Download or read book Weed Management in Cotton with Postemergence Directed Herbicide Applications written by Jill Schroeder and published by . This book was released on 1993 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Chemical Mechanical and Economic Relationships of Weed Control Methods Used in Mississippi Cotton written by Charles Edward Snipes and published by . This book was released on 1992 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Comparison of Directed and Topical Applications of Herbicides for Weed Control in Cotton written by Charles Wayne Hogue and published by . This book was released on 1971 with total page 2 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Handbook of Weed Management Systems written by Albert E. Smith and published by Routledge. This book was released on 2017-11-22 with total page 768 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work provides the fundamental information necessary for the development of weed management strategies for all the major US crops using concepts that can be applied worldwide. Weed management systems are provided for cotton, peanut, soybean, wheat, barley, oat, sorghum, rice, fruits, nut crops, and more. The dynamics involved in creating the best management approaches for specific types of crops are explained.
Download or read book Cotton s Response to Combinations of Mepiquat Chloride Pyrithiobac and CGA 362622 written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Agronomic and cultural practices have been developed to manipulate the indeterminate growth habit and perennial nature of cotton (Gossypium hirsutum L.) to facilitate management and production as an annual crop. The regulation of excessive vegetative growth and redirection of photoassimilates toward reproductive growth has been most successful with the plant growth regulator mepiquat chloride (MC). Mepiquat chloride decreases growth; thereby creating a more compact plant by controlling plant height and main-stem node development. Weed management in cotton has historically been implemented by the use of preemergence, post-directed, and layby herbicides. Postemergence over-the-top (POST) broadleaf herbicides have not been an option for weed management in cotton until the recent registrations of pyrithiobac and CGA 362622. Both compounds are members of herbicide families that inhibit acetolactate synthase in susceptible plants. These herbicides control a range of troublesome weeds in cotton, while cotton tolerance to POST treatments has been observed. Pyrithiobac and CGA 362622 are registered for use on nontransgenic and transgenic cotton including glyphosate-resistant cotton. Current glyphosate POST applications are prohibited after the 4-leaf stage in glyphosate-resistant cotton, whereas pyrithiobac and CGA 362622 POST are allowed after the 4-leaf stage in nontransgenic and transgenic cotton. The application of these herbicides in a tank mixture with MC could be beneficial for cotton producers. However, research has not been conducted to evaluate cotton response to tank mixtures of MC with pyrithiobac and CGA 362622. Field studies were conducted in 2002 and 2003 near Goldsboro and Rocky Mount, NC. Treatments were applied to 9- to 10-leaf cotton and arranged in a randomized complete block design with four replications. Treatments consisted of MC rates of 0, 11.8 and 23.6 g ai ha-1 in a factorial arrangement with herbicide treatments of untreated, pyrithiobac at 75 g a.
Download or read book Mitigation of Herbicide Resistance Development Among Weed Species in Cotton and Peanut written by Justin Scott Calhoun and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Herbicide resistance development among weed populations in cotton and peanut is becoming increasingly difficult to manage. If resistant populations continue to persist, weed control practices for producers will become less efficient and more costly. The objective of this research was to evaluate alternative weed control techniques designed to mitigate herbicide resistance development for their agronomic and economic impact on weed management systems. Studies were conducted in 2019, 2020, and 2021 at multiple locations in Mississippi and Arkansas investigating multiple techniques including the addition of soil surfactants in herbicide tank mixtures, increasing SOAs utilized in peanut herbicide programs, applying non-labeled herbicides to cotton with post-directed spray placement, and applying complete residual herbicide programs in cotton. Our results suggests that some novel strategies incorporated into existing weed management programs, can provide sufficient control of troublesome weed species and conserve crop yield and profit returns. For example, the use of post-directed application placement allowed for non-labeled herbicides to be applied to cotton without detrimental effects, thus increasing potential options for POST weed control within that crop. Additionally, weed control, seed cotton yield, and net returns were not affected when only residual herbicides were applied in season-long weed control programs as opposed to the standard of mixed, foliar and residual programs. This indicates that high selection pressure associated with foliar chemistries which leads to resistance development, can be alleviated through the adoption of alternative strategies.
Download or read book Chemical Weed Control in Cotton written by Walter Kenneth Porter and published by . This book was released on 1957 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Weed Control in Cotton written by and published by . This book was released on 1960 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Stewarding 2 4 D and Dicamba Based Weed Control Technologies in Cotton and Soybean Production Systems written by John Tyler Buol and published by . This book was released on 2019 with total page 239 pages. Available in PDF, EPUB and Kindle. Book excerpt: Distinguishing 2,4-D and dicamba herbicide formulations in cotton and soybean tissue is challenging in regulation of crop injury from these herbicides. Additionally, stewardship of 2,4- D and dicamba technologies is important to maximize their longevity and efficacy. Research was conducted to (1) characterize cotton and soybean response to various formulations of 2,4-D or dicamba with or without glyphosate, (2) develop a method for classifying these formulations in crop tissue, and (3) optimize use of chloroacetamide herbicides in dicamba systems for mitigation of selection pressure on dicamba. Formulations evaluated include dicamba diglycolamine (DGA), dimethylamine (DMA), N,N-Bis-(3-aminopropyl) methylamine (BAPMA), and DGA plus potassium acetate (KAc); and 2,4-D DMA, acid, isooctyl ester (ESTER), and choline. Weed management by the chloroacetamides s-metolachlor and acetochlor was evaluated with applications preemergence (PRE), early postemergence (EP), late postemergence (LP), PRE followed by (fb) EP, PRE fb LP, and EP fb LP. Cotton and soybean response differed by 2,4-D and dicamba formulation, and glyphosate presence. Cotton yield was reduced by 200 to 500 kg ha−1 following exposure to 2,4-D choline or DMA relative to acid or ESTER. Glyphosate presence led to a reduction in cotton and soybean yield of 377 and 572 kg ha−1, respectively. Exposure to dicamba DMA resulted in a 263 kg ha−1 reduction in soybean yield relative to dicamba DGA, and glyphosate presence reduced yield by 439 and 246 kg ha−1 in cotton and soybeans, respectively. Chemometric analyses generated models capable of up to 85% accuracy in identifying dicamba formulation in cotton and soybean tissue, and up to 80% accuracy in identifying 2,4-D formulation. Split chloroacetamide applications improved cotton yield up to 60%, reduced weed densities up to 90%, and improved control up to 56% relative to single applications. Cotton height was reduced up to 23% if a single chloroacetamide application was made. Soybean yield was maximized following any chloroacetamide application timing except PRE alone, and weed control was reduced up to 31% following single chloroacetamide application relative to split applications. These results will aid regulatory bodies in managing use of new weed control technologies and will assist producers in stewarding these new technologies.
Download or read book Weeds of Cotton written by C. G. McWhorter and published by . This book was released on 1992 with total page 666 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Conservation tillage Systems for Cotton written by Arkansas Agricultural Experiment Station and published by . This book was released on 1993 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Evaluation of Weed Management and the Agronomic Utility of Cotton Grown on a 15 Inch Row Configuration and the Biology and Ecology of Doveweed written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: For more than a century, farmers planted cotton in rows spaced 91-cm or more apart. Row spacing was dictated primarily by equipment for cultivation, which was initially draft animals and later, tractors. Harvesting equipment also was designed to accommodate these wide row spacings. Recent advances in technology, especially herbicide-resistant cotton and the ability to spindle-pick cotton in 38-cm rows, have increased the potential for cotton production in narrow rows. Field experiments were conducted to evaluate weed management systems in glufosinate-resistant cotton planted in 38- and 97-cm rows. Greater than 90% control of annual grasses and Amaranthus spp. in 2004 and Ipomoea spp. in both years was obtained in narrow-row cotton receiving glufosinate applied early postemergence (EPOST) and mid-postemergence (MPOST) to 2- and 6-leaf cotton, respectively. With good early season control by glufosinate and rapid canopy closure, there was little benefit from pendimethalin, fluometuron, or pyrithiobac applied preemergence (PRE), S-metolachlor or pyrithiobac mixed with glufosinate applied MPOST, or trifloxysulfuron applied late postemergence (LPOST) to 11-leaf cotton. In 2005, glufosinate alone applied EPOST and MPOST did not adequately control annual grasses and Amaranthus spp. Pendimethalin applied PRE alone or mixed with fluometuron or pyrithiobac increased control to greater than 90% and increased yields 59 to 75%. Pendimethalin PRE followed by S-metolachlor or pyrithiobac mixed with glufosinate at MPOST was no more effective than pendimethalin alone. Without PRE herbicides, trifloxysulfuron applied LPOST increased Amaranthus but not annual grass control. Cotton row spacing had no effect on cotton yield and little effect on weed control. Weed control and yield in narrow-row cotton with a PRE herbicide plus glufosinate applied twice was similar to that in wide-row cotton with a PRE herbicide, glufosinate applied twice, and trifloxysulfuron plus prometryn plus MSMA app.
Download or read book Evalutation of Weed Management in Glyphosate Resistant Corn Zea Mays as Affected by Preemergence Herbicide Timing of Postemergence Herbicide Application and Glyphosate Products written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Physiology of Growth and Allelopathy of Cotton written by Abeer Hamad and published by LAP Lambert Academic Publishing. This book was released on 2011-09-01 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt: The critical period of weed control is an important concept in Integrated Weed Management (IWM) systems. This period has been defined as an interval in the life cycle of the crop when it must be kept weed-free to prevent yield loss. This concept helps in determining the most effective time for non-residual postemergent herbicide applications, and reduces the practice of season-long residual herbicides, and unnecessary late applications of herbicides.In central Greece, cotton is primarily grown as a spring-seeded, annual crop. The advent of soil-residual herbicides and the increased use of herbicide-tolerant cultivars have increased the reliance on herbicides for the control of weeds in this crop. Therefore, in the first part of this book the critical period of weed control in cotton at three nitrogen levels in central Greece was identified. In other hand, in the second part of this book the allelopathic effects of redroot pigweed (Amaranthus retroflexus L.) on cotton and some other crops was investigated, where redroot pigweed is considered as a highly problematic weed in cotton fields in Greece by using different procedures.
Download or read book Weed Management Strategies in Conventional and Reduced tillage Cotton Production Systems written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Laboratory and greenhouse studies were conducted to determine the effect of temperature, solution pH, water stress, and planting depth on cutleaf eveningprimrose germination. Field studies were conducted to measure growth parameters of cutleaf eveningprimrose throughout the fall season. When treated with constant temperature, the optimum germination of cutleaf eveningprimrose occurred at 24 C. Onset, rate, and total germination were greatest in an alternating 20D 5 C temperature regime. Germination decreased as solution pH increased. Germination decreased when seed was subjected to increased water stress. Emergence was optimum when seed were buried at depths of 0.5 cm. Cutleaf eveningprimrose control was maximized when 2, 4-D was applied in mixture with glyphosate or paraquat. Five studies were conducted at Clayton, Rocky Mount, and Lewiston-Woodville, NC, in 2001 and 2002, to evaluate weed management, crop tolerance, and yield in strip- and conventional-tillage glyphosate-resistant cotton. The addition of S-metolachlor to either glyphosate formulation increased control of broadleaf signalgrass, goosegrass, large crabgrass, and yellow foxtail 14 to 43% compared to control with glyphosate alone. S-metolachlor was not beneficial for late season control of entireleaf morningglory, jimsonweed, pitted morningglory, or yellow nutsedge. The addition of S-metolachlor to either glyphosate formulation increased control of common lambsquarters, common ragweed, Palmer amaranth, smooth pigweed, and velvetleaf 6 to 46%. The addition of a late postemergence-directed spray (LAYBY) treatment of prometryn plus MSMA increased control to greater than 95% for all weed species regardless of early-postemergence (EPOST) treatment, and control was similar with or without S-metolachlor EPOST. Cotton lint yield was increased 220 kgD a with the addition of S-metolachlor to either glyphosate formulation compared to yield from glyphosate alone. Addition of the LAYBY increased yields.
Download or read book Integrated Weed Management for Sustainable Agriculture written by Robert Zimdahl and published by Burleigh Dodds Series in Agric. This book was released on 2017-12-14 with total page 476 pages. Available in PDF, EPUB and Kindle. Book excerpt: Weeds remain a major obstacle to improved yields in agriculture. At the same time, established methods of control are being undermined by problems such as herbicide resistance. This major collection reviews key developments in integrated weed management (IWM) to manage weeds more sustainably.
Download or read book Herbicides written by Andrew Price and published by BoD – Books on Demand. This book was released on 2013-06-12 with total page 666 pages. Available in PDF, EPUB and Kindle. Book excerpt: Herbicide use is a common component of many weed management strategies in both agricultural and non-crop settings. However, herbicide use practices and recommendations are continuously updated and revised to provide control of ever-changing weed compositions and to preserve efficacy of current weed control options. Herbicides - Current Research and Case Studies in Use provides information about current trends in herbicide use and weed control in different land and aquatic settings as well as case studies in particular weed control situations.
