00000nam 2200000zi 4500 9.944392 CaOODSP 20241023112841 m o d f cr cn||||||||| 241023e197304##abcd ob f000 0 eng d CaOODSP eng rda CaOODSP n-cn-ab CW69-37/26E-PDF Patterson, J. H. (James Howard) author. Ecological considerations of herbicide use in Alberta / J.H. Patterson. Edmonton, Alberta : Pesticide Section, Canadian Wildlife Service, April, 1973. 1 online resource (24 pages) : graphs. text txt rdacontent computer c rdamedia online resource cr rdacarrier Manuscript reports ; no. 26 Digitized edition from print [produced by Environment and Climate Change Canada]. Includes bibliographical references (pages 21-24). "The majority of herbicides presently in use are employed for selective weed control in agricultural crops. Evaluations of the performance of such herbicides are primarily based on the efficiency of the chemical in controlling unwanted vegetation and the tolerance of the crops. However, cropland monocultures are, by fundamental ecological standards, simple and highly unstable ecosystems"--Page 13. Herbicides Environmental aspects Alberta. Ecology Alberta. Herbicides Aspect de l'environnement Alberta. Écologie Alberta. Canadian Wildlife Service. Pesticide Section, issuing body. Manuscript reports (Canadian Wildlife Service. Pesticide Section) no. 26. (CaOODSP)9.938904 PDF 1.75 MB https://publications.gc.ca/collections/collection_2024/eccc/cw69/CW69-37-26-eng.pdf