Have had gps soil sampleing this fall, and want to use P rates to use as a basis to build a vairable rate NH3 map. My question is what n credit do we give the soybean ground, 1) a strait rate of 40 lbs /ar 2) 1 pound n credit per bu soybeans grown, 3) some other sliding scale. Also anyone work with soiltypes to write a rx?
VRT NH3
