November/December 2020 - 16

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Correct nitrogen
type, timing to meet
category specifications
Potato growers who want to more accurately
meet their 2021 contract obligations should
consider the use of managed fertilizer
applications to manipulate tuber size and increase
marketable yield, according to new field research
investigating the use of a stabilized amine
nitrogen (SAN) technology that's now available
to U.S. growers.
The research, conducted in the United Kingdom
- responsible for nearly ten per cent of European
potato production - showed that by deploying
a carefully managed SAN application schedule
during the growing season, growers could easily
and accurately manipulate tuber size to suit a
particular market - chipping, frying, salad and so
on - while increasing marketable tuber numbers
by up to 16 percent.
" Many growers will already be aware that not
all types of nitrogen are created equal, " says
Dr David Marks of Levity Crop Science, who
conducted the research and presented the
results at this year's Crop Production in
Northern Britain conference.
" We're accumulating more and more evidence
that even when the total amount of nitrogen
supplied to the crop is the same, the form
of nitrogen in which it is applied - nitrate,
ammonium, urea, amine - can significantly
influence crop growth and final yield, " he explains.
This is because important plant regulatory
functions exhibit specific characteristics
in response to different forms of nitrogen.
Recognizing this appearance - known as the
'phenotype' - is key to using nitrogen more
effectively and more efficiently, says Dr Marks.
" For example, use of nitrates stimulates leafy
growth and apical dominance - meaning that
vertical growth is greater than lateral growth.
Not only does this result in the characteristic
'leggy' appearance, but it also inhibits lateral
root production.
" Ammonium, meanwhile, leads to plants with the
same amount of biomass as nitrate-treated crops
but more of the biomass tends to be found in the
roots and tubers. "

November/December 2020

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