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.
Highlights
Weather components have significant impact on the phenology of fruit plants
Keeping the importance of weather parameters on phenology, a study was carried out to characterize the performance of different grape varieties grown under south-western region of Punjab in relation to climatic structure, phenology and their ripening
Numbers of days required for commencement of different phenological events varied among varieties
Summary
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. Keeping the importance of weather parameters on phenology, a study was carried out to characterize the performance of different grape varieties grown under south-western region of Punjab in relation to climatic structure, phenology and their ripening. The number of days to attain various phenophases namely, bud burst, sprouting, panicle formation, anthesis, fruit set and fruit ripening were visually observed from randomly selected five grapevines after pruning (on 11 th January each year).
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have