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.
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.
Winston W. Jones is Associate Horticulturist in the Experiment Station, Riverside. E. R. Parker is Horticulturist in the Experiment Station, Riverside.