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By Stephen Barnhart, Department of Agronomy
There have been reports of localized areas of winterkill and winter injury to forage and winter cereal grain crops this past winter in Iowa.
The reports indicate damage on sites across the state, but the most extensive areas are in northeast Iowa. There are reports of damage to alfalfa, orchardgrass, perennial ryegrass, winter wheat and winter triticale.
By Palle Pedersen, Department of Agronomy
A few people have called me this week regarding planting soybean after soybean. All cases were from southeast Iowa where many river bottoms were flooded for an extended period of time last year and growers were forced to plant soybean even though their plan was to plant corn. To get back into their field rotations this year soybean would need to be planted after soybean. Is that a problem?
By Doug Cooper, Extension Communications and External Relations
On April 27, Doug Cooper, Extension communications specialist, interviewed Iowa State University Extension climatologist Elwynn Taylor, integrated pest management specialist Rich Pope and corn agronomist Roger Elmore for the weekly crops and weather update.
By Jon Tollefson, Department of Entomology
As technology traits in corn seed increase seed prices and the price received per bushel increases, it is wise to consider black cutworm management in corn. Many areas of Iowa were cool and wet last spring, 2008. That weather often delayed planting and created flooded areas that had to be replanted. These conditions may have caused black cutworms to be more common than usual.
by Palle Pedersen, Department of Agronomy
Soybean is a legume with a seed content of approximately 38 percent protein. Because of its seed protein concentration, soybean has a large nitrogen demand and continues to increase as yield increases. Total nitrogen accumulation for soybean is supplied by two sources: the nitrogen fixation and from the residual soil nitrogen pool.
By Palle Pedersen, Department of Agronomy
Interest in corn nematodes is increasing with recent changes in corn production. Greg Tylka, extension plant pathologist, shares a few facts about the plant-parasitic nematodes.
By Roger Elmore and Lori Abendroth, Department of Agronomy
Plant populations continue to increase and, unfortunately, so do seed costs. Certainly hybrids today withstand the stress of higher seeding rates better than ever before. In fact, higher seeding rates are one component that drove annual yield increases the last several decades.
Hartzler outlines the restrictions associated applying 2,4=D to crop land.
Several recommendations can help management of poison hemlock.
