Vol. 8 No. 2
Effect of growing degree day (GDD) on different growth processes of Wheat (Triticum aestivum L.)
Author(s): S. BASU, M. PARYA, S. K. DUTTA, S. JENA, S. MAJI, R. NATH, D. MAZUMDAR AND P. K. CHAKRABORTY
Abstract: The sensitivity of wheat to the changes in temperature is well known but is not quantified properly in the Indo-Gangetic plain zone. Phenophases of wheat are altered due to temperature sensitivity. The GDD requirement for different pheriophases may assess the impact of temperature sensitivity. With this background, a three year experiment (2005-06, 2006-07 and 2007-08) was conducted on five wheat varieties (V1-PBW-343, V2-HD-2733, V3-HW-2045, V4-PBW-533 and V5-K9107) sown on three different dates (18th November, 3rd December and 18th December) to assess the impact of growing degree day (GDD) on different growth processes in wheat. Results showed that the GDD significantly predicted the stem weight during sowing to CRI, CRI to tillering and flowering to milking. Leaf weights during sowing to CRI and CRI to tillering were significantly affected by the GDD requirement. GDD requirement during sowing to CRI and flowering to milking acted as significant predictor of ear weight of wheat at flowering and milking. Number of tillers at tillering, flowering and milking was significantly affected by the GDD requirement at the different phenophases. About 44% variation in tiller number at tillering could be ascribed to the variation in GDD requirement at the different phenophases. The tiller number at flowering was highly significant when the variation in GDD requirement during tillering to flowering and CRI to tillering was considered.
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