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Showing posts from May, 2016

Potential impact of cold temperatures on herbicide-induced crop injury and effective weed control

Jeff Gunsolus, Extension Agronomist - Weed science Last week’s cold and wet conditions followed by the weekend’s frost creates the potential for herbicide-induced crop injury from soil- and post- applied herbicides as well as reduced postemergence weed control. Postemergence applications The warmer and dryer conditions projected for this week are encouraging for crop recovery. Therefore it is wise to allow for a few days of warm weather for the crops and weeds to recover before heading out to the field to apply any postemergence herbicide. Your crops need time to recover so they can adequately metabolize the herbicide, thus preventing herbicide-induced crop injury and the weeds will need time to recover before they can take up the herbicide and move the herbicide to active growing sites.

The Three Biggies: Urea, Anhydrous Ammonia, and UAN

Fabián G. Fernández Nitrogen (N) fertilizer is extremely important for crop production. There are many sources available in the marketplace, but the three most important in order of tonnage sales for Minnesota are urea, anhydrous ammonia, and urea ammonium nitrate (UAN). Since many are very busy applying N and doing other field operations at this time, my purpose is not to go into a lengthy discussion on N sources but I thought it would be good to review a few important points.