Download or read book The Residual Effects of Four Selective Herbicides Upon the Growth and Development of Winter Cover Crops written by Alvin D. Rutledge and published by . This book was released on 1967 with total page 65 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effect of Herbicide Residues on Spring and Fall seeded Cover Crops written by Li Yu and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Managing Cover Crops Profitably 3rd Ed written by Andy Clark and published by DIANE Publishing. This book was released on 2008-07 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cover crops slow erosion, improve soil, smother weeds, enhance nutrient and moisture availability, help control many pests and bring a host of other benefits to your farm. At the same time, they can reduce costs, increase profits and even create new sources of income. You¿ll reap dividends on your cover crop investments for years, since their benefits accumulate over the long term. This book will help you find which ones are right for you. Captures farmer and other research results from the past ten years. The authors verified the info. from the 2nd ed., added new results and updated farmer profiles and research data, and added 2 chap. Includes maps and charts, detailed narratives about individual cover crop species, and chap. about aspects of cover cropping.
Download or read book Non Chemical Weed Control written by Khawar Jabran and published by Academic Press. This book was released on 2018-01-03 with total page 174 pages. Available in PDF, EPUB and Kindle. Book excerpt: Non-Chemical Weed Control is the first book to present an overview of plant crop protection against non-food plants using non-chemical means. Plants growing wild—particularly unwanted plants found in cultivated ground to the exclusion of the desired crop—have been treated with herbicides and chemical treatments in the past. As concern over environmental, food and consumer safety increases, research has turned to alternatives, including the use of cover crops, thermal treatments and biotechnology to reduce and eliminate unwanted plants. This book provides insight into existing and emerging alternative crop protection methods and includes lessons learned from past methodologies. As crop production resources decline while consumer concerns over safety increase, the effective control of weeds is imperative to insure the maximum possible levels of soil, sunlight and nutrients reach the crop plants. - Allows reader to identify the most appropriate solution based on their individual use or case - Provides researchers, students and growers with current concepts regarding the use of modern, environment-friendly weed control techniques - Presents methods of weed management—an important part of integrated weed management in the future - Exploits the knowledge gained from past sustainable weed management efforts
Download or read book Bibliography of Agriculture written by and published by . This book was released on 1976 with total page 1732 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Winter Cover Crop Impacts on Weed Dynamics in Eastern and Central Nebraska written by Elizabeth Ann Oys and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Reducing tillage in cropping systems causes weed management to be dependent on chemical and cultural methods for weed control. Over time, herbicide-resistant weeds have developed due to the continuous selection pressures from herbicides, particularly in the Midwest Corn Belt. Integrated weed management strategies, such as cover crops, can be used to mitigate some of these issues. Cover crops are primarily known for their soil health benefits, but there is evidence that cover crops can suppress weeds. However, less research has been done at the field-scale level to address cover crop impacts on the weed seedbank and aboveground weeds during the growing season. In response, two experiments were designed to investigate above and belowground weeds in eastern and central Nebraska. The soil seedbank was germinated from soil samples and weed density and biomass were measured at two points during the growing season. Our results show that cover crops did not influence the total seedbank density, but increased the density of Amaranthus spp. seeds in the seedbank. Aboveground, reductions in weed density and biomass reductions occurred at two sites. More importantly, larger pigweed seedbank densities in the cover crop treatments were not expressed aboveground, signifying cover crop suppression of the weed seedbank through reduced germination withdrawals. This research provides insight on above and belowground weed dynamics under cover crops and shows that cover crops may be a viable integrated weed management tool for Amaranthus spp. management and mitigating risks of herbicide resistance over time by preventing seedbank withdrawals through germination.
Download or read book RESIDUAL HERBICIDE IMPACT ON COVER CROPS UTILIZED WITHIN CROPPING SYSTEMS FOR WEED SUPPRESSION written by Sydney Wardell Boersma and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Annual ryegrass (Lolium multiflorum Lam.), and red clover (Trifolium pratense L.) interseeded into V4 corn, and oilseed radish (Raphanus sativus var. oleiformis L.) planted after winter wheat harvest were evaluated for weed suppression. A concern with these practices is how the herbicide applied to the main crop will affect the establishment and growth of the cover crop, and whether the interseeded cover crop competes with the main crop. Experiments were conducted at two locations per study year (2016, 2017) at the University of Guelph Ridgetown Campus. S-metolachlor/mesotrione/atrazine, S-metolachlor/mesotrione/bicyclopyrone and S-metolachlor/mesotrione/bicyclopyrone/atrazine applied preemergence (PRE) caused 91-99% red clover, and 74-94% annual ryegrass injury. S-metolachlor, atrazine and S-metolachlor/atrazine, applied PRE caused 73 to 86%,
Download or read book Diagnosis of Herbicide Damage to Crops written by David J. Eagle and published by CHS Press. This book was released on 1981 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Plant Protection Quarterly written by and published by . This book was released on 1996 with total page 762 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A History of Weed Science in the United States written by Robert L Zimdahl and published by Elsevier. This book was released on 2010-02-04 with total page 220 pages. Available in PDF, EPUB and Kindle. Book excerpt: It is important that scientists think about and know their history - where they came from, what they have accomplished, and how these may affect the future. Weed scientists, similar to scientists in many technological disciplines, have not sought historical reflection. The technological world asks for results and for progress. Achievement is important not, in general, the road that leads to achievement. What was new yesterday is routine today, and what is described as revolutionary today may be considered antiquated tomorrow. Weed science has been strongly influenced by technology developed by supporting industries, subsequently employed in research and, ultimately, used by farmers and crop growers. The science has focused on results and progress. Scientists have been--and the majority remain--problem solvers whose solutions have evolved as rapidly as have the new weed problems needing solutions. In a more formal sense, weed scientists have been adherents of the instrumental ideology of modern science. That is an analysis of their work, and their orientation reveals the strong emphasis on practical, useful knowledge; on know how. The opposite, and frequently complementary orientation, that has been missing from weed science is an emphasis on contemplative knowledge; that is, knowing why. This book expands on and analyzes how these orientations have affected weed science's development. - The first analytical history of weed science to be written - Compares the development of weed science, entomology and plant pathology - Identifies the primary founders of weed science and describes their role
Download or read book Ecological Management of Agricultural Weeds written by Matt Liebman and published by Cambridge University Press. This book was released on 2001-07-19 with total page 546 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents principles and practices for ecologically based weed management in a wide range of temperate and tropical farming systems. Special attention is given to the evolutionary challenges that weeds pose and the roles that farmers can play in the development of new weed-management strategies.
Download or read book Alfalfa Management Guide written by D. J. Undersander and published by . This book was released on 2011 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Alfalfa Management Guide is designed especially for busy growers, with to-the-point recommendations, useful images of diseased plants and pests, and quick-reference tables and charts. Revised in 2011, this edition of Alfalfa Management Guide covers the latest strategies for alfalfa establishment, production, and harvest-soil testing, fertilizing, integrated pest management, rotation, and more.
Download or read book WEED MGMT IN AGROECOSYSTEMS written by Miguel A. Altieri and published by Springer. This book was released on 1988-08-31 with total page 370 pages. Available in PDF, EPUB and Kindle. Book excerpt: The chapters of this book describe the physiological, population and community ecology of weeds within agroecosystems, with the goal of recognizing details of relevant approaches for better weed management
Download or read book Agrindex written by and published by . This book was released on 1995 with total page 964 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book QUANTIFYING RELATIVE SENSITIVITIES OF COVER CROPS TO CORN HERBICIDES TO REFINE COVER CROP INTERSEEDING PRACTICES written by Tosh Mazzone and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Few studies have quantified differences in the sensitivity of cover crop species to corn herbicide programs. Differences in corn herbicide efficacy on weed species can be categorized broadly by activity on taxonomic groups or species traits within taxonomic groups, such as seed mass, which are also likely sources of variation in cover crop sensitivity to herbicides. To improve cover crop species selection for interseeding, including the design of mixtures, dose-response assays were conducted from 2020-2022 at University Park, Pennsylvania. Relative sensitivity was quantified for twelve cover crop species within four taxonomic groups that ranged in seed mass within taxonomic group, in response to triazine (atrazine; Group 5 herbicide) and triazine/HPPD inhibiting herbicide programs (mesotrione, isoxaflutole, tembotrione, topramezone, tolpyralate; Group 27 herbicides). Nonlinear dose-response curves were fit to standardized biomass data and absolute ED50 coefficients were extracted for each cover crop by herbicide model. Results showed that cover crops exhibited low sensitivity to atrazine across taxonomic groups and seed sizes, and except for small-seeded legumes (medium red clover, crimson clover). In comparison, most cover crop species were sensitive to mesotrione/atrazine and isoxaflutole/atrazine, with absolute ED50 estimates at low soil concentrations. Intermediate sensitivity to tembotrione/atrazine was observed across all cover crop species, with annual ryegrass being the least sensitive species. Relative sensitivity of cover crop species to topramezone/atrazine and tolpyralate/atrazine were lower than other atrazine/HPPD programs, with brassica and large-seeded legume species ranking the least sensitive. These results demonstrate meaningful variation in cover crop species sensitivity to corn herbicides among taxonomic groups and seed mass within taxonomic groups. Relative rankings of sensitivity to atrazine or atrazine/HPPD herbicides generated from dose response models can be used to design cover crop mixtures with similar levels of tolerance, or identify species with greater risk of injury, to commonly used corn herbicides. Two complementary field experiments were conducted from 2021-2022 at three locations (Rock Springs, PA; Landisville, PA; Aurora, NY) to study the effect of PRE and POST herbicides that ranged in expected soil residual activity on interseeded cover crop mixtures that ranged in taxonomic group and seed mass. Herbicide treatment effects on cover crop and weed abundance were evaluated during the cover crop establishment phase and prior to corn harvest to measure persistence and composition of cover crop mixtures. In the PRE experiment, biomass of the small-seeded mixture composed of annual ryegrass, medium red clover and rapeseed during the establishment phase was lower and composition was more variable in the long-lived residual herbicide treatment compared to the large-seeded mixture. In comparison, herbicide treatments did not affect the large-seeded cover crop mixture composed of cereal rye, cowpea and daikon radish in the establishment phase. By corn dry down, the small-seeded mixture biomass production was negatively impacted where short-lived PRE herbicides failed to control weeds, while the large-seeded mixture produced greater biomass, but cereal rye failed to persist at five out of six site-years. Greenhouse bioassays and complementary field-based studies demonstrate that cover crop sensitivity to frequently used soil-applied herbicides (atrazine/HPPD) in corn systems differ among taxonomic group and, in some cases, seed mass within taxonomic groups. In general, small-seeded legumes are at greater risk for injury than large-seeded legumes to these herbicides. Field experiments also demonstrate that species selection for interseeding systems requires consideration of both herbicide tolerance and environmental stress tolerance to optimize conservation benefits.
Download or read book Optimizing Residual Herbicides in Mid south Cropping Systems written by Benjamin P. Sperry and published by . This book was released on 2019 with total page 135 pages. Available in PDF, EPUB and Kindle. Book excerpt: Adoption of conservation tillage and the use of cover crops for benefits associated with soil health and weed control has increased in recent years. In these systems, the reliance on postemergent (POST) herbicides such as glyphosate has resulted in widespread resistance in weeds. Consequently, residual herbicides must also be used in conjunction with conservation tillage practices and POST herbicides to reduce risk of further resistance evolution. However, residual herbicide applications to crop residue covered soil commonly results in herbicide losses of up to 50% due to interception and adsorption to organic matter (OM). Therefore, greenhouse and field experiments were conducted in 2017 and 2018 in effort to identify application methods and other practices that result in greater efficacy when residual herbicides are applied to crop residue. In the field, efficacy of residual herbicides after application to crop residue-covered soils was enhanced with increasing carrier volumes and most herbicides performed better with XR nozzles compared to TTI nozzles. However, minimum carrier volumes and nozzles required for successful weed control were largely product-specific. In a greenhouse experiment, the addition of a silicone-based adjuvant at an optimal concentration improved acetochlor efficacy after application to wheat straw. Likewise, acetochlor efficacy from application to wheat straw was increased with greater volumes of simulated rainfall. In addition to conservation tillage related experiments, field experiments were conducted in 2017 and 2018 in Mississippi and Nebraska to quantify the relative duration of weed control provided by many commonly used residual herbicides in effort to identify when weed control starts to decline relative to initial application. Lastly, a field experiment was conducted investigating the effects of carrier volume and spray quality in simulated dicamba drift on susceptible soybean experiments. Carrier volume was found to profoundly affect soybean response to dicamba and should be considered in future simulated drift studies.
Download or read book Herbicide Resistance in Weeds and Crops written by J. C. Caseley and published by Elsevier. This book was released on 2013-10-22 with total page 526 pages. Available in PDF, EPUB and Kindle. Book excerpt: Herbicide Resistance in Weeds and Crops is a collection of papers presented at the 11th Long Ashton International Symposium in September 1989. The said symposium is held to study about the increasing incidence of herbicide-resistant weeds and the consideration of the production of herbicide-resistant crops. The book includes studies that suggest the delay and prevention of herbicide resistance; the gravity of the infestation of different herbicide-resistant weed; the management of herbicide resistance; and the mechanisms of herbicide tolerance. Also covered in the book are the improvement of different herbicides, as well as the prospective development of genetically engineered herbicide-resistant plants. Botanists, biochemists, and farmers would greatly benefit from the text, especially those who would like to explore and study the phenomenon.
