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International Journal of Agricultural Research
Year: 2007  |  Volume: 2  |  Issue: 9  |  Page No.: 826 - 831

Seasonal Influence on Phenology and Accumulated Heat Units in Relation to Yield of Baby Corn

N. Thavaprakaash, R. Jagannathan, K. Velayudham and L. Gurusamy    

Abstract: Analytical study was carried out to study the influence of phenology and accumulated heat units of baby corn in different seasons. Baby corn crop was raised during late rabi 2002, kharif 2002, late rabi 2002-03 and summer 2003 seasons. The observations on days required for attainment of different phenophases viz., seedling, peak vegetative, tasseling, silking, first harvest and last harvest were recorded. Heat units such as Growing Degree Days (GDD), Photo Thermal Units (PTU), Helio Thermal Units (HTU), Relative Temperature Disparity (RTD), Heat Unit Efficiency (HUE), Photo Thermal Index (PTI) and Seasonal efficiency were worked for different seasons of baby corn. The yield obtained during four seasons of baby corn crop was related with the different heat units calculated during crop growth seasons. The results revealed that among the different indices GDD, HTU, PTU and RTD had negative relationship whereas HUE, PTI and Seasonal efficiency had positive relationship with yield of baby corn. Thus, the indices such as HUE, PTI and Seasonal efficiency are seem to be effective in taking into account and expressing the effect of varying ambient temperature on the duration between the phenological events for comparing the crop response to the ambient temperature between different phenological stages.

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