Wheat School: Heat takes a bite out of wheat

Episodes:

“It is hot!” says Peter “Wheat Pete” Johnson in this episode of the Wheat School. And that heat is taking a bite out of wheat yields.

Wheat is a cool season crop and does not like heat, so when temperatures start to climb yield can be impacted.

The most critical stage is at filling. It takes about 660 growing degree days (GDD) to fill the wheat head, on average. Short season varieties are maybe more around 600 GDD. What’s a growing degree day you might ask? Simply put it is the high temperature of the day plus the low temperature of the day, divide by two. A perfect day in a wheat crop’s life is an 18 degree C high, and a 10 degree C low — a far cry from summer temperatures in Ontario right now.

(See video for an example of the math and how that impacts the number of  grain-filling days, story continues below)

Eastern Canada, particularly Ontario, is getting some extreme heat lately, with daytime highs above 32 degrees C and nighttime lows at 22 degrees C.

As the number of GDD accumulate faster from all this heat, the number of grain-filling days shortens. A 26-day grain fill period versus the average 33-day grain fill period means less potential for yield. This is why sometimes those early seeded wheat crops can pay because their grain-filling period catches more of those cooler days, Johnson says.

Leave a Reply

 

This site uses Akismet to reduce spam. Learn how your comment data is processed.

Privacy Preference Center

Necessary

Necessary cookies help make a website usable by enabling basic functions like page navigation and access to secure areas of the website. The website cannot function properly without these cookies.

gdpr, __cfduid, PHPSESSID, wordpress_test_cookie, woocommerce_items_in_cart, woocommerce_cart_hash, wp_woocommerce_session, wordpress_logged_in, wordpress_sec, wp-settings, wp-settings-time, __cf_mob_redir, wordpress_cache, realag
__cfduid

Marketing

Measuring interactions with the ads on the domain.

__gads,fsk_ut_2317
scmtid,v,a,JSESSIONID
IDE

Statistics

These are used to track user interaction and detect potential problems. These help us improve our services by providing analytical data on how users use this site.

_ga,_gid,_gat,_cb,_chartbeat2,_chartbeat4
_ga,_gat
_ga,_gid
metrics_token

Preferences

Preference cookies enable the website to remember information that changes the way the website behaves or looks, like your preferred language or the region that you are in.

chartdefaults, comment_author, comment_author_email, comment_author_url
JSESSIONID, _os_session,anonymous_votes,csrf-param,csrf-token,user,user-id,user-platform,intercom-session,intercom-lou,intercom-session
personalization_id, tfw_exp

 

Register for a RealAgriculture account to manage your Shortcut menu instead of the default.

Register