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progree

(12,240 posts)
Sun Jul 27, 2025, 12:48 AM Jul 27

Corn could be the reason we're feeling hot temperatures (corn "sweating" adds up to 10 deg to the feels-like temp)

I changed the title: it had "Corn could be the reason we're dealing hot temperatures", I think "feeling" is the better word there.

https://www.cbsnews.com/minnesota/news/corn-sweat-corn-belt-hot-temps/

In the mid to late summer as the corn is maturing, stalks want to stay cool like we do," said Grunzke. "They draw moisture out from the roots and sweat it out. As the corn sweats out, it evaporates in the air and increases moisture content in the air."

A climatologist from Iowa State told CBS News it's a process that can add up to 10 degrees to the "feels-like" temp. The map shows the United States Corn Belt, a region historically dominating the crops' production, which our state is a part of.

((As for what the corn belt is, there is a map. It's centered on Iowa but extends north the southern fifth or sixth of Minnesota - right up to the latitude of Minneapolis. Almost all of Missouri and Illinois and about 2/3 of Nebraska and 1/3 of Kansas is included. And about 1/4 of Wisconsin -Progree))

The entire zone is experiencing extreme heat this week, when you add the humidity from corn sweat it takes those feels like temperatures to dangerous levels.

According to Minnesota Corn Growers Association, roughly 16% of the state's total land area was planted with the crop in 2024. Minnesota is the fourth-largest exporter of corn in the United States.

Evapotranspiration ((corn-sweating -P)) happens every summer. The NWS says it ends once corn stops maturing.
10 replies = new reply since forum marked as read
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SamKnause

(14,394 posts)
1. I'm in the corn belt, Ohio.
Sun Jul 27, 2025, 01:11 AM
Jul 27

I have very large fields of corn growing on 2 sides of my property. Forest at the back of my property, and a pasture to the right, corn on the left and in the front.

It was 97 today and felt like 107. The dewpoint was 75. It was miserable.

Everyday I think about the poor people who work outside and in hot factories with no air conditioning.

I feel so sorry for them.

The last factory that I worked at was so hot I got second degree burns on my legs.

I just read an article about Ohio corn sweat to my mom today.

3 to 4 thousand gallons per acre corn sweating.

That is a lot of added moisture for 1 acre.

There are hundreds of acres around me.

progree

(12,240 posts)
3. Yes, I was thinking when I read the article that it sounds like a *lot* of water, and in S. Minn it pretty much all
Sun Jul 27, 2025, 01:27 AM
Jul 27

comes from ground water which is not being fully replenished.

Response to SamKnause (Reply #1)

stopdiggin

(14,241 posts)
5. perhaps. (and interesting) but also keep in mind that corn has been cultivated
Sun Jul 27, 2025, 03:54 AM
Jul 27

in the same mid-western areas - for virtually generations. One has to assume that the corn was 'sweating' back in granddad's day as well.

JT45242

(3,578 posts)
6. Not with the same mass of plants per acre..
Sun Jul 27, 2025, 05:05 AM
Jul 27

The yield of the new varieties is about 180 bushels per acre. The yield pre WW2 was about 30.

That means we should have approximately 6 times more impact.

Add to that global warming and the impact is even higher.

stopdiggin

(14,241 posts)
10. good points. however, the greater point yet - is wrapped up in your final sentence.
Sun Jul 27, 2025, 12:51 PM
Jul 27

If we all turned our hands to marigolds - we would still be experiencing miserable (in some cases dangerous) heat conditions. Yes?

Found this little factoid (now itself several years old) :
Currently the average U.S. corn planting population is just under 32,000 plants per acre and has increased 400 plants per acre per year since the 1960s. If this trend continues, the average U.S. corn planting population will reach 38,000 plants per acre in 15 years and 44,000 plants per acre in 30 years.

So ... Point taken. Corn - particularly with 'new' cultivation practices (and not so much, 'breeding'?) is noted as a (comparatively) quite high bio-mass crop. (also a water use intensive crop)

- - - - - - - - - - - - - - - - - - - - - -

progree

(12,240 posts)
7. Did the article or anything I wrote suggest this is something new or recent?
Sun Jul 27, 2025, 05:55 AM
Jul 27

ETA - well, the title is admittedly simplistic and misleading /end edit

I'm certainly not of the ideology that climate change is a hoax, and that we just THINK it's hotter because suddenly the corn is sweating.

I suspect that other species of plants sweat to a lesser or greater extent, including the prairie and trees that were here before mass agriculture, so I'm not of the ideology that mass agriculture is causing us to FEEL warmer.

There is a huge amount of temperature data collected from a variety of sources that clearly show temperatures have been rising over the decades, and at an increasing rate. That's the main reason we feel warmer than grandad did 40 years ago.

SADAR

(70 posts)
8. I agree. We live in the middle of 6,000 acres of corn
Sun Jul 27, 2025, 07:08 AM
Jul 27

Corn years are awful. When you go outside in the morning, you can watch the "corn fog" start as the sun hits the field. I don't think the corn is "sweating"... all plants transpire, and corn is a master at it.
Corn is also a water hog. There are enormous irrigation sprinklers that add more humidity.
Then there are the "corn flies" aka hoverflies. These little darlings will drive you to insanity. They Love you and want to be close to you...all the time.
Most of the corn grown here is biofuel, which is another topic altogether.
Watched a documentary years ago and there were satellite images of water vapor as the sun came up. The results were amazing, heavy water vapor all in the corn belt, including here in Kentucky.
The takeaway is one can't breathe water vapor and it is a very good at warming the environment.
Next year will be a wheat/soybean year and the water vapor will go down and the corn flies will be less numerous. We like those years!
I like corn, but I think its impact on the environment is more than has been reported.
Frankly, I wish they would grow hemp, but I ain't the farmer!

lark

(25,383 posts)
9. Not here in Jax Fl.
Sun Jul 27, 2025, 09:39 AM
Jul 27

I see us listed every day on the front page of the NYT in either the "Excessive Heat" or "Excessive Rain" categories.

Yesterday the "feel like" temp was 109, today 113 and tomorrow an eye popping 115! It is ridiulously hot, like a blast oven. Plants and trees and animals are all suffering when they ar out in the heat. We have moved our am walk up to 7am and only walking a mile instead of our usual 1.5 miles.

Anyone not believing in climate change that lives in FL is either a total idiot or someone who has no rememberance of the past. Yes, FL has always been hot, but never ever like this. We are watering our plants 2-3 times a day to cool them down. Even our inside/outside cat isn't staying out long in the heat, sometimes he just turns around and comes right back in.

We don't grow corn, much, lol.

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