Walnut Nitrogen Uptake and Partitioning

Crops:

Almonds

Barley

Broccoli

Cauliflower

Citrus

Corn for Grain

Corn for Silage

Cotton

Grapevines

Lettuce

Pistachio

Rice

Strawberries

Tomatoes

Walnut

Wheat

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 (Weinbaum et al., 1991; Anderson et al., 2006).

Nitrogen Partitioning

Nitrogen distribution in 16-year old 'Hartley' walnut trees with a yield of 2.2 tons/acre (Weinbaum et al., 1991).

Nitrogen Removed at Harvest

Nitrogen removed with harvested walnuts. The value includes all nutrients removed in hulls, shells and kernels.

Links

Walnut Fertilization Guidelines

References

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.

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.