Guidelines for Yield Assessment of Opium Gum and Coca Leaf from Short Field Visits (S)

"These Guidelines are aimed at national authorities, which are interested, in the context of illicit crop monitoring programmes, to improve their yield and, ultimately, production estimates. General principles and the theoretical background to yield assessment methodologies are discussed, and outlines of practical procedures at the field level for using, testing and/or developing methods are provided, for both opium poppy and coca bush."--Publisher description.