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Seed Morphology, Germination and Seedling Survival of Albizia Trees in the Nursery

M. A. Matin
Silviculture Genetics Division, Bangladesh Forest Research Institute, P. O. Box 273, Chittagong,

M. H. Rashid
Silviculture Genetics Division, Bangladesh Forest Research Institute, P. O. Box 273, Chittagong,

Abstract/ Executive Summary:

Morphological characteristics of the fruits and seeds, seed germination and seedling survival rate of seven albizias were studied in the nursery. The fruit size and weight were the highest in A. lebbek and the highest number of seeds per fruits was found in A. falcataria. The rate of untreated seed germination was tried in the seed tray, poly bag and seed bed. The highest germination was found in A procera (76 - 85%) in all conditions and in A. falcataria (85%) only in the seed tray. The germination rate of A. leb bek was very poor in all the conditions. The germination period had no effect on the percentage of germination. The germinated seedlings in the seed tray and seed bed showed cent percent survival after 7 days transplanting into the poly bags in the shade and the survivality was 85 to 98% in the open sun after 30 days. No significant difference in survival was observed between the seedlings transplanted from the seed tray and seed bed.

Keywords: Seed of Morphology, Seedling Survival, Nursery, Trees.

Location: Chittagong and Khagrachari hill districts

Start Date: 01-07-1990

End Date: 30-06-1991

Program Area:

Commodity:

Objectives:

to determine the survival percentage of the transferred seedlings in shade vs. open sun.

Methodology:

The seeds of A. falcataria, A. lebbek, and A. odoratissima were collected from Chittagong and Khagrachari hill districts in February, A. chinensis and A. procera from Chittagong in March, and A. Lucida and A. richardiana from Chittagong and Dhaka botanic garden in April 1990. The ripe fruits were collected directly from trees, and dried for a week in the open sun. The seeds were then separated from the pods by hand and dried again in the sun for another week. Measurements on fruits were taken from unopened fruits and on seeds before putting them into the germination test. The germination trials were made in round plastic seed tray (24.5 cm dia.), transparent poly bag (10 cm x 15 cm) and in open nursery seed bed on pucca floor of a nursery. In all the cases, soil was mixed with cow-dung in 3 : 1 ratio by volume. In all the three conditions (seed tray, poly bag and seed bed), 100 seeds were directly sown without any pretreatment having three replications. The number of seeds germinated was. recorded every day in each condition by counting the number of seedlings germinated. The germinated seedlings from the seed trays and seed bed were transplanted into the transparent poly bags (10 cm x 15 rn) at the age of 2 weeks, to determine the survival percentage of the transferred seedlings in shade vs. open sun. The air temperatures and relative humidity were recorded and these were from 28 to 35°C and 52 to 69% respectively during the experiment.

Source of Information: Bangladesh Journal of Forest Science Vol. 21 (1 & 2) :40-45, 1992, ISSN-1021-3279.

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The results suggest that A. lebbek seeds do not germinate well without pretreatment of seeds. Among the three conditions, success of germination was better in the seed tray and poly bag than the nursery seed bed condition. In case of the seed tray, the seeds are first sown and seedlings are transferred into the poly bags. It is a two-stage process and requires much labour and time. However, when the seeds are very small, the use of seed tray may be a better option. Direct sowing of seeds into the poly bags may be done by sowing more than one seed per poly bag. The use of poly bag has some advantages.

Knowledge Management: Journal