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- The effects of genetics and tree growth on the presence of spike knots in Scots pine progenies

Family mean height with 95% confidence intervals (bars with whiskers) and estimated probability of spike knots (black dots) in two parallel Scots pine open-progeny trials Daugmale and Norupe located in central Latvia at the age of 12 (a) and 16 (b) years before and after systematic thinning, respectively
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