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See above | 1 & 2 would be pretty good hand in hand. Core and send in your own samples, create fertilizer management zones based on the results.
VRS - it is harder to know ROI, but possible if you're either analyzing the data yourself or working with someone else.
4. Another good step.
5. How big is your operation? (personal question I know!). But if you feel you have some money to experiment, you could look at remotely sensed images of your crops to check NDVI, stress, etc. Not always something you can do about it, but it adds an extra layer of information. | |
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