research article
Sulfur-coated urea fertilizer for controlled release nutrition of container grown ornamentals
authors
Tokuji Furuta, Extension Ornamental Horticulturist
R. H. Sciaroni, San Mateo County
J. R. Breece, San Diego County
publication information
California Agriculture 21(9):4-5. DOI: 10.3733/ca.v021n09p4.
author affiliations
Tokuji Furuta is Extension Ornamental Horticulturist, U. C., Riverside; R. H. Sciaroni is County Director and Farm Advisor, San Mateo County; Jim Breece is Farm Advisor, San Diego County;
abstract
Nursery experiments have shown that sulfur-coated urea was excellent as a slowly available form of nitrogen for ornamental plants in containers. Best plant growth resulted when the sulfur-coated urea was incorporated in the potting mix and the plants received fertilizer applications during the growing season. Even without additional fertilization, the controlled-release urea was able to supply adequate amounts of nitrogen for several months' growth. Excessively heavy applications resulted in plant injury and death.
author notes
The fertilizers for these experiments were supplied by the Tennessee Valley Authority, Division of Chemical Development, Muscle Shoals, Alabama. The experiments reported were conducted at the Ponto Nursery, Inc., Vista, and the John E. Edwards Nursery, East Palo Alto, California.
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