This definition appears somewhat frequently
See other definitions of PSP
Samples in periodicals archive:
For many years the Prairie Shelterbelt Program, operated out of the Shelterbelt Centre at Indian Head, Saskatchewan by the federal government’s Agriculture and Agri-Food Canada, has contributed to the establishment of farm shelterbelts by supplying trees to farmers at no cost. The applications for the 2011 season started on June 1. Information is available at most provincial agricultural offices, by phoning 866-766-2284, emailing agroforestry@ agr.