Relative agronomic merit of fused calcium phosphate, 3: Forms of phosphorus in soils repeatedly cropped in pot experiments

analyse de sol analytical methods clay soils fertilidad del suelo fertilisation fertilizer application fosforo loam soils mineralisation mineralization ph phosphore phosphorus plantas plante plants pot experimentation residues residuos sandy soils silty soils soil fertility soil testing sol argileux sol limoneux sol sableux sol sablolimoneux suelo arcilloso suelo arenoso suelo franco suelo limoso superfosfato superphosphate technique analytique