I usually get a fall soil test to see whaere my numbers are at, I usually add humic acid, and any potassium that I may need as it takes longer to break down. I always put a winter cover crop of Winter Rye down.
In the spring I get a soil test and try to balance it the best I can as per the test results, no matter what the results are, I add kelp meal, usually about 50 lbs per 1500 sq. ft tilled in well.
I'll only use certian products to raise my levels after a little testing and getting tissue tests done on a few different plants to see where the nutrient levels were at in the first week of august.
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