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Studis on Fruit Size,seed Production and Viability of Seeds of Keora( Sonneratia Apetala)

Md. Rafiqul Islam
research Officer
Plantation Trial Unit Division, BFRI, Barisal

Neaz Ahmed Siddiqi
Divisional Officer
Plantation Trial Unit Division, BFRI, Barisal

Abstract/ Executive Summary:

Data on the availability of different sizes of fruits, seed production according to size classes, germination success and viability of seeds of Sonneretia apetala Buch-Ham. were collected during 1984-85 from the Chittagong coastal area. The fruit dropping period extended from late July to early October. Fruit size varied and proportion of medium sized fruits was high. No significant difference in germination success was detected when seed from different fruits size classes were collected and sown. Viability of seeds declined with passage of time in the laboratory as well as under field conditions. No seed germinated in the field when after 60 days of fruit collection.

Keywords: Keora seeds, Coastal afforestation, Nursery technique, Fruit size

Location: Chittagong

Start Date: 00-00-1984

End Date: 00-00-1985

Program Area: Seed Technology

Commodity: Keora

Objectives:

To obtain information on phenology,seed quantity and germination performance of seeds of keora in the laboratory as well as under field conditions.

Methodology:

The phenology of the species was studied in the Sundarbans forest which was the initial source of seed supply for the coastal afforestation. To determine the number of seeds per fruits of S. apetala were collected at random from an eight year old plantation in the chittagong coastal area. The fruit were measured, weighed and graded in to various size groups- A ( very large, diameter >26mm) B ( large, 23-26mm). C (medium 20-23mm) and D (small,<20mm). Seeds from various groups were collected, sun-dried and placed in to germination performance from different size groups of fruits.Unpredictable heavy showers are one of the main causes for repeated nursery failure because seeds are washed away from the beds. So, it was necessary to see if nursey raising was possible after monsoon. In addition, nursery raising in the post monsoon period would ensure a year round supply of seedlings for planting out. The fruits were kept in a heap and it took about 15 days for the decay of the fleshy portion of the fruits. Fruits were collected from the same stock/heap at 15 days intervals and washed in water to separate the seeds. On the next day, the seeds were sown in the petridishes as well as in the field near Patenga, Chittagong, where the experiment was laid out in RCBD with 3 replications and 5 treatments. The size of the plots was 1.2 x1.2m and each plot was sown with 80g (2300nos) of seeds. First sowing was made on 2nd September,1985.

Source of Information: Bono Biggyan Patrika 1988, 17:91-93

Article Link (Online Journal):

Funding Source:

1. World Bank

Budget:

Total Budget (Tk.) :

Achievement/Findings:

A significant difference in respect of germination performance was found between laboratory and field conditions. Germination percentage in the nursery beds was much lower compared to that of the laboratory conditions.Salinity may be one of the causes for gradual decreases in germination performance in relation to passage of time . In view of the apparent decline in germination success with increasing soil salinity, raising of keora seedlings needs to be undertaken during periods of reduced salinity. Consequently, establishment of nurseries during the post-monsoon dry season is not feasible.

Knowledge Management: Journal