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Austin MN | Since no one has done the math yet I'll help you out. The p to p2o5 conversion is 2.3. The k to k2o conversion is 1.2.
33lbs P x 2 tons = 66lbs P. 66 x 2.3 = 151 lbs p2o5 = 290lbs of MAP. $700/ton map x 290lbs = $101.50/ ac
54lbs K x 2 tons = 108 lbs K x 1.2 = 129 lbs k2o = 215lbs potash
$600/ton potash x 215 lbs = $64.50/ac
20lbs S x 2 tons = 40lbs S = 166lbs AMS. $400/ton ams x 166lbs = 33.20/ac
I stopped at this point. These three add up to 199.20/ac. That doesn't include calcium, magnesium, any of the micros or application.
As long as the manure is somewhat a homogeneous product, the applicator doesn't streak it, and you can incorporate to keep most of the nitrogen then it seems to be a fairly good deal.
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Chicken litter vs dry fertilizer
