Anhydrous Ammonia Application and Dry Soils
It is almost time that anhydrous ammonia (NH3) applications could begin, however, many soils in Iowa are quite dry this fall. So, can anhydrous ammonia be applied to dry soil? Will it be held in dry soil?
Integrated Crop Management News
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Integrated Crop Management Conference Nov. 30-Dec. 1
The Iowa State University Integrated Crop Management Conference will be held Nov. 30-Dec. 1 on the Iowa State campus.
Know Your Choices: Hundreds of SCN-resistant Soybean Varieties For Iowa
Soybean cyst nematode (SCN) is effectively managed with resistant soybean varieties grown in rotation with corn, and Iowa growers have hundreds of SCN-resistant soybean varieties from which to pick. ISU Extension recently updated the list of SCN-resistant soybean varieties in late maturity group 0 and maturity groups 1, 2, and 3.
Frogeye Leaf Spot Resistance NOT Found in Iowa
Daren Mueller, Department of Plant Pathology and Microbiology
During the 2011 season several foliar diseases were present in Iowa, including brown spot, Cercospora leaf blight and frogeye leaf spot. The disease that was noticeably higher in 2011 compared to previous years was frogeye leaf spot, at least in susceptible varieties. The pathogen that causes frogeye leaf spot, Cercospora sojina, has been in the news several times the past couple of years because of reports of resistance to strobilurin fungicides.
Frogeye Leaf Spot Resistance NOT Found in Iowa
The possible development of resistant strains of the frogeye leaf spot pathogen to strobilurin fungicides should be a consideration as growers are deciding about foliar fungicides for 2012.
Be Cautious When Interpreting Early Fall Soil-Test Results
Sampling under very dry conditions may increase soil sampling error because it is more difficult to control sampling depth and proper soil core collection.
New Publication Makes Interpreting Manure Nutrient Analyses Easier
Iowa State University Extension and Outreach has recently released a publication that complements existing extension manure management resources. How to Interpret Your Manure Analysis, PM 3014, explains the value of manure sample analyses that indicate nutrient concentrations.