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Boron Toxicity in Red Pine Following Municipal Waste Water Irrigation
Author(s) -
Neary Daniel G.,
Schneider G.,
White D. P.
Publication year - 1975
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1975.03615995003900050047x
Subject(s) - boron , irrigation , humus , fertilizer , borax , chemistry , agronomy , zoology , environmental science , soil water , biology , soil science , raw material , organic chemistry
Foliar boron toxicity symptoms, a needle tip necrosis and discoloration, appeared in a 20‐year‐old red pine plantation ( Pinus resinosa Ait) after two growing seasons (a total of 34 weeks) of spray irrigation with municipal waste water. Irrigation rates of 25, 50, and 88 mm/week produced significant increases in the boron contents of current foliage, forest humus, and mineral soil. Foliage, humus and upper 15 cm of mineral soil of the unirrigated plots contained 22 ppm, 16 ppm, and 1 kg/ha of boron, respectively. The high irrigation rate increased boron levels to 75 ppm, 90 ppm, and 4 kg/ha, respectively. Despite low boron concentrations (1 ppm) in the waste water, total boron loadings were equivalent to applications of 67.3, 135.7, and 230.1 kg/ha of borax fertilizer (11.3% B).