The regional Corn Nitrogen Rate Calculator (CNRC) website was recently updated with a fresh look and a revised N response trial database. The concept and calculation process remains the same. The CNRC website url has changed to (http://cnrc.agron.iastate.edu/). The site is now more user friendly on smartphones. Read more about Corn Nitrogen Rate Calculator Website Update
Integrated Crop Management News
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Seedling diseases could be an obstacle for farmers this year with the early planting of corn and soybean. While we all hope that seedling diseases will be a small consideration, it is important to be ready for them. It is also important to know how to sample for them. Read more about Spring Seedling Sampling
The black cutworm (BCW) is a migratory pest that cuts and feeds on early vegetative-stage corn. Black cutworm moths arrive in Iowa with spring storms each year. These moths lay eggs in and around fields and the emerging BCW larvae cut seedling corn. The sporadic nature of this pest makes scouting essential to determine if management is needed. Scouting for BCW larvae helps to determine if an insecticide application will be cost effective. Read more about Black Cutworm Scouting Advisory 2016
A simple but potentially valuable spring task to consider is sampling fields for the soybean cyst nematode. And since we are heading into the cropping season, it makes sense that attention be given to those fields in which soybeans will be grown in 2016. Read more about Don't Forget SCN Sampling on Your List of Spring Chores
Seedcorn maggot is a seed and seedling pest of corn and soybean. Plant injury is especially prevalent during cool and wet springs. The larvae, or maggots, feed on germinating corn and soybean seeds or seedlings (Photo 1). They can feed on the embryo, delay development or kill the plant. Infestations tend to be field-wide instead of grouped together like for many other pests. To confirm seedcorn maggot injury, check field areas with stand loss and look for maggots, pupae and damaged seeds (e.g., hollowed out seeds or poorly developing seedlings). Read more about Look for Seedcorn Maggot in Corn and Soybean
The benefits of healthy soil in sustaining crop production are most evident when growing conditions are less than ideal. Healthy soils increase the capacity of crops to withstand weather variability, including short term extreme precipitation events and intra-seasonal drought. The extreme drought in 2012 resulted in variable yield reduction to corn and soybean production in Iowa with the worst impact on fields with conventional tillage systems (i.e., chisel plow, deep ripping, etc.). Read more about Soil Health Benefits for Sustaining Crop Production
The weather forecast appears to be favorable for field activities so people will be anxious to get into the field. A concern for many will be the effect of the widespread freeze on the performance of burndown herbicides. Unfortunately, there is no simple blanket statement that can be made since the plant response will vary depending on weed species, weed size, and the herbicides used. Read more about Cold Temperatures and Burndown Herbicides
The percentage of soybean treated with a seed treatment has increased greatly in recent years. Over the past five growing season, the Robertson lab has evaluated the effect of commercial seed treatments on stand count, disease incidence and severity, and yield of soybean with funding provided by Iowa Soybean Association. Read more about 2015 Evaluation of Commercial Seed Treatments on Soybean at Three Locations in Iowa
It’s time to plant small grains. When planting oats, spring wheat, and barley, farmers typically plant two to three bushels of small grains per acre, but there is a better way to optimize plant populations and grain yields. Farmers calculate corn and soybean rates by seed count and should do the same for small grains. Several factors affect final plant stands at oat harvest, including: desired final plant stand, number of oat seeds per pound, germination rate in the seed lot, and expected stand loss from irregular seeding depth or early plant death. Read more about Fine-Tune Oat Seeding Rate This Spring
Take time now to get a plan in place for terminating a cover crop. Whether termination will be done with a herbicide, rolling/crimping, or tillage, it is important to know not just the advantages, but also the limitations with a termination method. Regardless of termination choice, it is important to have a plan in place to minimize problems this spring. Read more about Terminating Cover Crops - What's Your Plan?