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Published in J Environ Qual 1:317-320 (1972)
© 1972 American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Arsenic Toxicity to Cotton and Soybeans1

Lloyd E. Deuel and Alien R. Swoboda2

ABSTRACT

Arsenic toxicity levels for ‘Lankert’ cotton (Gossypium hirsutum L.) and ‘Patterson’ soybeans (Glycine max L. merr.) were determined in a green house experiment using an Amarillo fine sandy loam and a Houston Black clay. The treatments ranged from 28 to 280 kg As/ha in the Amarillo soil and from 56 to 560 kg As/ha in the Houston Black soil. The vegetative cotton yields were significantly decreased below the checks at the 56 and 280 kg/ha rates of applied As in the Amarillo and Houston Black soils, respectively. Soybeans were found to be more sensitive to As than cotton. Vegetative soybean yields were significantly decreased at the applied rates of 28 kg As/ha in the Amarillo soil and 168 kg As/ha in the Houston Black soil. Yield limiting As concentrations in plant tissue were 4.4 ppm and greater in cotton, and 1 ppm and greater in soybeans. Water soluble As levels of 8 ppm in the Amarillo soil and 28 ppm in the Houston Black soil were required for a significant decrease in the vegetative growth of cotton. The water soluble As levels detrimental to soybeans were 3 and 12 ppm in the Amarillo and Houston Black soils, respectively.

Key Words: soluble arsenic • arsenic extraction • arsenic toxicity • cotton • soybeans

NOTES

1 Contribution from the Soil and Crop Sciences Dep., Texas A&M Univ., College Station. 77843.

2 Graduate Assistant and Associate Professor, Soiland Crop Sciences Dep.

Received for publication September 18, 1971.




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Copyright © 1972 by the American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America.