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| If you have normalized yield data the easy button is try and push yield in your good spots and try to reduce N to optimum yield in the bad spots. This works awesome but it’s the reverse of trying to even out yield with VR once you figure out here is spots you just can’t fix economically.
I’ve done one off of ec or cec alone on some grazing wheat where I have no yield data, but I have walked the field for 10 years and know the cec map is a direct reflection of yield potential. Top dressed 150 units N on good spots, 100 medium and 50 poor. Average of 100 units. Basically robbing the extra 50 units from the poorest 1/3 of the field to push on the best 1/3. Satisfy farmer budget and if there was a way to measure yield in grazing I’m confident we will make more pounds of forage using the same nutrients.
To use EC or cec you need to know a lot about the farm because we all know sometimes the higher is because of an issue not a good spot. | |
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Conversation on Variable Rate N - what metrics do you base your decisions on?