B.C. Ministry of Forests Forest Science Program
			Abstract for Research Report 93002-HQ

		Site-specific Relationships of Root Growth Potential to Outplanting Performance of Coastal Douglas-fir ( Pseudotsuga menziesii [Mirb.] Franco) Under Controlled Irrigated Field Conditions
		Authors or Ministry Contacts: R.K. Scagel, W.D. Binder, and G.J. Krumlik
		Branch: Research
		Subject: Tree Planting
		Series: Research Report
		Other details: Published 1993

Abstract

Root growth potential (RGP) of a range of Coastal Douglas-fir Pseudotsuga menziesii [Mirb.] Franco) stocktypes and lift dates was examined as a predictor of site-specific outplanting performance under farm-field conditions of three experimentally controlled irrigation regimes. RGP test results were highly variable. The irrigation regimes resulted in site-specific mortality, growth, and form. RGP was weakly related to mortality and growth, but only for the very driest irrigation regime. For predicting survival or growth of Coastal Douglas-fir under different experimental field moisture regimes, the RGP test is of little use. These results raise questions about the use operational utility of RGP where handling, planting, and climate may further confound the relationship between RGP and plantation survival and performance.

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