Hulme, Sampie A.Sumner, Malcolm E.Farina, Martin Patrick Warner.2015-04-232015-04-2319701970http://hdl.handle.net/10413/11990Thesis (Ph.D.)-University of Natal, Pietermaritzburg, 1970.Abstract available in pdf file.en-ZASoil chemistry.Potassium.Soils--Potassium content.Theses--Crop science.Thesis