Abstract
A study to prevent or brake bud dormancy in 3 to 4 years old Myrica rubra cv. ‘Biji’ plants under controlled green house and field conditions, was conducted using GA3 and WPM nutrient media as fertigation and drainage. Two batches of the plant were shifted in different growth stages “dormant” and “non-dormant”. Plants shifted in the month of October were in the late autumn growth stage (non-dormant), while plants shifted in the month of December were in a complete bud dormancy stage. Plants of the first batch were prevented to enter bud dormancy while in the second batch bud dormancy was broken by providing warm temperature ranging 25±3°C in the green house. Green house plants took 2-4 weeks to initiate the growth flushes as compared to 17 to 18 weeks taken for the field plants. Buds break and leafs shed in the green house were observed earlier in the plants drained with nutrients media followed by fertigation, while spraying of GA3 delayed leaf shed and increased shoot length both in the green house and in the field. GA3 treated plants sprouted few days earlier than that of control. Significant differences were observed in initial sprouts among the treatments of GA3, nutrient fertigation and nutrient drainage as compared to the control plants. Similarity in days to initial sprout was observed in both the nutrient fertigation and drainage methods with a slight variation of one or two day’s differences. Nutrients used as drainage showed outstanding results than fertigation. Key words: Bud dormancy, gibberellic acid, GA3, Myrica rubra, warm temperature.
Highlights
Myrica rubra with a common name of red bayberry is an important member of Myricaceae family used for horticultural, forestry, ornamental and medicinal purposes
Two experiments were conducted in the green house controlled temperature and relative humidity with the aim to prevent the plants from entering true bud dormancy during the chilling months and/or hasten dormancy in comparison with the plants growing under normal environmental conditions in the field
It was observed that all plants in the field conditions either treated or untreated entered the true winter bud dormancy due to the unfavorable environmental conditions
Summary
Myrica rubra with a common name of red bayberry is an important member of Myricaceae family used for horticultural, forestry, ornamental and medicinal purposes This is one of the endemic species of Far East Asia grown under warm and humid climates. It is grown in China, Japan, India, Thailand, Burma and Vietnam as fruit or forest tree while in America and Europe as an ornamental tree (Wu, 1995; Chen et al, 2004). It is a rich source of tannin, flavonoids, polyphenols and perfumery compounds (Yang et al 2003). Great economic value, low production costs and nitrogen fixing activity, the red bayberry is considered a good economic source for the growers (He et al, 2002; Li, 2002).
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