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| What is the highest rate of dry potash you have applied at one time? Say 400 lba?
Have you ever applied dry manure to supply 200 lb K2O per ac?
Try each on a small area and see what happens. You may see that manure magically makes K more available.
On my 15-20CEC NT silt loams at 4-5% SOM, 65-75% Ca and Mg % < 14 the soil to plant K relationship is ~100:1 in legumes....ie a 350-400 lba soil K = 3.25% leaf K. When Mg% is closer to 18, we begin to seen poor N efficiency in grass crops but K is still sufficient in leaf. This means we are either moving K from soil to plant in an organic cycle or the stimulated biology is liberating K from silt ores.
So in my mind your K issue is either in application rate/form, SOM, or slight excess of Mg.
FYI...we find manure and high cal ag lime to be very rewarding long term on loam to silt loam texture without spending a fortune. | |
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Making Potassium more available.
