“Producers need to be thinking about how to deliver nitrogen to
that crop in April and early May when it is taking up nitrogen like
gangbusters,” said Peter Scharf. “The key issue is the earlier you apply
it, the more risk that it won’t be there in April and May.”
February is when a lot of producers top dress, but that might not
be the ideal time. “In our research, March is a considerably better
time,” said Scharf, who is also a professor of plant science in MU’s
College of Agriculture, Food and Natural Resources.
In 17 tests comparing nitrogen application in February versus
March, the March application averaged seven more bushels of wheat yield
per acre. March beats January by 20 bushels, so even though it helps
logistics to apply earlier, Scharf says it probably hurts in terms of
delivering that fertilizer to the wheat crop.
However, if there is a very thin stand coming out of the winter,
Scharf recommends that producers get out soon and apply fertilizer to
stimulate new tillers.
“Each plant should have the main stem that was the first leaf
coming up, but it should also have at least two good tillers on it,” he
said. “Those are side shoots that come off to the side of the plant, and
they will form heads that will have grain on them. They are a very
important part of the total grain production. If there are not enough of
them, grain production will be substantially limited by that.”
Tiller formation has ended by the middle of March. Nitrogen applied
between mid-February and March 1will stimulate the formation of new
tillers.
While nitrogen supports rapid shoot growth and grain fill as well
as new tillers in the spring, applying phosphorus in the spring has
little effect on yield, Scharf said. Although wheat is the most
phosphorus-demanding grain, phosphorus is needed in fall application.
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