Jeff Franklin is sharing with us the main observations at the beginning of the season until June 14 in terms of temperature. Always good to remember, this information is coming from Kentville Research Development Centre (KRDC), therefore, difference between locations are possible to be found.
The first table shows the temperature base 5⁰ C and base 10⁰ C from 2018 until 2021 accumulated each year from March 1 until June 14.
At the end of each section, it’s possible to see the average of the last 5 and
10 years respectively.
|
Category |
2018 |
2019 |
2020 |
2021 |
5 year average |
10 year average |
|
Plant development (Base 5ºC) |
410.6 |
364.8 |
392.1 |
507.0 |
416.8 |
438.6 |
|
Insect development (Base 10º) |
184.8 |
135.5 |
179.1 |
239.4 |
182.3 |
196.7 |
Figure 1. Degree day accumulations as of June 14,
2021. All data are taken from the Kentville
weather station, based on a start date of March 1, and calculated using the
single sine method.
As we’ve seen in the last couple of weeks, the degree accumulation shows a high increase compared to the last 3 growing seasons. Based on 10⁰ C, 2021 has 239.4 which is above the average temperature of the last 5 and 10 years with 135.0 and 152.6 respectively. Last week on Monday June 7 and on Tuesday June 8 the temperatures reached maximums above 30⁰ C. These days contributed to increase the accumulation of heat units to very high values.
In the following column graph, it’s possible to see the values from 2004 until 2021 and at the end you can see the average of the last 5 and 10 years respectively.
Figure 2. Degree day accumulations as of June 14,
2021 base 10⁰ C.
All data are taken from the Kentville weather station, based on a start
date of March 1, and calculated using the single sine method.
This graph highlights the difference with the last 3 years
and shows differences between 2021 with 2017. In the previous publications we
observed similarities and even higher accumulations in 2010 and 2012. However, currently
2021 has accumulated even more than 2010 and almost the same as 2012. This
increase has impacted in the acceleration of grape growth and phenology;
therefore, bloom can be expected to happen before previous seasons.