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Martinsville, Ohio | 4 row, Jeff the foliar dud(e) has the fancy explanation why you may not have enogh P. This is where the tissue test comes in, you should have found P Low to Deficient with a tissue test in that corn at tassle and I think you would have.
I didn't see see that you put the lime on and that would help over time. If it is rental ground, 200 lbs of pellet lime in your dry mix has helped me avoid P and other deficiencies that crop year and I have picked up as many as 20 bushels doing it.
When it calls for 74 units, I about have to double that to come close, that would be over 200 lbs of MAP or DAP and still the conversion is lower because it needs 1500 lbs of lime.
Theoretically you could convince yourself that 10 gallons of 10-34-0 would be enough to feed the P needs but in reality it probably wasn't.
I say get the ton of lime on now, it's cheap here compared to P and I would want the ground 3 more years and double the lime rate because that soil will probably also be slow at changing Ca Mg and P.
Not a long post at all and a great question. How much does it take to resolve a known deficiency? In my experience, it can easily and often takes more nutrient to get the tissue test to say Sufficient in the needed nutrients and when those go up, others start showing deficiency like Zinc, Manganese or Boron.
Great question and I hope you can learn from this experience and grow better crops in the future.
I realize this is put out for everyone to answer although you put my name in the header. My email is always open if it works and you would have emailed me directly if you wanted just my answer.
Jeff gives a big clue why it may be deficient in his reply from his experience and he and I do talk about these things off the board or forum.
Ed | |
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Ed Winkle, soil sample question...
