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Dec
13
Posted by:
WCM Staff
12/13/2007 1:25 PM
In fall 2005 UWEX began using the Maximum Return to N (MRTN) approach to make N rate suggestions for corn. Since that time, both corn and N prices have fluctuated. Currently N prices are high and may continue to move upward as we approach spring. Several of our clientele have asked for an expanded N:corn price ratio chart to reflect current and potential prices. Well, we listened and here it is.
Supplemental Nitrogen to Corn Price Ratio Table
Carrie Laboski, Extension Soil Scientist
Bill Halfman, UWEX Agriculture Agent
In fall 2005 UWEX began using the Maximum Return to N (MRTN) approach to make N rate suggestions for corn. Since that time, both corn and N prices have fluctuated. Currently N prices are high and may continue to move upward as we approach spring. Several of our clientele have asked for an expanded N:corn price ratio chart to reflect current and potential prices. Well, we listened and here it is; see Table 1.
In order to determine the most economical N application rate for corn, first use Table 1 to find the ratio that represents your nitrogen price to corn price ratio. Next find the economical N rate and range of profitable N rates by consulting the MRTN table (Table 2). You will need to know your soil yield potential, previous crop, and N:corn price ratio. Remember forage legume credits should still be taken. Below are some points to consider when deciding on which end of the MRTN range to use.
- If residue covers more than 50% of the soil at planting, use the upper end of the range.
- If 100% of the N will come from organic i.e. manure sources, use the top end of the range. In this situation, up to 20 lb N/a in starter fertilizer may also be applied.
- For medium- and fine-textured soils with more than 10% organic matter, use the low end of the range.
- For medium- and fine-textured soils with less than 2% organic matter, use the high end of the range.
- For coarse-textured soils with less than 2% organic matter, use the high end of the range.
- For coarse-textured soils with more than 2% organic matter, use the middle to low end of the range.
- For corn following small grains on medium and fine-textured soils, the middle to low end of the range is most appropriate.
- If there is a likelihood of residual N (carry-over N), use the low end of the range or use the high end of the range and subtract preplant nitrate test (PPNT) credits.
For additional information on selecting an economical N rate for corn, please read Chapter 6 Nitrogen in UWEX A2809 Nutrient application guidelines for field, vegetable, and fruit crops in Wisconsin. You can download a copy for free or purchase a hard copy at: http://learningstore.uwex.edu/Nutrient-Application-Guidelines-for-Field-Vegetable-and-Fruit-Crops-in-Wisconsin-P185C0.aspx
Supplemental N to corn price ratios Table 1.pdf
Supplemental N to Corn Price ratio Table 2.pdf
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