Thermal time requirements for phenophases of apple genotypes in Kullu valley

Authors

  • MOHAN SINGH Dr. YS Parmar University of Horticulture & Forestry Regional Horticultural Research Station Seobag, Kullu -175138 (HP)
  • H. S. BHATIA Dr. YS Parmar University of Horticulture & Forestry Regional Horticultural Research Station Seobag, Kullu -175138 (HP)

DOI:

https://doi.org/10.54386/jam.v13i1.1333

Keywords:

Phenophases GDD, HTU, PTU, HYTU and apple genotype

Abstract

A field experiment was conducted at Horticultural Research Station, Seobag (Kullu) from 2004 to 2010. The phenology of ten apple cultivars was observed on every second day on three plants of each cultivar with three replications from bud-bust, green-tip, pink-bud, full-bloom to physiological maturity. GDD, HTU, PTU, HYTU and heat use efficiency was computed from the meteorological data recorded from observatory and averaged of for ten years. Tydeman, commercial and Mollice has taken lower GDD for the physiological maturity but higher for attaining petal-fall. On an average apple required 330 GDD from bud bust to petal fall with 4oC as base temperature. Cultivars completing the rest period earlier used more thermal units and giving good fruit yields as compare to those breaking their dormancy later. Thermal units explain more than 75-99 % variation in fruit yield. Higher thermal use efficiency was observed for Starking Delicious and Vance Delicious followed by Top Red and Tydeman which may be encouraged among the growers.

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Published

01-06-2011

How to Cite

MOHAN SINGH, & H. S. BHATIA. (2011). Thermal time requirements for phenophases of apple genotypes in Kullu valley. Journal of Agrometeorology, 13(1), 46–49. https://doi.org/10.54386/jam.v13i1.1333

Issue

Vol. 13 No. 1 (2011): June

Section

Research Paper

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