G93-1158 Questions and Answers about Atrazine

This NebGuide addresses some of the current concerns about atrazine and water quality. Included are some questions and answers about atrazine regarding toxicity, EPA guidelines, presence in water supplies, weed resistance and best management practices. What is atrazine? Atrazine is a herbicide that selectively controls broadleaf (dicot) weeds, such as pigweed, cocklebur, velvetleaf and certain grass weeds in fields of corn and sorghum. Selective control means that the target weeds are controlled, with little or no injury to the crop. Atrazine is well tolerated by actively growing corn and sorghum, which absorb and metabolize the herbicide and thereby detoxify it

G83-681 Velvetleaf

This NebGuide provides guidelines on how to control velvetleaf by prevention, cultural and mechanical methods, and by use of recommended herbicides. Velvetleaf (Abutilon theophrasti Medic.), a member of the Mallow family, is related to cotton, hollyhocks, and numerous weeds. Other common names include buttonweed, Indian mallow, butterprint, piemarker, velvetweed, and cottonweed. The preferred name, velvetleaf, amply describes its velvety-textured, hairy-surfaced leaves. A native of China and presumably introduced into the U.S. from India as a fiber crop, this annual weed is adapted to cropland throughout most of the United States. Over the past 10 years, velvetleaf has increased dramatically in Nebraska and is now considered one of our most troublesome weeds

EC85-130 A 1985 Guide for Herbicide Use in Nebraska

Extension Circular 85-130: This is the 1985 guide for herbicide use in Nebraska. This circular deals principally with herbicides as an aid for crop production. The suggestions for use are based on results at Nebraska research stations and elsewhere

EC91-130 A 1991 Guide for Herbicide Use in Nebraska

Extension Circular 91-130: This circular is the guide to herbicide use in Nebraska Farming (1991)

EC87-130 A 1987 Guide for Herbicide Use in Nebraska

Extension circular 87-130 is a 1987 guide for herbicide use in Nebraska

G92-1071 Ridge Plant Systems: Weed Control

Advantages and disadvantages of the ridge plant system, weed control before and at planting and economics of the system are discussed. Ridge planting combines tillage and herbicides to achieve improved weed control in row crops. Crop seed is planted into ridges formed during cultivation and/or ditching of the previous crop. In ridge planting, the planter follows the old row and ridge clearing sweeps or disks move the surface soil, residue and much of the weed seed out of the row. Weed seeds are deposited between the rows where, upon germination, they can be controlled with cultivation. Two cultivations are generally used for weed control. The first cultivation loosens the soil and the second rebuilds the ridge. The ridge plant system is well suited to furrow-irrigationd crops. It also works well with dryland crops or those under center pivot irrigation. On furrow irrigationd land, corn or sorghum stalks may need to be shredded to assist in decomposition and hence irrigation because crop residue slows water advance in the furrow. Slowing the water may be a benefit, however, on soils which have a low water intake rate. With center pivot and dryland acres the need for shredding depends on how much residue the cultivator can handle

G92-1071 Ridge Plant Systems: Weed Control

Advantages and disadvantages of the ridge plant system, weed control before and at planting and economics of the system are discussed. Ridge planting combines tillage and herbicides to achieve improved weed control in row crops. Crop seed is planted into ridges formed during cultivation and/or ditching of the previous crop. In ridge planting, the planter follows the old row and ridge clearing sweeps or disks move the surface soil, residue and much of the weed seed out of the row. Weed seeds are deposited between the rows where, upon germination, they can be controlled with cultivation. Two cultivations are generally used for weed control. The first cultivation loosens the soil and the second rebuilds the ridge. The ridge plant system is well suited to furrow-irrigationd crops. It also works well with dryland crops or those under center pivot irrigation. On furrow irrigationd land, corn or sorghum stalks may need to be shredded to assist in decomposition and hence irrigation because crop residue slows water advance in the furrow. Slowing the water may be a benefit, however, on soils which have a low water intake rate. With center pivot and dryland acres the need for shredding depends on how much residue the cultivator can handle

NF539 Yield Suppressions of Glyphosate-Resistant (Roundup Ready) Soybeans

Research description and results of testing for effect of glyphosate herbicide application and the effect of the glyphosate-resistant gene in soybean production. Glyphosate is a popular postemergence herbicide. Glyphosate-resistant soybean technology is gaining acceptance in Nebraska and in U.S. cropping systems; however, potential yield suppression from either genetic differences among varieties, the glyphosate-resistant gene/gene insertion process, or glyphosate is a concern. The first of these could contribute to a yield lag; the latter two could contribute to a yield drag. Research Goals We designed experiments to test for both elements of yield drag: the effect of glyphosate herbicide application and the effect of the glyphosate-resistant gene. Since we could not distinguish between yield drag associated with the glyphosate-resistant gene or effects of its insertion, reference to this gene in the following could mean either or both of these possibilities. Two experiments were conducted at each of four Nebraska locations for two years with the intent to: 1) investigate the glyphosate herbicide effect on 12-13 varieties; and 2) look at the effect of the glyphosate-resistant (glyphosate-resistant) gene on five pairs of glyphosate- resistant, nonglyphosate-resistant sister cultivars (eight other cultivars were included as checks). Summary: Yield suppressions were observed. Yield drag from glyphosate application was not observed. Yield drag from glyphosate-resistant gene = 5 percent. Yield lag from variety genetic differences =

Guide for Weed Management in Nebraska

Each year we strive to provide a publication that is updated, informative, and easy to use. Last year’s edition has been revised to include the latest research-based information and several new sections outlined below. We hope you find these revisions useful and that they make this guide an even better resource than the previous edition

EC05-130 Guide for Weed Management in Nebraska

One of the major thrusts of all University of Nebraska weed science faculty is the Guide for Weed Management in Nebraska. This guide is not just the work of one or two people, rather it is a joint effort of all the authors to produce a comprehensive, information-packed resource. Each weed science faculty member is responsible for particular sections of the guide. The process of reviewing the current content, checking labels and research data and updating the content can be an extensive process. Each year new herbicide active ingredients and trade names are introduced and figuring out what a herbicide is and what it can control can be a sizeable task. The authors also meet twice a year to discuss feedback from readers, how the current guide is being used, and what changes should be made in the future. This circular deals principally with herbicides as an aid for crop production. The suggestions for use are based on results at Nebraska research centers and elsewhere. Consult product labels for additional information