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Iowa State University

Plant Sciences

Proceedings of the Integrated Crop Management Conference

2014

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Nutrient Reduction Strategy Update And Opportunities For Agribusinesses, Jamie Benning Dec 2014

Nutrient Reduction Strategy Update And Opportunities For Agribusinesses, Jamie Benning

Proceedings of the Integrated Crop Management Conference

The Iowa Nutrient Reduction Strategy is a science-based framework that identifies in-field, edge of field, and land use practices that minimize loss of nitrogen and phosphorus to surface water. In addition to reductions in agricultural non-point sources of nutrients, the strategy also identifies reductions for non-agricultural point sources such as municipal wastewater treatment plants. The Hypoxia Task Force identified a goal of reducing the total nitrogen and total phosphorus load by 45%. The Iowa Nutrient Reduction Strategy outlines the effectiveness of the identified agricultural practices to assist farmers in selecting practices individually or in combination to meet their nutrient reduction ...


Strip-Tillage Successes, Watch-Outs Based On Soil Type, Soil Drainage, And Climate, Mahdi Al-Kaisi Dec 2014

Strip-Tillage Successes, Watch-Outs Based On Soil Type, Soil Drainage, And Climate, Mahdi Al-Kaisi

Proceedings of the Integrated Crop Management Conference

The perceived effect of no-tillage on soil temperature, soil moisture conditions, soil compaction, soil productivity, and nitrogen movement and availability has become a major concern among producers considering adopting this tillage system. No-tillage presents a unique challenge in poorly drained soils, in which certain surface soil properties are affected due to the absence of tillage as a corrective measure. Effective tillage systems create an ideal seedbed condition (i.e., soil moisture, temperature, and penetration resistance) for plant emergence, plant development, and unimpeded root growth.


Incorporating Risk Into 4r Nutrient Management Decisions, Peter Kyveryga, Pat Reeg, Tristan Mueller, Chris Anderson Dec 2014

Incorporating Risk Into 4r Nutrient Management Decisions, Peter Kyveryga, Pat Reeg, Tristan Mueller, Chris Anderson

Proceedings of the Integrated Crop Management Conference

A substantial amount of the uncertainty and unpredictability related to corn nitrogen (N) management across the Midwest can be attributed primarily to several common risk factors: (1) environmental losses of N to water or air, (2) economic penalties from over or under applications of N, and (3) difficulties of quantifying the supply of nitrogen available from the soil, and therefore, making adjustments for in-season weather. Rainfall plays a crucial role in controlling all of these risk factors, but its effects on N management are difficult to quantify when making management decisions for unobserved or future situations.


Fertilizer Situation And Outlook, David Asbridge Dec 2014

Fertilizer Situation And Outlook, David Asbridge

Proceedings of the Integrated Crop Management Conference

No abstract provided.


Nutrient Management Plus With Perennial Grass Strips, Matt Liebman, Tim Youngquist, Ken Moore, Jill Euken Dec 2014

Nutrient Management Plus With Perennial Grass Strips, Matt Liebman, Tim Youngquist, Ken Moore, Jill Euken

Proceedings of the Integrated Crop Management Conference

This session will share learnings from two applied research projects conducted in Iowa that are designed to 1) decrease soil erosion; 2) improve water quality; 3) provide feedstocks for bioprocessors; and, 4) improve farm profitability.


Fungicide Resistance In Field Crops, Daren Mueller Dec 2014

Fungicide Resistance In Field Crops, Daren Mueller

Proceedings of the Integrated Crop Management Conference

Herbicide resistant weeds have been in the news quite frequently lately, and rightfully so. Their existence is changing how farmers currently manage weeds in corn and soybean fields. But resistance to pesticides is not limited to weeds. Fungi that cause crop disease can also develop resistance to fungicides. This presentation will cover the basics of fungicide resistance and outline ways to avoid or delay fungicide resistance from occurring. Some of this research is funded through the soybean check off from Iowa Soybean Association and the United Soybean Board. We thank our sponsors for this support.


Crop Weather Outlook 2015, Elwynn Taylor Dec 2014

Crop Weather Outlook 2015, Elwynn Taylor

Proceedings of the Integrated Crop Management Conference

The Midwest suffered the first drought since 1988 during 2012. Chances are that event opened a period of crop weather that will have greater variability (a mixture of very good and of very bad crop years) than we have seen since before 1996.


Corn And Soybean Yield Responses To Micronutrients Fertilization, Antonio P. Mallarino, Joshua T. Enderson, Mazhar U. Haq Dec 2014

Corn And Soybean Yield Responses To Micronutrients Fertilization, Antonio P. Mallarino, Joshua T. Enderson, Mazhar U. Haq

Proceedings of the Integrated Crop Management Conference

Micronutrients such as boron (B), chloride (Cl), copper (Cu), iron (Fe), manganese (Mn), and zinc (Zn) are essential plant nutrients taken up by crops in very small amounts, but a deficiency can have profound effects on yield because they perform important physiological functions. Deficiencies seldom are observed or are widespread in Iowa and neighboring states. Farmers and crop consultants have been asking questions, however, concerning possible yield loss due to deficiency of micronutrients in corn and soybean.


Using Precision Agriculture Technologies For Phosphorus, Potassium, And Lime Management With Lower Grain Prices And To Improve Water Quality, Antonio P. Mallarino Dec 2014

Using Precision Agriculture Technologies For Phosphorus, Potassium, And Lime Management With Lower Grain Prices And To Improve Water Quality, Antonio P. Mallarino

Proceedings of the Integrated Crop Management Conference

Crop prices are decreasing after several years of good prices and public concerns about nutrient application impacts on water quality are increasing. The profitability of nutrient management can be increased and impacts on water quality can be decreased by using a variety of precision agriculture technologies.


Using Pesticide Stewardship To Minimize Off-Target Exposures, Gretchen Paluch Dec 2014

Using Pesticide Stewardship To Minimize Off-Target Exposures, Gretchen Paluch

Proceedings of the Integrated Crop Management Conference

Fundamental concepts of pesticide stewardship are of increasing importance to support the future of Iowa agriculture. Pesticide applicators are depended upon to integrate these concepts into current crop production practices that face numerous challenges including resistance in pest populations, changes in technology, shifting land use management practices, and the rising costs of production. The complexity of agricultural production and instant access to information empowered by modern technologies are placing increasing importance on efficiency of decision-making practices and communication of on-site assessment.


Corn Nitrogen Rate Management: Facts, Concepts, And Mother Nature, John E. Sawyer Dec 2014

Corn Nitrogen Rate Management: Facts, Concepts, And Mother Nature, John E. Sawyer

Proceedings of the Integrated Crop Management Conference

Yearly nitrogen (N) input is typically required for optimal corn yields in the majority of Iowa crop rotations. The exception would be first-year corn following established alfalfa where none to only a small N input is typically needed. If not fertilized with N over time, corn yield will be very limited as the soils ability to supply plantavailable N becomes depleted.


Increasing Profitability In Soybean Production By Optimizing Planting Rates, Tristan Mueller, Patrick Reeg, Peter Kyveryga Dec 2014

Increasing Profitability In Soybean Production By Optimizing Planting Rates, Tristan Mueller, Patrick Reeg, Peter Kyveryga

Proceedings of the Integrated Crop Management Conference

Farmers are interested in better management of seeding rates within soybean fields to increase productivity andeconomic returns. With seed prices trending higher and soybean commodity prices trending lower during the lasttwo years, there are many questions about optimal seeding rates and factors that influence these rates under specificfield conditions.


Sudden Death Syndrome Management Update, Daren Mueller, Yuba Kandel, Leonor Leandro Dec 2014

Sudden Death Syndrome Management Update, Daren Mueller, Yuba Kandel, Leonor Leandro

Proceedings of the Integrated Crop Management Conference

Sudden death syndrome (SDS) was severe in many fields across Iowa in 2014, resulting in yield loss and frustration for farmers. There are a few positive things that we can learn in a year like this, though. For one, many soybean varieties were pushed to their limits, allowing farmers to get a really good evaluation of the genetic resistance for SDS in a variety. Additionally, other beneficial management strategies can be identified that complement variety resistance.


Cover Crops, Weeds And Herbicides, Bob Hartzler, Meaghan Anderson Dec 2014

Cover Crops, Weeds And Herbicides, Bob Hartzler, Meaghan Anderson

Proceedings of the Integrated Crop Management Conference

The Iowa Nutrient Reduction Strategy and other factors have increased interest in fitting cover crops into Iowa’s cropping systems. The benefits of cover crops are well documented, and include reducing erosion, nutrient losses, and soil compaction. Legume cover crops such as hairy vetch may contribute nitrogen via biological fixation. The extended period of plant growth during times when soil is often left bare also is beneficial for overall soil health. Finally, cover crops can complement weed management programs by suppressing the establishment of weeds. This paper will focus on the interactions between cover crops, weeds and current weed management ...


Corn Diseases Of 2014: Northern Corn Leaf Blight, Physoderma Brown Spot, Ear And Stalk Rots, Alison Robertson Dec 2014

Corn Diseases Of 2014: Northern Corn Leaf Blight, Physoderma Brown Spot, Ear And Stalk Rots, Alison Robertson

Proceedings of the Integrated Crop Management Conference

The 2014 growing season started with good conditions at planting. Above normal precipitation in June however was prevalent across most of the state and likely played a role in infection and development of Northern corn leaf blight (NCLB), Physoderma brown spot and stalk rot, and stalk rot. A dry July brought NCLB to a stand still but frequent precipitation events in August and September enabled further development of the disease. Goss’s wilt was also prevalent on hybrids rated susceptible to moderately susceptible to this disease. Although southern rust was reported, the cooler than normal temperatures in August and September ...


Research Insights In Goss’S Wilt And Leaf Blight, Alison Robertson, Charlie Block, Sharon Eggenberger, Andy Gogherty, Harry Horner, Sally Mallowa, Forrest Nutter, Jeff Sernett, Lisa Shepherd Dec 2014

Research Insights In Goss’S Wilt And Leaf Blight, Alison Robertson, Charlie Block, Sharon Eggenberger, Andy Gogherty, Harry Horner, Sally Mallowa, Forrest Nutter, Jeff Sernett, Lisa Shepherd

Proceedings of the Integrated Crop Management Conference

Goss’s wilt and leaf blight is caused by the bacterium Clavibacter michiganensis subsp. nebraskensis (Cmn). The disease was first reported in Nebraska in 1969 and soon after in the surrounding states including Iowa. Corn breeders identified resistance to the bacterium and by the 1980s the disease was no longer a threat to corn production except in eastern Nebraska. In 2008, Goss’s leaf blight was reported in eight counties in Iowa. In 2011, the disease was widespread throughout the state and up to 50 percent yield losses occurred in some fields.


Insights Into The Diaporthe/Phomopsis Complex Infecting Soybeans In The United States, Febina M. Mathew, Samuel G. Markell Dec 2014

Insights Into The Diaporthe/Phomopsis Complex Infecting Soybeans In The United States, Febina M. Mathew, Samuel G. Markell

Proceedings of the Integrated Crop Management Conference

Diaporthe/Phomopsis species are pathogens on a wide range of hosts including soybeans (Glycine max L.), and responsible for several diseases, some of which are of economic importance. Under favorable environmental conditions, these diseases can result in in significant yield losses (Backman et al. 1985). For example, yield losses from Stem canker in the Midwest have ranged from minor to in excess of 50% (Hartman et al. 1999). Four Diaporthe species have been reported pathogenic on soybean – Diaporthe sojae, the causal agent of pod and stem blight; Diaporthe caulivora and Diaporthe aspalathi, causal agents of Northern and Southern stem cankers ...


Weed Management Update For 2015, Micheal D. K. Owen, Robert G. Hartzler Dec 2014

Weed Management Update For 2015, Micheal D. K. Owen, Robert G. Hartzler

Proceedings of the Integrated Crop Management Conference

Given the environmental conditions in 2013 resulting in delayed herbicide applications and drought later in the summer, the increasing use of “alternative” herbicides and the cool wet conditions in 2014, conditions were excellent for many interesting occurrences. Herbicide carryover was a factor for several products, several products provided evidence why farmers preferred using glyphosate alone, and herbicide-resistant weed populations continue to evolve. It appears that the message of diversity in order to manage herbicide resistance is gaining traction but to the extent that the focus is primarily on herbicides which was the reason that herbicide resistance became such a big ...


The Benefit Of Understanding Biotechnology, Don Lee Dec 2014

The Benefit Of Understanding Biotechnology, Don Lee

Proceedings of the Integrated Crop Management Conference

If you would answer yes to the questions below, then you would benefit from understanding biotechnology: 1. Do farmers ask me to predict the work-load consequences of making different seed product choices? 2. Would the farmers I serve be happy if I can help them slow the evolution of their pest populations? 3. Can I describe how biotechnology will develop to bring new approaches to addressing crop management problems in the future? and 4. Am I considered an expert in my community on the science behind our food production system? This session will provide a chance to explore several on-line ...


Continuous Improvement In The Areas Of Crop, Nutrient, Pest And Soil And Water Management, Patrick Reeg, Peter Kyveryga, Tristan Mueller Dec 2014

Continuous Improvement In The Areas Of Crop, Nutrient, Pest And Soil And Water Management, Patrick Reeg, Peter Kyveryga, Tristan Mueller

Proceedings of the Integrated Crop Management Conference

During the last 15 years, the Iowa Soybean Association On-Farm Network® has developed and adopted a variety of tools to conduct on-farm studies to improve efficiency and profitability in crop production by engaging farmers in participatory learning. The information collected enables farmers to make informed decisions by examining results of on-farm studies evaluating different products and management practices.