Posted 3/9/2019 15:10 (#7369655 - in reply to #7369596) Subject: RE: ok, i FIGURED IT OUT
USA&Belize
P availability is highly dependent on the concentration of cations in the soil. The that is why they use different extractions.
I found 15ppm to be a ecomical level for weak extractions. The amount of p205 you need to apply will vary based on cation concentration.