It is that time of year and with the weather conditions we’ve had the last 30 day we should expect to see purple corn, yellow corn, and maybe even some tattered leaves. Mostly the mosaic of corn color is a product of the weather; cooler and wetter. Over the last 30 days, rainfall has been 150 to 200% above normal and temperatures have be a couple degrees cooler than normal across Iowa.
There are several possible reasons for corn plants showing various shades of yellowing and interveinal leaf stripping.
By John Sawyer, Department of Agronomy
Last summer I provided observations in three ICM News articles (June 19, June 26, and July 8, 2008) on corn growth and response to nitrogen (N) applied in an anhydrous ammonia study conducted at the Iowa State University research farm between Ames and Boone. This series of articles was written in response to the record wet conditions encountered in 2008. Following is a summary of the grain yield response to N timing and rate.
by John Sawyer, Department of Agronomy
Earlier I provided observations in two articles (June 19 and June 26, 2008) on corn growth and response to nitrogen (N) applied in an anhydrous ammonia study being conducted at the ISU research farm between Ames and Boone. Following are some final observations (July 7, 2008).
