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Tissue testing in conjunction with in-season soil testing, comparing field areas with apparent deficiency symptoms or poor growth with nearby seemingly unaffected areas, is a practical and useful way of using tissue testing.
Early season similarities between the two years raise the question, could 2010 turn out like 1983?
Questions often arise in June about 'emergency or catch-up' fertilization for soybean. Producers wonder if fertilizer rates were inadequate or if late planting dates, replanting and cold or excessively wet conditions have altered the crop nutrient uptake and fertilization need.
Stephen K. Barnhart, Department of Agronomy
Extended periods of rainfall, flooding, hail, or all of the above have producers scrambling for replant or prevented planting options. Each choice has practical and economic implications, so should be approached with some thought.
One consideration is the implication for crop insurance. Before changing crops or planting an 'emergency' forage crop, check with your crop insurance representative.
Pioneer is the first company to offer 'in the bag' refuge for Bt corn. While a potentially convenient benefit, some growers may find that this complicates refuge planting. NOTE: correction was made to ECB refuge distance for OAM1 after this article was published on 06/23.
The fundamentals of crop plant diagnostics is the focus of the 2010 Field Diagnostic Clinic July 12-13 at the Field Extension Education Laboratory.
The Crop Management Clinic, an intensive two-day training program that focuses on the latest developments in crop production and protection, will be held July 14-15.
By XB Yang, Linus Li, and SS. Navi, Department of Plant Pathology
Recent growing seasons have not been typical ones, and this season seems to follow this pattern. Each unusual season has unique disease problems. This year, early planted soybeans are in flowering stage and we are starting to see a different set of issues. There are three things to look for when scouting these fields.
A web-based model helps estimate potential soybean yield loss due to weed competition. All that is required is crop stage, estimated weed-free yield potential, weed density and weed size.
The widespread rain that has occurred across Iowa has been favorable for the development of early season disease in both corn and soybean. But from a management perspective, all of these diseases cause little if any yield loss.
