Nitrogen for orange trees: Experiments on the use of urea applied to the foliage as a source of nitrogen now under study
Winston W. Jones
E. R. Parker
California Agriculture 3(10):13-13. DOI: 10.3733/ca.v003n10p13.
Winston W. Jones is Associate Horticulturist in the Experiment Station, Riverside. E. R. Parker is Horticulturist in the Experiment Station, Riverside.
Not available – first paragraph follows:
Urea sprays designed to supply nitrogen to the foliage of orange trees are being tested at the Citrus Experiment Station in Riverside.