Click on author name to view affiliation information
Contributor Notes
Recieved for publication 12 June 1987. Advice from J. Hall, Agriculture Canada, on statistical methods is gratefully acknowledged. Trade names are used for information purposes. Mention of trade names does not constitute a guarantee or warranty of the products by Agriculture Canada, nor does it imply an endorsement over similar commercial products. The cost of publishing this paper was defrayed in part by the payment of page charges. Under postal regulations, this paper therefore must be hereby marked advertisement solely to indicate this fact.
Present address: Agriculture Canada, Research Station, 6660 N.W. Marine Drive, Vancouver, B.C., Canada, V6T 1X2.
