TY - JOUR AU - Jones, Winston W. AU - Parker, E. R. TI - Nitrogen for orange trees: Experiments on the use of urea applied to the foliage as a source of nitrogen now under study JF - California Agriculture JO - Calif Agr Y1 - 1949/10/01 VL - 3 IS - 10 SP - 13 EP - 13 PB - University of California Agriculture and Nature Resources SN - 0008-0845 UR - http://www.ucanr.edu/sites/calagjournal/archive/?article=ca.v003n10p13 AB - Urea sprays designed to supply nitrogen to the foliage of orange trees are being tested at the Citrus Experiment Station in Riverside.