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首页> 外文期刊>Acta Horticulturae >Micropropagated vs. grafted 'Chandler' trees in young walnut orchards
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Micropropagated vs. grafted 'Chandler' trees in young walnut orchards

机译：Micropropagated vs. grafted 'Chandler' trees in young walnut orchards

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摘要

The response of micropropagated (M) and grafted (on walnut seedlings, G) 'Chandler' trees to the current training techniques for central leader system is being compared in a number of commercial orchards of the Emilia-Romagna region (44-45°N), Italy. In an orchard planted in winter 2016/17 using 0.10-0.20 m, 8-month-old M and 1.85 m, 33-month-old G trees, spaced 7×5 m (286 trees ha~(-1)), the length of the shoot selected as the leader, the number of leaves and of the sylleptic shoots on the leader were recorded at 15- to 30-day intervals throughout the first growing season. Except for the beginning of the growing season, where M trees showed a more vigorous growth resumption, the growth rate of M and G trees did not show significant differences during the season. The vigor, internode number and length of the leader of M vs. G trees at the end of the 1~(st) growing season were studied in 7 additional orchards, established the previous year (winter 2015/16) and with the same planting system. The bud-break percentage in the 2~(nd) growing season following the head-back and partial disbudding of the terminal portion of the leader, was recorded as well. Regardless the orchards, the M trees resulted comparable or 10-15 higher than G trees, although the M material at planting was younger and undersized compared to G material. Moreover, variability in tree size was lower in M trees, allowing more homogeneous trees in the orchard, which is an important requisite in the modern walnut industry.

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