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Workshop In Using Living Mulch Systems For Grain Crop Production, Palle Pedersen, Jodee Roland Dec 2004

Workshop In Using Living Mulch Systems For Grain Crop Production, Palle Pedersen, Jodee Roland

Integrated Crop Management News

Incorporation of perennial legumes and cover crops into our row cropping systems and reduction of tillage will reduce soil erosion and concurrent loss of phosphorous and nitrogen to the surface water. Kura clover (Trifolium ambiguum) is a relatively new forage legume in North America that can be used in a living mulch system. It has an excellent forage yield and is persistent under a wide range of soil and climatic environments. Iowa Department of Agriculture and Land Stewardship, and Integrated Farm/Livestock Management Demonstration Program, with the assistance of Iowa State University Extension, are currently funding a large on-farm demonstration ...


Commercial Pesticide Applicator Training Sessions For Spring 2005, James A. Fawcett, Virgil L. Schmitt Dec 2004

Commercial Pesticide Applicator Training Sessions For Spring 2005, James A. Fawcett, Virgil L. Schmitt

Integrated Crop Management News

With the arrival of Asian soybean rust in this country, many commercial applicators are adding agricultural diseases (category 1C) to their certification so that they can apply fungicides. Most agricultural commercial applicators are certified in Ag Weeds (category 1A), and many are certified in Ag Insects (category 1B), but not very many are certified in Ag Diseases (category 1C).


Resource Conservation Practices: Manure And Tillage Management, Mahdi Al-Kaisi, H. Mark Hanna, Mark A. Licht Dec 2004

Resource Conservation Practices: Manure And Tillage Management, Mahdi Al-Kaisi, H. Mark Hanna, Mark A. Licht

Agriculture and Environment Extension Publications

Adopting best management practices throughout an operation must take into consideration both manure application and tillage management.


Icm Conference December 1-2, 2004, Brent A. Pringnitz Nov 2004

Icm Conference December 1-2, 2004, Brent A. Pringnitz

Integrated Crop Management News

The 16th Annual Integrated Crop Management Conference (ICM) will be held December 1 and 2 at the Iowa State Center on the Iowa State University campus in Ames. Registration begins at 9:00 a.m. on December 1 in Stephens Auditorium, and the conference concludes at 4:00 p.m. on December 2. During the conference participants will hear of Iowa's expanding ethanol industry and the impact that will have on grain marketing and agronomics.


Soybean Rust First Detector Training Session Announced, Gregory L. Tylka, Brent A. Pringnitz Nov 2004

Soybean Rust First Detector Training Session Announced, Gregory L. Tylka, Brent A. Pringnitz

Integrated Crop Management News

Asian soybean rust is a topic of great interest among Iowa soybean growers and agribusiness. The Iowa Department of Agriculture and Land Stewardship, the Iowa Soybean Association and Promotion Board, and Iowa State University have formed the Iowa Soybean Rust Team and have developed a system in Iowa whereby soybean samples that are suspected of possibly being infected with soybean rust can be examined and passed through a sequence of trained personnel to offer Iowa soybean growers rapid and accurate identification of the disease.


Fourth Iowa Organic Conference A Success, Kathleen Delate Nov 2004

Fourth Iowa Organic Conference A Success, Kathleen Delate

Integrated Crop Management News

Stanley Johnson, vice-provost for Extension at Iowa State University, welcomed the crowd of 295 registrants at the Fourth Annual Iowa Organic Conference in the Scheman Building on Monday, November 1, 2004, to the home of the "best organic research and extension program in the United States," according to Rodale Press.


Glucose Reaction With Fumonisin B1 Partially Reduces Its Toxicity In Swine, Guillermo Fernandez-Surumay, Gary D. Osweiler, Michael Yaeger, Catherine C. Hauck, Suzanne Hendrich, Patricia A. Murphy Nov 2004

Glucose Reaction With Fumonisin B1 Partially Reduces Its Toxicity In Swine, Guillermo Fernandez-Surumay, Gary D. Osweiler, Michael Yaeger, Catherine C. Hauck, Suzanne Hendrich, Patricia A. Murphy

Food Science and Human Nutrition Publications

Acute and subacute intraperitoneal doses of fumonisin B1 (FB1) were administered to test the efficacy of the FB1-glucose reaction products in detoxifying FB1 in swine. In the acute study at 11 µmol of FB1/kg of body weight, five of six pigs administered FB1 and four of six pigs administered FB1- glucose died from acute pulmonary edema. Analysis of weight gain, serum aspartate aminotransferase and γ-glutamyltransferase, total cholesterol, and pathological evaluation did not provide evidence of protection against FB1 toxicity by the FB1-glucose reaction products. In the subacute study at 5.5 µmol of FB1/kg of body weight, one ...


2004 Ag Chemical Dealer Updates, Brent A. Pringnitz Oct 2004

2004 Ag Chemical Dealer Updates, Brent A. Pringnitz

Integrated Crop Management News

Crop production changes at a rapid pace. New products, label revisions, regulatory requirements, soil nutrient recommendations--just some of the items you need to stay up to date on to better serve your customers. The Ag Chemical Dealer Updates are designed to do just that. The Ag Chemical Dealer Updates are intended to deliver the latest crop production recommendations, news, and information directly from Iowa State University Extension.


High Prices And Tight Supply Make Fertilization Decisions Tough, John E. Sawyer Oct 2004

High Prices And Tight Supply Make Fertilization Decisions Tough, John E. Sawyer

Integrated Crop Management News

Nitrogen (N) fertilizer prices have been high the past few years, and continue to be this fall. Additionally, other fertilizer products have increased in price, with supply shortages of potassium (K) fertilizer possible. Why is this occurring? Several factors are interacting to influence both supply and price. These include high natural gas price (main feedstock for manufacture of N fertilizer), closure of about one-quarter of the U.S.


Residue Management After Harvest, Mahdi Al-Kaisi, H. Mark Hanna, Michael Tidman Oct 2004

Residue Management After Harvest, Mahdi Al-Kaisi, H. Mark Hanna, Michael Tidman

Integrated Crop Management News

As we are in the harvest season, producers are searching for the best way to manage their residue cover, particularly with corn. Some farmers manage their residue by chopping, bailing, or grazing in livestock operations. But before planning to use any of these options or others, and reducing corn residue cover after this year's harvest, one of the first things to plan for is the remaining crop residue coverage. With that in mind, producers need to ask themselves a series of questions.


Soil Samping For Future Manure Management Plans, Angela M. Rieck-Hinz Sep 2004

Soil Samping For Future Manure Management Plans, Angela M. Rieck-Hinz

Integrated Crop Management News

By the time this newsletter hits your mailbox, harvest season will have begun in Iowa and soil sampling will follow shortly behind the combines. Soil sampling is just one part of the soil testing process that eventually leads to fertilizer recommendations, and now soil sampling will be a requirement for those fields receiving manure as part of a state-required manure management plan using the new P-index plans as regulated by the Iowa Department of Natural Resources (IDNR).


The Role Of Pasture In Conservation Management, Mahdi Al-Kaisi, H. Mark Hanna, Michael Tidman Aug 2004

The Role Of Pasture In Conservation Management, Mahdi Al-Kaisi, H. Mark Hanna, Michael Tidman

Integrated Crop Management News

Pasture is a longtime and significant part of Iowa agriculture and is a critical component of the state's agricultural landscape. The main function of pasture is as a primary support system for livestock. It can affect conservation and the environmental planning in several ways, including soil carbon storage, soil quality, and water quality. The effect of livestock on such parameters is highly significant depending on the way livestock and pasture are managed. Therefore, pasture management does play an important role in a farming operation's overall conservation management plan.


Weed Ecology Field Day Is August 16, 2004, Robert G. Hartzler Aug 2004

Weed Ecology Field Day Is August 16, 2004, Robert G. Hartzler

Integrated Crop Management News

A field day focusing on the impacts of crop rotation on weed population dynamics will be held Monday, August 16, near Boone, Iowa. The event will be held at the site of a 21-acre experiment involving 3 crop rotations (corn - soybean; corn - soybean - small grain/red clover; corn - soybean - small grain/alfalfa - alfalfa). Information on why weeds respond differently to the rotation systems will be presented. Speakers include Matt Liebman, Bob Hartzler, and Andy Heggenstaller from the Iowa State University Department of Agronomy; weed management practitioners; and others. Refreshments will be served after the field day.


Soybean Cupping Prevalent In Iowa, Micheal D. Owen Jul 2004

Soybean Cupping Prevalent In Iowa, Micheal D. Owen

Integrated Crop Management News

Once again, we are getting many questions about soybean fields that have abruptly demonstrated symptoms resembling those attributable to a plant growth regulator (PGR) herbicide such as 2,4-D, dicamba, or clopyralid. Given this spring's windy conditions, there is no question that some drift occurred. Furthermore, with the limited "field time" available, it is surprising that sprayer contamination calls were not more prevalent.


Mesotrione Carryover To Soybeans, Micheal D. Owen Jul 2004

Mesotrione Carryover To Soybeans, Micheal D. Owen

Integrated Crop Management News

Mesotrione provides excellent residual control and breaks down readily in the soil provided there is sufficient moisture. Another important consideration is the rate of application, the timing of application, and soil characteristics likely influences the rate of degradation. Another possible consideration is the interaction of the atrazine included in Lumax with the mesotrione. Typically the mesotrione rate for a soil application of Callisto is approximately twice the rate when applied postemergence and is 0.24 and 0.1 lbs active ingredient/acre. The maximum rate of mesotrione in Lumax is 0.2 lbs active ingredient/acre.


Phylogenetic Relationships Among North American Popcorns And Their Evolutionary Links To Mexican And South American Popcorns, A. Santacruz-Varela, Mark P. Widrlechner, K. E. Ziegler, P. K. Bretting Jul 2004

Phylogenetic Relationships Among North American Popcorns And Their Evolutionary Links To Mexican And South American Popcorns, A. Santacruz-Varela, Mark P. Widrlechner, K. E. Ziegler, P. K. Bretting

NCRPIS Publications and Papers

To determine genetic relationships among representative popcorns (Zea mays L.) of the New World, 56 maize populations from the USA and nine Latin American countries were characterized for 29 morphological traits, 18 isozyme loci, and 31 SSR loci. Cluster and principal component analyses were performed upon standardized morphological data and allelic frequencies from isozyme and SSR loci to elucidate relationships among populations within a geographical and historical context. Three groups of popcorn, with distinctive morphological characteristics and genetic profiles, were identified in the North American populations. The first group includes the North American Yellow Pearl Popcorns, which are currently the ...


Calibrating Liquid Tank Manure Applicators, Kapil Arora, Mark A. Licht, Kris Kohl, Joel L. Dejong Jul 2004

Calibrating Liquid Tank Manure Applicators, Kapil Arora, Mark A. Licht, Kris Kohl, Joel L. Dejong

Agriculture and Environment Extension Publications

Why and how to calibrate liquid tank manure applicaors is discussed. A comprehensive worksheet is provided.


Crop Diagnostic Clinic Registration Now Open, Brent A. Pringnitz Jun 2004

Crop Diagnostic Clinic Registration Now Open, Brent A. Pringnitz

Integrated Crop Management News

Registration is now underway for the 2004 Crop Diagnostic Clinics at the Field Extension Education Laboratory (FEEL). These clinics provide an opportunity for clients to interact with Iowa State University specialists and receive hands-on training in a variety of crop management areas.


Conservation Buffers Can Improve Water Quality, Mahdi Al-Kaisi, H. Mark Hanna, Michael Tidman Jun 2004

Conservation Buffers Can Improve Water Quality, Mahdi Al-Kaisi, H. Mark Hanna, Michael Tidman

Integrated Crop Management News

Conservation buffers are areas or strips of land where permanent vegetation is established in and around row crop fields to protect environmentally sensitive areas such as streams and tributaries; thus, these buffers are important for improving water quality.


Spring Rain And Soil Erosion, Mahdi Al-Kaisi, H. Mark Hanna, Mark A. Licht Jun 2004

Spring Rain And Soil Erosion, Mahdi Al-Kaisi, H. Mark Hanna, Mark A. Licht

Integrated Crop Management News

Spring rains can come hard and fast as we experienced last week, causing substantial soil erosion when soils are most vulnerable because of degraded crop residue cover, soil preparation by tillage, and no crop canopy. The soil profiles in most of Iowa are now filled to capacity with water. The profiles are at or near saturation. Therefore, the intensity and amount of rain we received have exceeded the soil capacity to filter water and minimize surface runoff even in fields with the most adequate conservation practices.


Nitrogen Losses After The Heavy Rains, John E. Sawyer Jun 2004

Nitrogen Losses After The Heavy Rains, John E. Sawyer

Integrated Crop Management News

The recent heavy rains have raised questions about nitrogen (N) losses. In wet field areas it is common to find off-color corn, but that does not necessarily equate to N shortage. So be careful as you initially are seeing plant response to wet conditions (slowed root activity and growth). The amount of N taken up by corn to the V6 stage is small (about 20 pounds N per acre, so pale-yellow color is now due to wet conditions).


Assessing Nitrogen Losses, John E. Sawyer Jun 2004

Assessing Nitrogen Losses, John E. Sawyer

Integrated Crop Management News

Several methods can help estimate nitrogen (N) loss and supplement N need. They should be used as guides and for information regarding N application. Late spring soil nitrate test. Details about this test can be found in the Iowa State University publication PM 1714, Nitrogen Fertilizer Recommendations for Corn in Iowa. Soil condition should allow the collection ofgood samples from the entire one-foot depth.


Wet Weather, Stressed Corn, And Herbicide Applications, Kristine J. P. Schaefer May 2004

Wet Weather, Stressed Corn, And Herbicide Applications, Kristine J. P. Schaefer

Integrated Crop Management News

Wet weather conditions across much of the state have slowed or halted fieldwork and contributed to crop stress in many areas. Once fieldwork can be resumed, many corn growers may be facing the scenario of whether to spray postemergence herbicides or wait until weather conditions and crop growth have improved.


Weed Control Options In Late Corn, Robert G. Hartzler May 2004

Weed Control Options In Late Corn, Robert G. Hartzler

Integrated Crop Management News

The prolonged period of rain and high winds has prevented timely application of postemergence herbicides in many fields. By the time conditions allow field work, corn may be beyond the optimum size for postemergence applications. There are several concerns with delayed applications, including: 1) label restrictions regarding crop or weed size, 2) increased sensitivity of large corn to herbicides, and 3) reduced efficacy due to large weed size and/or canopy interference with spray coverage.


Soybean Replant Decisions In 2004, Adriana Murillo-Williams, Palle Pedersen May 2004

Soybean Replant Decisions In 2004, Adriana Murillo-Williams, Palle Pedersen

Integrated Crop Management News

After talking to the 12 Iowa State University extension field crop specialists this morning (May 24), corn planting should now be close to done and 80-85 percent of the soybean should be planted. Based on the current weather conditions, it is our "gut feeling" that we can first get back into the fields for planting next weekend - at the earliest. Quite a few soybean fields may need to be replanted based on the flooded fields and hail injuries.


Hail Injury To Corn And Soybean, Jason De Bruin, Palle Pedersen May 2004

Hail Injury To Corn And Soybean, Jason De Bruin, Palle Pedersen

Integrated Crop Management News

Last weekend was certainly an eventful week in terms of weather across the state. Unfortunately, in several of those heavy rainfall areas hail also occurred, adding a whole new dimension to crop injuries. Along with the flooded fields that will reduce plant stands, the damage caused to the plant by hail will also have to be considered when making replant decisions. Corn and soybean differ in their ability to tolerate hail damage and to compensate for reduced stands. For both crops, however, it is essential to make good estimations of plant health and accurate stand counts in order to determine ...


Update To Delayed Herbicide Options For Emerged Corn, Kristine J. P. Schaefer May 2004

Update To Delayed Herbicide Options For Emerged Corn, Kristine J. P. Schaefer

Integrated Crop Management News

This is an update to the article Delayed herbicide options for emerged corn, published in the May 17, 2004 ICM Newsletter. Define herbicide recently received EPA registration for use postemergence in corn. Define can be used through the 5th leaf collar stage of corn. Define does not control emerged weeds; so, it should be applied either prior to weed emergence or tank mixed with approved postemergence herbicide products.


Crop-Specific Cultivating Tillage, Mahdi Al-Kaisi, H. Mark Hanna, Michael Tidman May 2004

Crop-Specific Cultivating Tillage, Mahdi Al-Kaisi, H. Mark Hanna, Michael Tidman

Integrated Crop Management News

Now that the seed is in the ground for many producers, it's time to turn to the issues of row-crop cultivation and rotary hoeing, and the impact that both can have on soil erosion, productivity, and profitability.


Delayed Herbicide Options For Emerged Corn, Kristine J. P. Schaefer May 2004

Delayed Herbicide Options For Emerged Corn, Kristine J. P. Schaefer

Integrated Crop Management News

NOTE: see also the update to this article.

Whether due to unfavorable weather conditions or inevitable spring constraints, there are some fields where corn has emerged before the planned preemergence herbicides could be applied. Many preemergence corn herbicides can also be applied early postemergence in corn. Axiom, Balance, Define and Epic herbicides are exceptions and can only be applied prior to corn emergence. The table below lists some of the preemergence corn herbicide products that can also be applied postemergence, as well as the recommended maximum plant heights or growth stages at application. Products listed include only those that do ...


Frost Injury To Alfalfa, Stephen K. Barnhart May 2004

Frost Injury To Alfalfa, Stephen K. Barnhart

Integrated Crop Management News

The questions of frost injury on alfalfa (and other forage species) normally come in the fall, with the first or second frost of the fall/winter. What about the impacts of a late spring frost? Low temperatures, whether visible frost is present or not, will influence the growth of established forage plants as well as newly emerged seedlings.