corn
Languages : en
Pages : 260
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Author: Karen A. Zuver
Publisher:
ISBN:
Category : Corn
Languages : en
Pages : 92
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Cotton and soybean resistant to glyphosate are widely planted in the United States. Ninety-five percent of the cotton and 85% of the soybean in North Carolina is glyphosate-resistant (GR). Rapid adoption of the technology is attributed to broad spectrum weed control, convenience of glyphosate-based weed management systems, and greater rotational crop flexibility. Corn resistant to glyphosate is less widely grown, but plantings are expected to increase. Wide-spread planting of GR crops in the United States and glyphosate patent expiration has led to a proliferation of glyphosate products. Growers have questioned their advisors on efficacy and crop tolerance of many of these products. Field experiments were conducted to evaluate 10 glyphosate products, representing isopropylamine, diammonium, and potassium salts, applied postemergence (POST) and postemergence-directed (PDIR) at 630 and 1680 g ae/ha for GR corn and GR cotton tolerance and weed control. There were no differences among products for control of six annual grass and 10 annual broadleaf weed species. No injury to corn from any glyphosate product at 630 or 1680 g/ha or to cotton from 630 g/ha was noted at any of seven locations. ClearOut 41 Plus"! an isopropylamine salt of glyphosate, and Roundup WEATHERMAX"! a potassium salt of glyphosate, applied POST at 1680 g/ha injured cotton 27 to 30% and 10 to 17%, respectively, at 3 of 7 locations. No cotton injury was noted with Glyfos®, Glyfos® X-TRA, Glyphomax"! Gly Star"!Original, Roundup Original"! Roundup UltraMAX®, Touchdown®, or Touchdown Total"! No differences were noted among glyphosate products or between rates for corn or cotton yield or cotton fiber properties. Field studies were conducted at six sites during 2002 and 2003 to evaluate weed control and glyphosate-resistant corn response to glyphosate and nicosulfuron plus atrazine applied POST as affected by PRE herbicide and timing of POST herbicide.
Author: Chad Lee Smith
Publisher:
ISBN:
Category : Corn
Languages : en
Pages : 107
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Book Description
The advent of glyphosate-resistant corn in Missouri has changed traditional reemergence (PRE) followed by postemeregence (POST) herbicide programs to ones that predominately utilize glyphosate POST. POST only programs can allow early season weed competition. The objective was to determine the efficacy of one and two-pass programs using PRE and POST herbicides in glyphosate-resistant corn and to quantitate the nitrogen loss from various application timings in POST glyphosate weed control. The first study composed of one-pass and two-pass herbicide weed control programs. Weed control failures occurred 29% more often using one-pass systems compared to two-pass programs utilizing PREs and yield reductions occurred more often in one-pass systems. Overall, two-pass systems which included the use of a PRE herbicide resulted in more consistent weed control across all species than one-pass POST treatments. The second study consisted of PRE herbicide treatments to favor grass, broadleaf, or mixed weed populations at multiple glyphosate application timings. To document nitrogen loss, weed biomass, leaf chlorophyll meter readings, and stalk nitrate testing was measured. Grass weeds were more detrimental to yield than broadleaf weeds. Chlorophyll meter readings documented nitrogen deficiency between treatments. Corn leaf chlorophyll meter readings taken at tasseling correlated strongly to the resultant grain yield (R2 [greater than or equal to] .84). Higher year-end stalk nitrate accumulations were reflective of higher grain yield.
Author: Joel S. Lee
Publisher:
ISBN:
Category : Corn
Languages : en
Pages : 98
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Author: Arnold Bray Mashingaidze
Publisher:
ISBN:
Category : Corn
Languages : en
Pages : 216
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Span lang=EN-GB style='mso-ansi-language:EN-GB'It was concluded that cultural weed management techniques that enhance radiation capture by the crop were effective in suppressing weed growth and seed production and increasing crop yields and should be incorporated into smallholder farmer's production practices in a systematic manner as part of Integrated Weed Management and cropping system design.
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Author: Christy Leigh Sprague
Publisher:
ISBN:
Category : Corn
Languages : en
Pages : 226
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Author: Kathrin Schirmacher
Publisher:
ISBN:
Category : Corn
Languages : en
Pages : 212
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Author: Ayse Nur Ulusoy
Publisher:
ISBN:
Category : Corn
Languages : en
Pages : 104
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Book Description
A weed control program that utilizes PRE herbicides and ensures a timely post-emergence weed removal could protect growth and yield of corn. The use of pre-emergence (PRE) herbicides for weed control could reduce the need for multiple POST applications of glyphosate in glyphosate-tolerant (GT) corn and provide an additional mode of action for combating glyphosate-resistant weeds. Thus, field studies were conducted in 2017 and 2018 at Concord, NE with the following objectives develop weed management recommendations that considers soil applied herbicides and determine proper timing of glyphosate based on the crop growth stage. Therefore the material in this thesis is presented in three chapters: Chapter 1 outlines the integrated weed management, critical period of weed control, and pre-emergence (PRE) or post-emergence (POST) herbicide use in corn. Chapter 2 determines the critical time for weed removal in glyphosate-tolerant corn without pre-emergence (PRE) herbicide and atrazine or Verdict-Zidua applied pre-emergence (PRE). Chapter 3 determines how the timing of weed removal and PRE herbicides application could influence growth and yield of glyphosate-tolerant corn.
Author: Ann Marie Thompson
Publisher:
ISBN:
Category :
Languages : en
Pages : 176
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