The effect of dormant shoot heading of mature plum trees on flower bud setting (preliminary results)
2002
Jacyna, T. | Stasiak, K. | Grzyb, Z.
Water shoots (called primary shoots) of eight-year-old trees of either cultivar 'Shiro'(Prunus salicina Lindi.) or 'Queen Victoria' (Prunus domestica L.) were subjected to dormantheading (tipping) to the length from 5 to 25 cm in March. The trees of both cultivars showed different pattern of responses to applied pruning methods. In trees ofcv. 'Shiro', strong shoot heading caused poor regrowth of few short outgrowths (called secondary shoots), which tended to heavily set flower buds. In 'Queen Victoria' trees, however, the same type of pruning brought about the flush of several long secondary shoots with poor ability to set flower buds. Gradual increase of severity of primary shoot heading caused a significant reduction in the number of flower buds in 'Queen Victoria' secondary shoots. This was in contrast with 'Shiro' shoots, which demonstrated great ability to produce more flower buds calculated per primary shoot area unit as the severity of shoot pruning intensified. Regardless of length of shoot heading, the shoots of 'Shiro' plum trees outperformed those of 'Queen Victoria' in the number of flower buds calculated either per shoot or cm2 of shoot area.
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