effect of the soil/solution ratio on the amount of available phosphorus extracted from 18 soils of southeastern Nigeria using the Bray P-1 and Bray P-2 methods
Unamba-Oparah, I ; Kemakolam, C.E
Beitrage zur tropischen Landwirtschaft und Veterinarmedizin, 1985, Vol.23 (4), p.373-384