Managing 2,4-D for No-Till Burndown Treatments
By Bob Hartzler, Department of Agronomy
2,4-D is commonly added to glyphosate for burndown of existing vegetation in no-till fields. The advantages of including 2,4-D include:
Integrated Crop Management News
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Improved Disease Resistance on the Way – One Key to Soybean Improvement
By John H. Hill and Alan L. Eggenberger, Department of Plant Pathology
Inoculating CRP Ground
By Palle Pedersen, Department of Agronomy
Surface Waters: Ammonium is Not Ammonia – Part 1
By John Sawyer, Department of Agronomy
A recent article in The Des Moines Register newspaper has caused considerable controversy regarding nitrogen in Iowa streams and rivers. The article (High ammonia levels threaten D.M.’s water, April 6, 2008) featured information about “ammonia” levels in certain Iowa surface water systems during the recent winter time period.
Calculating Degree Days
By Rich Pope, Department of Entomology
Warm-blooded animals including humans generate their own internal heat and have regulatory systems to hold maintain body temperature in an operational range. These systems provide insulation from fluctuations of temperature in the environment and allow growth and development based on the passage of time in minutes, hours, weeks, months and years.
You Couldn’t Apply Phosphorus and Potassium Last Fall and Now It’s Too Wet
By Antonio Mallarino, Department of Agronomy
Managing Residue for a Good Stand
By Mahdi Al-Kaisi, Department of Agronomy and Mark Hanna, Department of Agricultural and Biosystems Engineering
Spring Sampling OK for Two Corn Nematode Species
By Greg Tylka, Department of Plant Pathology
Winter Annual Weeds and SCN – Is There Cause for Concern?
By Greg Tylka, Department of Plant Pathology
The frequency of occurrence of winter annual weeds in Iowa fields has increased as more fields are managed with no-till production practices. And in recent years, scientists have discovered that the winter annual weeds purple deadnettle, henbit and field pennycress are moderate to good hosts for the soybean cyst nematode (SCN).
Be Careful with Susceptible Soybean Variety in Rotation to Manage SCN
By Greg Tylka, Department of Plant Pathology
The soybean cyst nematode (SCN) can be managed effectively by growing SCN-resistant soybean varieties. There currently are more that 700 SCN-resistant soybean varieties available in maturity groups 1, 2 and 3 for Iowa growers. Information on the varieties is available in ISU Extension publication Soybean Cyst Nematode-Resistant Soybean Varieties for Iowa (PM 1649, pdf).