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North of London | You ask a good question that I don't have an answer to but maybe sunlight impacts things as much as heat would be a guess from me.
Filtered sun like with smoke or a lot of cloudy weather could be a factor.
I and many calculating HU's don't have equipment to measure more than the high and low temps and calculate them from the chart for that.
Yes a frost can knock heck out of yield if it burns the leaves before all the starch has been uploaded.
You can have 'bushels' but not tonnes and tonnes is how we sell and use it
Some times I wonder if a variety maturity is listed wrong.
I do remember a variety that was considered a long season and another that was a shorter season that an early frost really knocked heck out of the early variety but the long season variety came through with good yields.
Then I found a chart with dry down of those varieties.
The long season started maturing and drying down quite early so it was safely matured enough when frost hit while the shorter season maturity stayed quite immature or high moisture until a certain point and then moisture dropped like a stone over a short period of time so it was nailed with the frost.
Also noticed some varieties drop moisture like a stair step, drop a ways quickly then plateau for a couple weeks then take another step down.
Hard to find data on how a variety dries down but sure can impact yield and maturity some years. | |
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Corn HU's in Ontario
