Standardisation of shade requirement in Dendrobium
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Date
2001
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Department Of Pomology And Floriculture, College Of Horticulture, Vellanikkara
Abstract
An experiment was carried out in the Department of Pomology and
Floriculture, College of Horticulture, Kerala Agricultural University, Thrissur,
during 2000-2001, to standardize the shade requirement for Dendrobium variety
Sonia Born J 0 and Renappa. The effect of different levels of shade on the
morphological characters, flower production and quality of flowers were assessed.
Results revealed that the different levels of shade significantly
influenced the morphological characters of the plant, viz., plant height, shoot
production, internodal length, leaf production and leaf area. Maximum plant height
was obtained for fifty per cent double level shading. With respect to shoot
production, 25 and 35 per cent double levels of shade performed better. The length
of the internode was maximum for 50 per cent double level shading. Highest leaf
production was noticed in 35 per cent double level shading which was statistically
on par with 50 per cent double level of shade.
Flower quality and flower production were markedly influenced by
shade. Earliness in flowering was observed for those treatments receiving more
light condition. Twenty five per cent single level shading was the earliest to flower
in the group, while the longevity of the spike on the plant was more in 50 per cent
single and double levels of shade. Vase life was significantly high in 25 per cent
(15.50 days) and 50 per cent (14.88 days) double levels of shade. Longest spike
was obtained in 50 per cent single level shading, while the length of the rachis was
maximum in 50 per cent double level shading. Fifty per cent single level shading
was distinctly superior to all other treatments with respect to the number of flowers
per spike. Maximum spike production was noticed in 25 per cent double level
shading. Anthocyanin content in flowers was found maximum under 50 per cent
double level shading.
Total chlorophyll and its components 'a' and 'b' in the leaf were
significantly influenced by the different shade levels. Highest content of
chlorophyll 'a' was obtained in 50 per cent double level shading, while chlorophyll
'b' and total were maximum for thirty five per cent double level shading.
Dry matter accumulation was maximum under 25 per cent double level
shading. Nutrient content within the plant indicated an influential effect of shade.
Total nitrogen and phosphorus content were maximum in fifty per cent double
level shading. Thirty five per cent single level shade had maximum potassium
content. A similar trend was observed in the uptake of nutrients also.
Description
PG
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Citation
171987