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Air temperature and the growth of grafted radiata pine pinus radiata



Air temperature and the growth of grafted radiata pine pinus radiata



Australian Forest Research 9(2): 91-100



Buds from a single clone (545A) were grafted onto 1-yr-old radiata pine (P. radiata D. Don) seedlings. When the grafts were well-established the plants were allocated to 1 of 14 temperature treatments for a 10 wk experimental period. The treatments consisted of a range of 5 day temperatures (30, 25, 20, 15 and 10.degree. C). Three different night temperature treatments (3, 6 or 9.degree. C below the day temperature) were used at each day temperature level, with the exception of the 10.degree. C day temperature, where only night temperatures of 7 and 4.degree. C were used. The height increment of the plants was determined for five 2 wk periods. The diameter increment of the plants was also measured and the final weights of the grafts were determined. The height growth response of the plants changed significantly during the course of the experiment. With respect to the mean height growth for the whole experiment and the other measures of growth, the 20.degree. C day temperature levels generally produced the best growth. Differences within the day temperature levels were often not significant at the 5% level of probability. However, growth was usually favored by the relatively cool night temperatures when the day temperatures were warm (30 and 25.degree. C) and by relatively warm night temperatures when the days were cool (15 and 10.degree. C).

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