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Aberdeen MS | The best bang for your buck at this time without knowing what your micro availability and taking the "safest route" would be 5 gal of the 3-18-18 maximum.
That will be the "softest" approach in regards to minimizing the possible adverse microbial activity in the seed zone. Generally speaking (all a person can do in a forum as this without specific data), soil test reports in the "low" range (that is reporting of what is available, not what is in the soil profile) will have about a 95% probability of having positive results from starter placed nutrients.
Just make sure you aren't relying on the 5 gallons to be a "complete" program for the year. It may take your crop through to harvest with excellent results, but it also may not.
Keep in mind that P and K are basically immobile in soil profile. Surface dribbling will eventually get the nutrient into the seed zone, a few years down the road, not much so in the application year.
You are looking at short term economic "bang for the buck", not long term feasibility. A good quality 3-18-18 will be fine either "splashing" or placed under the seed at the 5 gallon rate with heavy clays.
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Pop-Fertilizer Placement
