Wheat School: Where does yield come from? 

When thinking about protecting yield from disease, one of the first things to understand is where yield actually comes from.
Jeremy Boychyn, agronomy research extension specialist with Alberta Wheat and Barley Commissions, understanding how the each leaf of the wheat plant builds yield helps inform decisions on how to best manage risks to yield.
"One of the common themes we talk about is flag leaf versus penultimate leaf, versus antepenultimate leaf. And what we're talking about there is essentially, the flag leaf is at the top leaf of the plant. It's the last leaf that comes out before we see head emergence. The penultimate is essentially the next leaf down from the flag leaf, and then the antepenultimate would be the third leaf down. And then there's F4, which would be the lowest leaf before we get into the tillering leaves," he explains.
When thinking about yield contribution, each of these leaves each contribute a different amount to the final yield, which is why fungicide timing, especially, can become crucial if disease threatens the top two leaves.
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