Fall-applied potash & phosphorus leaching factors, hard data

[rickgthf]

Some of my neighbors are applying some of their next year's potash & phosphorous now, here in the higher rainfall Northeast.  I'm skeptical about the losses.

Anybody have some hard data on leaching losses in relation to rainfall for fall-applied fertilizer?

[BA Deere]

Phosphorus will probably stay put. Potash will leach in low cation exchange soil (sandy) there`s no room to push aside hydrogen to attach to a soil colloid, higher the pH the less exchangeable hydrogen.   I wouldn`t waste money building K on soils with a higher than 6.5 pH.

So, it depends on what soils and soil tests you guys are dealing with