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Distribution and Plant Availability of Soil Boron Fractions
Author(s) -
Jin Jinyun,
Martens D. C.,
Zelazny L. W.
Publication year - 1987
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/sssaj1987.03615995005100050025x
Subject(s) - chemistry , fractionation , soil water , ammonium oxalate , oxalate , boron , ammonium , adsorption , environmental chemistry , mannitol , nuclear chemistry , chromatography , inorganic chemistry , biochemistry , organic chemistry , environmental science , soil science
The fractionation of soil B and the plant availability of each fraction have not been examined extensively. This laboratory and greenhouse research was conducted to study the distribution and plant availability of B in different soil fractions. Total B in the 14 soils under study ranged from 21.5 to 96.3 mg kg −1 . A trace to 0.34% of the total B was in a water‐soluble form; ≤0.23% was 0.02 M CaCl 2 extractable (nonspecifically adsorbed B); from 0.05 to 0.30% was mannitol exchangeable (specifically adsorbed B); and from 0.23 to 1.52% was acidified NH 2 OH·HCl extractable (B occluded in Mn oxyhydroxides). Ammonium oxalate solution (pH 3.25) extracted from 2.8 to 34.4% of the total soil B in the dark (B occluded in noncrystalline Al and Fe oxyhydroxides) and from 17.5 to 73.9% under ultraviolet (UV) light (B occluded in crystalline Al and Fe oxyhydroxides). Residue B, which was considered to be in association with soil silicates, accounted for 2.4 to 79.2% of the total B. Boron concentration in corn ( Zea mays L.) tissue correlated positively (α = ≤0.05) with water‐soluble B, CaCl 2 extractable B, mannitol exchangeable B, and acidified NH 2 OH·HCl extractable B. The sum of these four fractions, which were related to B availability, accounted for only 0.4 to 2.0% of the total B in the 14 soils. Boron concentration in corn tissue was unrelated (α = 0.05) to NH 4 ‐oxalate extractable B (either in the dark or under UV light) and to the residue B fraction. These relationships indicate that B in noncrystalline and crystalline Al and Fe oxyhydroxides and in silicates was relatively unavailable for plant uptake.