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Seasonal N Uptake

Nitrogen uptake of wheat determined by harvesting the aboveground biomass at different times during the growing season.
Wheat took up little N until tillering. Most N was taken up between tillering and flowering ^[4].

Nitrogen Partitioning

At maturity, about three fourths of the aboveground N has been found to be in the grains, while one fourth is in the straw ^[2,4].

Nitrogen Removed at Harvest

Nitrogen removed with harvested grains of common and durum wheat. The overall average is weighted for the number of observations in each trial. More information can be found here ^[1].

Common wheat

Durum wheat

Data is derived from protein content reported from 2013-2015 in the California Wheat Variety Survey ^[3]. The N content in wheat grains is generally calculated by dividing the protein content by 5.7 ^[5]. Only locations in the Central Valley were used.

Links

Wheat Fertilization Guidelines

References

1. Geisseler, D., 2016. Nitrogen concentrations in harvested plant parts -A literature overview. Report to the Kings River Watershed Coalition.
2. Linquist, B.A., Cassman, K.G., Fulton, A.E., Jackson, L.F., 1992. Late-season nitrogen may be efficient way to increase winter wheat protein. California Agriculture 46 (2), 13-16.
3. Mayo P., Prato D., Fraser J., Jackson, L., Gallagher, L.W., Chicaiza, O., del Blanco, A., Maciel, F.T., Culp, D., Banuelos, G., Kirby, D., Wilson, R., Marcum, D., Marsh, B., Orloff, S., Lundy, M., Munier, D., Wright, S., Dubcovsky, J. Regional barley, common wheat and triticale, and durum wheat performance tests in California.
4. McGuire, A.M., Bryant, D.C., Denison, R.F. 1998. Wheat yields, nitrogen uptake, and soil moisture following winter legume cover crop vs. fallow. Agronomy Journal 90, 404-410.
5. Undersander, D., Mertens, D.R., Thiex, N., 1993. Forage analyses procedures. National Forage Testing Association, Ohama, NE.