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Senior Contributor

Hot weather doesnt matter?

Im puzzled.  Major networks are warning of excessive heat and humidity thru the corn belt stressing crops. Ag shows dont mention it at all. In fact some say its needed. Whats true?  Also some say hasnt rained in weeks causing deep cracks in the formerly saturated soil hurting pollination and root structure!    Fake News?!

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Veteran Advisor

Re: Hot weather Does matter

The past 2 weeks have helped the crop. 

It sorted some of the shallow rooted and the heat units caught the rest up to speed maturity wise. 

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Senior Advisor

Re: All plants, including corn exhibit a physiological phenomenon called dark respiration.

All plants, including corn exhibit a physiological phenomenon called dark respiration. Essentially it is all the biochemical activities that plants do to maintain themselves even when it's dark.  During the day, photosynthesis offsets this dark respiration with the production of new energy compounds but at night dark respiration uses stored metabolites.

  The problem is, this dark respiration depends on temperature, namely it increases directly with temperature. It's well understood that for corn  night time temperatures above 80 deg F dramatically consumes metabolites that would otherwise be available for growth and yield.

  Therefore, prolonged periods of night time temperatures above 80 deg F lead to reduced yield.

Not only that, but high daytime temperatures lead to increased water loss by transpiration.  When the crop, can not replenish moisture fast enough, the plant responds by closing stomata to save water.  This leads to less carbon dioxide exchange, carbon dioxide being necessary for photosynthesis.  Less photosynthesis leads to less yield. 

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Veteran Advisor

Who cares? Fact

Is this is a lower than expected yield crop in the making. 

Those that can't see it,  are not looking. 

USDA talked 166bpa.

Jeez what a ride. 

Say 140bpa is maybe what's truly achievable. 

More importantly is harvested acres..... I'm thinking more like 75 million Vs USDA at 89 million. 

Say 155bpa on 70 million acres is where we'll be.  Mo