ppm
Parts per million, equivalent to milligrams per litre (mg l-1), used for pollutants, foliar analysis etc.
This definition is abridged from A – Z of tree terms: A companion to British arboriculture.
Read the preface. Order the book.
Parts per million, equivalent to milligrams per litre (mg l-1), used for pollutants, foliar analysis etc.
This definition is abridged from A – Z of tree terms: A companion to British arboriculture.
Read the preface. Order the book.