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Wheat harvest quality: how to improve grain filling for high TKW and high protein rate
Courtesy of TIMAC AGRO International
Thousand kernel weight (TKW) is a yield component, and protein rate is a price component. Both are important parameters to farmers and depend on photosynthetical activity as well as nitrogen availability.
Up to 50% of photosynthetical activity of wheat is due to the flag leaf.
At flag leaf stage (BBCH 39), 80% of nitrogen is already absorbed. However, physiological activity and enzymatic process must keep going :
- Before this stage, photosynthesis enables growth of the crop. From BBCH 39, photosynthates production will go straight to grain for starch production and increase Thousand Kernel Weight.
- Protein content of grains depends on :
- Remobilisation of nitrogen from leaves to grain. Energy, and thus photosynthesis are essential to it.
- 20% of nitrogen will be absorbed during flowering and finition.
To reach those targets, photosynthesis must keep going on as long as possible and nitrogen must be available.
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