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Seasonal N Uptake

Seasonal pattern of N in walnut trees.
Nitrogen uptake from soil starts after bud break and is greatest between the onset of shoot growth and the latter stages of nut fill ^[1,4].

Nitrogen Partitioning

Nitrogen distribution in 16-year old 'Hartley' walnut trees with a yield of 2.2 tons/acre ^[4].

Nitrogen Removed at Harvest

Nitrogen removed with harvested walnuts. The value includes all nutrients removed in hulls, shells and kernels. The overall average is weighted for the number of observations in each trial. More information can be found here ^[3].

Links

Walnut Fertilization Guidelines

References

1. Anderson, K.K., Grant, J., Weinbaum, S.A., Pettygrove, S., 2006. Guide to efficient nitrogen fertilizer use in walnut orchards. University of California, Agriculture and Natural Resources. Publication 21623.
2. DeJong, T., Pope, K., Brown, P., Lampinen, B., Hopmans, J., Fulton, A., Buchner, R., Grant J., 2015. Development of a nutrient budget approach and optimization of fertilizer management in walnut. Walnut Research Reports 2015.
3. Geisseler, D., 2016. Nitrogen concentrations in harvested plant parts -A literature overview. Report to the Kings River Watershed Coalition.
4. Weinbaum, S.A., Murooka, T.T., Gatlin, P.B., Kelley, K., 1991. Utilization of fertilizer N by walnut trees. The Walnut Marketing Board of California. Walnut Research Reports 1991, 317-334.