https://commons.ufh.ac.za/vital/access/manager/Index ${session.getAttribute("locale")} 5 A critical study of methods for the determination of zinc in soils and plant materials https://commons.ufh.ac.za/vital/access/manager/Repository/vital:4468 Thu 13 May 2021 06:04:39 SAST ]]> A statistical study of the errors involved in the sampling and chemical analysis of soils and plants, with particular reference to citrus and pineapples https://commons.ufh.ac.za/vital/access/manager/Repository/vital:4506 Thu 13 May 2021 04:21:46 SAST ]]>