Nitrogen fertilizer is one the most costly crop inputs following seed, and is also quite important for insuring top corn yields. In addition, nitrogen that doesn’t get taken up by a growing corn crop can cause environmental concerns. For these reasons, growers should be concerned with managing this valuable resource carefully. In this educational video Liqui-Grow’s agronomy research lead will discuss evidence based research comparing fall vs spring nitrogen sources effects on corn yields and farmer profitability.
- Following the 4R’s of nutrient stewardship (the right placement, timing, source and rate) will often lead farmers toward greater crop yields and higher nutrient use efficiency.
- Applying nitrogen fertilizer for corn production in the spring vs the fall is a great example of the “right” time.
- Science based studies conducted by the University of Illinois, Minnesota State University and by Iowa State University shows on average a 7.9% yield increase for spring vs fall nitrogen applications
- Economically these studies clearly show that spring applied nitrogen is the most economical decision for Midwestern corn farmers. In some cases, growers might be able to increase their per acre profit by $43/ac by switching from fall to spring nitrogen sources.
Download the Excel file and use as a tool to plug in your own numbers: Fall vs Spring Nitrogen Economics