Corn School: Emerging seeds need CHUs

How many crop heat units (CHU) does corn need to emerge?

That’s a question many growers are asking as their corn seed shivers through the cold spring 2020 growing conditions. On this episode of RealAgriculture’s Corn School, we put that question to Dale Cowan, AGRIS Co-operative agronomist. He says that corn seed typically requires 165 to 175 CHU for emergence, depending on seeding depth.

But cool growing conditions across Ontario have left corn far short of the heat required to break ground. How cold has it been? Cowan notes that as of May 14, London, Ont. has accumulated only 117 CHUs.

“During the last six days we’ve only accumulated 18 CHUs and during three of those days there was zero accumulation,” notes Cowan. Based on his growth model, corn planted on April 24 will not emerge until May 20-22.

That doesn’t mean growers should be discouraged. Cowan says much of the Ontario corn crop was planted into dry, fit ground and “cold and dry is better than cold and wet. As long as soils aren’t saturated, they’re in pretty good shape.”

Cowan recommends growers spend time scouting fields and digging seeds to identify any issues. “You want to see good, firm seeds; nice white mesocotyls, a nice white root system and all the seeds sprouting at the same time.”

And don’t forget to take a measuring tape, says Cowan. Measure out 1/1,000th of an acre (17.5 feet on 30-inch rows) and do seed counts to identify misses and gaps that could produce a poor stand and determine if you have a planter problem or whether the seed is struggling in the cool conditions.

Click here for more Corn School episodes.

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