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NPR Vol.6(4) [July-August 2007] >


Title: Flowering performance of Polianthes tuberosa Linn. cv. ‘Calcutta Double’ as influenced by thermal regime
Authors: Khan, Arpita
Saha, Abhijit
Pal, P
Keywords: Tuberose
Polianthes tuberosa
Tuberose cv. ‘Calcutta Double’
Air temperature
Flowering performance
Performance indicators
Issue Date: Aug-2007
Publisher: CSIR
IPC CodeInt. cl.8 A01G 9/00
Abstract: In order to study the role of climatic parameters on different performance indicators of tuberose, Polianthes tuberosa Linn. (Double type), an experiment was carried out at Horticulture Research Farm, Bidhan Chandra Krishi Viswavidyalaya (BCKV), Mohanpur, District Nadia (West Bengal) during 2002. The crop was planted on 28th March 2002 with standard cultural practices. Dates corresponding to emergence (E), appearance of first (FFO) as well as last floret (LFO) corresponding to each tagged spike (27th October to 29th December 2002) were noted. Maximum and minimum temperature regime enjoyed by each spike during E-FFO and FFO-LFO stage were utilized to derive different thermal indices to study the rate of phenological development as well as status of different performance indicators. Correlation studies showed that all the thermal indices pertaining to E-FFO stage and CHU (Cumulative heat units) during FFO-LFO stage were highly associated with different performance indicators. Regression studies showed that value of these indices during E-FFO stage could explain 55-82% variability of different indicators. Rate of reproductive development during E-FFO has been found to be a quadratic function of mean temperature (R2=0.74) where 21-22oC mean air temperature showed maximum rate. Relationship developed in this study can be useful for predicting the performance of tuberose ahead of the harvest and assessing its worthiness in the market. A mean air temperature around 22oC during E-FFO is useful in early harvesting as well as obtaining higher rachis length and thereby the market value of this crop.
Page(s): 322-326
ISSN: 0975-1092 (Online); 0972-592X (Print)
Source:NPR Vol.6(4) [July-August 2007]

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