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We studied miniaturized seed orchards (MSOs) and conventional orchards of coastal Douglas-fir (Pseudotsuga menziesii var. menziesii) in a series of experiments conducted at three locations in Oregon and Washington between 2002 and 2012. In Experiment 1, cone yields were greater using stem girdles plus stem injections of GA4/7 compared to girdling alone, root pruning, and girdling plus fertilization...
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