Work

A Comparison of Nitrogen Sources and Rates on Old, High-Yielding Valencia Orange Trees in Florida1

Year: 1970

Type: article

Abstract: Sodium, calcium, and ammonium nitrates were compared as N sources on old ‘Valencia’ orange trees in Florida. Annual rates of 100, 200, 250, 300, and 400 lb. N per acre were supplied in a complete random block experiment. Sodium nitrate was not satisfactory because of thinness of foliage and reduced yields. With the other 2 sources, yields increased throughout the range of rates, although the largest increment of increase was between the 100 and 200-lb. rates. Moderate deficiency existed at the 100-lb. rate with all sources, but the trees were never yellow. The most prominent symptom of inadequate N was thinness of foliage from premature leaf abscission. Three-month-old leaves were a better index of N status and tree response than 5-, 8-, or 11-month-old leaves.

Source: Journal of the American Society for Horticultural Science

DOI: 10.21273/jashs.95.1.15

Author: Paul F. Smith

Institutions: Agricultural Research Service, United States Department of Agriculture

Language: English

Topic: Plant Physiology and Cultivation Studies

Subfield: Plant Science

Field: Agricultural and Biological Sciences

Domain: Life Sciences

SDG: Zero hunger

Open Access status: hybrid

Estimated APC paid: $3,500