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Foliar-Applied Nitrogen for Citrus Fertilization¹

ABSTRACT

Fifty-six "experiment-years" of citrus data are presented which show that kilogram for kilogram, foliar-applied N was as effective as soil-applied N for fruit production. However, while one annual soil application sufficed to supply adequate N, three to six or more foliar sprays per year were required. "N-production efficiency" (kg fruit produced per kg applied N) varied from 97 to 484. At or near the maximum nutritionally-attainable yield, "fruit-N-removal efficiency" (kg N removed in fruit per kg applied N x 100) varied from 11 to 75%. The kg of N per 1,000 kg of fresh California citrus fruit varied from 1.15 to 1.73 and increased with increasing N rates.

Key Words: N fertilization • N efficiency • methods of N application • urea foliar sprays • citrus fruit yield

¹ Contribution from the Department of Plant Sciences, University of California, Riverside 92502.

² Professors of Horticultural Science.

Received for publication January 14, 1974.