Thermal unit requirement of grape (Vitis vinifera L.) varieties under south western Punjab conditions

Authors

  • NAVJOT GUPTA Punjab Agricultural University, Regional Research Station, Bathinda-151001, Punjab
  • RAJ KUMAR PAL Punjab Agricultural University, Regional Research Station, Bathinda-151001, Punjab
  • AMARDEEP KOUR Punjab Agricultural University, Regional Research Station, Bathinda-151001, Punjab
  • S. K. MISHRA Punjab Agricultural University, Regional Research Station, Faridkot, Punjab

DOI:

https://doi.org/10.54386/jam.v22i4.456

Keywords:

Growing degree days, photothermal unit, heliothermal unit, heat use efficiency, fruit yield and varieties

Abstract

Weather components have significant impact on the phenology of fruit plants. In order to study the effect of heat, photothermal and heliothermal units on phenology of grapes, an experiment was conducted during 2016 and 2017 on eleven grape varieties. The weather based indices were used for characterizing the thermal response to various phenophases of different grape varieties. Based on the thermal response the eleven varieties were classified into early, mid and late maturing categories. The fruit ripening was differed by 7-9 days for early, 4-8 days for mid and 1-3 days for late ripening groups. For early, mid and late maturing varieties the accumulated range of growing degree days was 1303-1530, 1617-1712 and 1912-1959 °C day, photothermal unit was 15971-19032, 20201-21484 and 24255-24923°C day. Likewise, minimum heliothermal unit was required by early ripening varieties i.e., Himrod
(9973 °C days) and Madeliene Anguvine (11235 °C days) but, maximum for long duration varieties like Black Muscat (15000 days) and Angur Early (14579 °C days). Maximum and minimum heat use efficiency was recorded by variety Perlette (1.57) and Black Muscat (0.96), respectively. 

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Published

01-12-2020

How to Cite

NAVJOT GUPTA, RAJ KUMAR PAL, AMARDEEP KOUR, & S. K. MISHRA. (2020). Thermal unit requirement of grape (Vitis vinifera L.) varieties under south western Punjab conditions. Journal of Agrometeorology, 22(4), 469–476. https://doi.org/10.54386/jam.v22i4.456

Issue

Vol. 22 No. 4 (2020): December

Section

Research Paper

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