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The Determination and Distribution of Toxic Levels of Arsenic in a Silt Loam Soil

James T. Arnott and Albert L. Leaf
Weeds
Vol. 15, No. 2 (Apr., 1967), pp. 121-124
DOI: 10.2307/4041179
Stable URL: http://www.jstor.org/stable/4041179
Page Count: 4
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
The Determination and Distribution of Toxic Levels of Arsenic in a Silt Loam Soil
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Abstract

To evaluate the effect of different soil moisture levels on the phytotoxicity of soil applications of arsenic trioxide (As₂O₃), water and alcohol extractable soil arsenic (As) data were related to the growth and development of 4-month-old Monterey pine (Pinus radiata D. Don.) in greenhouse soil cultures. Also, various rates of As₂O₃ and water were applied to the surface of soil columns to determine the effective penetration of soluble As. Under normal moisture regime, 8000 lb/A of As₂O₃ were required for high phytotoxicity on a Chenango silt loam, with excessive moisture resulting in an increase in this phytotoxic effect. With water and alcohol extraction procedures, an adequate range of values was obtained in relation to the total As₂O₃ rates and plant responses. Lethal concentrations of As in the soil columns were limited to the surface 3 in depth in the silt loam.

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