Small Grains WSU Extension
Spring Canola Nitrogen Rate Calculator
* denotes required input fields
| Estimated Yield Potential (lbs/A) | * |
| Previous Crop N-debit Credit | * |
| Soil N Supply Estimation: | |
| % SOM | % * |
| Ammonium-N (lbs/A) | * |
| Nitrate-N (lbs/A) | * |
| Soil Sampling Depth | * |
| Tillage Method | * |
| Output Fields: | |
| Mineralization Calculation (lbs/A) | |
| Total Mineral N (lbs/A) | |
| Estimated Total N Supply | |
| UNR** (lbs N/100 lbs seed) | |
| Soil N Needed to Meet Yield Goal | |
| Total N Required (lbs/A) | |
| N Fertilizer Requirements (lbs/A) | |
Contact Isaac Madsen (isaac_madsen@wsu.edu) 360-448-9081 with questions About the calculator:
The Spring Nitrogen Rate Calculator is designed to estimate the amount of N required to grow a desired yield goal. It is important to realize that N is only one of many factors which can affect canola yield. The equations used to create this calculator were derived from experiments conducted in Washington State and published in the Pacific Northwest (Pan et al. 2016).
Improving the calculator:
The data collected to develop this calculator was conducted on small plot research experiments conducted near Davenport and Pullman, WA. Small, replicated plots are essential for determining the correct N rate. However, small plot trials at limited locations cannot include all regional variation. In addition to the calculator there is a form which can be found at https://forms.gle/ScEKkvrn9mAFh2YHA. The form is designed to collect actual yield and fertilizer data from canola production in Washington, Oregon, and Idaho. Pan, W. L., McClellan Maaz, T., Hammac, W. A., McCracken, V. A., & Koenig, R. T. (2016). Mitscherlich-Modeled, Semi-Arid Canola Nitrogen Requirements Influenced by Soil Nitrogen and Water. Agronomy Journal, 108(2), 884–894. https://doi.org/10.2134/agronj2015.0378