HDR had a positive direct effect on V, and this was significant or highly significant, except for the 2–3-year-old M × D population; the indirect relationship showed that, except for the 4–6-year age stage, HDR’s indirect effect on V was significantly negative.
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Comparative Study on Growth Characteristics and Early Selection Efficiency of Hybrid Offspring of <i>Populus deltoides</i> 'DD-109' and <i>P. maximowiczii</i> in Liaoning, China.
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