Jeff Franklin is sharing this week the main observations of the season in terms of temperature until August 31. Always good to remember, this information is coming from Kentville Research Development Centre (KRDC), therefore, some differences 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 August 31.
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) |
1639.8 |
1492.0 |
1610.7 |
1678.3 |
1581.5 |
1589.1 |
|
Insect development
(Base 10º) |
1027.5 |
873.9 |
1009.1 |
1021.4 |
959.4 |
959.5 |
Figure
1. Degree day accumulations as of August 31, 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.
At this time it’s possible to see an increase of heat units compared
to the last update on August 12 (more information in Weather
update: temperatures dropped, and precipitation increased). Only 2018
is slightly higher with 1027.5, while 2020 is slightly lower with 1009.1,
compared to the current accumulation of 2021 with 1021.4. When the values are
compared with the 5 and 10 year average the difference for both are quite
similar, 2021 is ahead with 62 units.
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 August 31,
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.
In this graph, it’s possible to observe the similarities
between 2018, 2020 and 2021, with only a small difference difficult to be
distinguished. Also, the average of the last 5 and 10 years is clearly lower
than the current season. It’s interesting to note that the highest accumulation
is in 2012, which has been highlighted through this growing season.
Finally, some varieties have just turned to veraison or
depending the location are in process to be, thus it’s important to remind that
this period is an opportunity to collect tissue samples for nutrient management
purposes. More information it can be found in the following link Veraison
and tissue sampling.
In the following photo it’s possible to observe a grapevine starting
veraison.
Figure 3. Pinot noir