Soil Fertility

There are a lot of moving pieces when it comes to managing soil fertility including soil testing, interpreting soil test results to make fertilizer recommendations, understanding different crop nutrients needs, accounting for crop nutrient removal, knowing how to manage different fertilize sources, and being able to identify crop nutrient deficiencies. Find more information on soil fertility management for crop production in Iowa.
Timely Insights on Soil Fertility
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May 15, 2025Content Author
You won’t want to miss any of the upcoming field days hosted at the outlying Iowa State University Research Farms this summer. These field days will feature the latest information on crop production and management practices. Below is a list of the upcoming field days that will take place as well as what topics will be featured at each field day. All field days are of no cost to attendees and open to the public.
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April 21, 2025Content Author
The last week or two has been refreshing with warmer temperatures and pastures beginning to green up. As that green flush appears, it can be tempting to turn animals out too early. However, many pastures across the state have taken a hit in recent years due to drought and/or flooding. As of October 28, 2024, much of the state was still experiencing drought conditions, with soil moisture deficits extending from the surface down to 1.5 feet (Figure 1).
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March 30, 2025Content Author
Being properly prepared is the key to being sure you see your family at home at the end of the day.
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March 6, 2025Content Author
Optimum nitrogen fertilizer rates for corn can vary by more than 100% from field-to-field and year-to-year. This variability is a product of near limitless interactions among crop genetics, management, and environment factors (weather & soil type). Among them, the amount of soil inorganic nitrogen in the soil is one of the most important (Baum et al., 2024).
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October 30, 2024Content Author
The crops are coming out and it’s ALMOST time for farmers to start making fall nitrogen applications. Remember that soil temperatures should be below 50°F at a depth of 4 inches and continuing to drop before making fall nitrogen applications —ideally, the cooler, the better. It's important for farmers to check the soil temperatures in their specific fields, as many factors can influence them.