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Foliar‐Applied Nitrogen for Citrus Fertilization
Author(s) -
Embleton T. W.,
Jones W. W.
Publication year - 1974
Publication title -
journal of environmental quality
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.888
H-Index - 171
eISSN - 1537-2537
pISSN - 0047-2425
DOI - 10.2134/jeq1974.00472425000300040019x
Subject(s) - human fertilization , citrus fruit , nitrogen , horticulture , zoology , yield (engineering) , potassium , agronomy , nitrogen fertilizer , chemistry , biology , fertilizer , materials science , organic chemistry , metallurgy
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 × 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.