The first line of defense against herbicide resistance is using herbicide programs that include multiple herbicide groups effective against target weeds. When using premix products, this involves comparing the application rates of active ingredients in the premix versus rates applied with the stand-alone products. This step is needed to insure that the premix is providing an effective dose of the active ingredient. Read more about Breaking Down Resicore - Does It Pass the Test?
Integrated Crop Management News
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A new study from a multidisciplinary team led by Iowa State University agronomists shows that significant portions of Iowa farmland consistently lose money and could influence many farmers to change how they use some of the acres they devote to corn and soybeans. Read more about New ISU Research May Help Farmers Make More Informed Decisions About Land Use
Resistant soybeans are vital for managing the soybean cyst nematode (SCN). But SCN-resistant soybean varieties can vary greatly in their agronomic performance and in the SCN control that they provide. ISU evaluates more than 150 SCN-resistant soybean varieties each year in experiments conducted throughout Iowa. The results of the 2015 experiments have been recently compiled and made available in print and electronically. Results show continued benefits of SCN-resistant soybean varieties in producing higher yields and allowing less SCN reproduction than susceptible varieties. Read more about SCN Resistance Continues to Pay Twice in 2015
Really, it just had to rain large amounts in December. Seems we can’t get any relief from worrying about excess rain and impacts on nitrogen (N). The questions have already begun – what about fall 2015 fertilizer and manure N applications?
A few things to consider.
It is quite hard to make an estimate of losses for such an extreme event and time of the year. Following are factors to consider that will affect loss potential, including if N was applied and if so what fertilizer product or manure source. Read more about Nitrogen Loss?
As the saying goes, hindsight is 20/20; perfect vision. We often say “if we knew the weather, then we can provide the best recommendations.” Usually, we do not know the weather or we do not have the appropriate tools in place, so the questions remain unanswered. Now that we know the weather, the next important question is to determine what could have been done differently in 2015. This is an important part of understanding and evaluating production and environmental performance of our crop management decisions. Read more about Hindsight is 20/20: What Can Be Learned from 2015
To evaluate how good corn and soybean yields were in 2015, farmers and agronomists compare their yields to those obtained in previous years. To answer why yields were higher or lower than past years, they develop hypotheses to explain factors that limited yields based on their own experiences, anecdotal evidence from neighbors, knowledge of crop growth and development, and weather patterns. Read more about Yield Gap Analysis: What Limited Iowa Corn and Soybean Yields in 2015
During the 2015 growing season, a group of scientists from the Department of Agronomy ran a pilot project with the objective of forecasting end-of-season yields and in-season water and nitrogen dynamics (crop demand and soil supply). Read more about Wrap up and Validation of the Yield Forecast Project for 2015
This fall, field observations with significant amounts of intensive tillage and residue removal provide an opportunity to rethink such practices by considering research proven practices such as no-tillage (NT) and strip-tillage (ST), which have demonstrated their effectiveness in many parts of the state and across the Midwest. Read more about Protect Your Investment by Eliminating Tillage and Keeping Residue
The spread of herbicide-resistant weeds is a growing problem in many parts of the United States, and the number of weed species with resistance to glyphosate and other herbicides has risen dramatically; contributing to lower yields and profits for farmers. Read more about Research Team Uses Survey to Gain Better Understanding of Herbicide-Resistant Weeds
Iowa State University Extension and Outreach has released a new version of the Weed Identification Field Guide, first published in 2010, to assist producers and agronomists with accurately identifying weeds in Iowa corn and soybean fields. The Weed Identification Field Guide, 2nd Edition, includes additional weed species and updated information on herbicide resistance management. The guide is now available for purchase online from the Iowa State University Extension Store. Read more about New Weed Identification Field Guide Provides Updated Weed and Herbicide Resistance Information