Enhancing abscission of mature macadamia nuts with ethephon
作者:
A. C. Richardson,
T. E. Dawson,
期刊:
New Zealand Journal of Crop and Horticultural Science
(Taylor Available online 1993)
卷期:
Volume 21,
issue 4
页码: 325-329
ISSN:0114-0671
年代: 1993
DOI:10.1080/01140671.1993.9513789
出版商: Taylor & Francis Group
关键词: (2‐chloroethyl)phosphoric acid;ethephon;flowering;fruit drop;Macadamia integrifolia;Macadamia tetraphylla
数据来源: Taylor
摘要:
The effect of (2‐chloroethyl)phosphoric acid (ethephon) on the abscission of mature ‘Beaumont’ macadamia nuts (Macadamia integri‐folia × M. tetraphylla) was investigated in two experiments. In 1988, 6‐year‐old trees were treated with 200 or 400 mg/litre of ethephon, with and without pH neutralisation or a surfactant, 2 weeks after nut maturity. Nut abscission increased from 6% on untreated trees to a maximum of 87% on trees treated with a 400 mg/litre neutralised solution of ethephon which included a surfactant. Trees treated with 400 mg/litre ethephon sprays showed a large but nonsignificant reduction in yield in the following season. A second experiment in 1990 determined the effects of three ethephon rates (400, 500, and 600 mg/litre) applied on three separate dates (nut maturity, nut maturity +2 weeks, and nut maturity +4 weeks). In this study 70% of nuts abscissed after the final application compared to only 7% on untreated trees. However ethephon applied 2 or 4 weeks after the nuts matured caused significant flower damage and crop loss in the following season. Despite the enhancement of abscission rates, ethephon cannot be recommended for application to ‘Beaumont’ macadamia trees in New Zealand because of the loss of subsequent yields.
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