Rothamsted
Researchscientists are making progress in
their efforts to reduce reliance on N fertiliser in wheat
crops.
The Wheat Genetic Information
Network project funded by
DEFRA aimed to improve N use
efficiency in the crop, Malcolm Hawkesford of Rothamsted Research
said.
The initial research looked at how much genetic variation there
was in wheat varieties' response to N, through analysis of grain N
and yield. Further investigation had tried to identify varieties
good at either or both taking up N from the soil, and then
converting it into grain yield, he explained.
"They are two different processes, which the breeders haven't
separated out when breeding new varieties."
The researchers were staggered at how much variation there was
between varieties, he said. "Some varieties are good at one, but
not necessarily the other. It means that there is potential for
improvement."
The next step is pinning down the genetics to understand why.
Advanced genetic techniques, such as double haploid mapping, were
beginning to find candidate genes for breeders to work with.
"The aim will be to maintain yield with less N, or continue with
the same inputs and achieve more yields."
A realistic target might be to reduce N inputs by 20%, he
concluded.
