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Published in Soil Sci Soc Am J 36:621-624 (1972)
© 1972 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Field Calibration of Soil Tests for Available Zinc1

M. M. Alley, D. C. Martens, M. G. Schnappinger, Jr. and G. W. Hawkins2

ABSTRACT

Laboratory tests were calibrated for detection of soils supplying inadequate Zn for normal growth of corn plants (Zea mays L.). The available Zn tests under investigation were based on amounts of Zn extracted by 0.1 N HCl, dilute HCl-H2SO4, ethylenediaminetetraacetic acid (EDTA), and diethylenetriaminepentaacetic acid (DTPA). The EDTA procedure gave the best separation of soils supplying either adequate or inadequate Zn for corn plants grown in the field. The "critical" level of EDTA-extractable Zn for the 10 soils under study was approximately 0.8 ppm. Soils also were separated into Zn deficient and Zn sufficient categories by a three variable equation, Y = 780.2 + 68.8X1 – 101.3X2 – 0.4X3; where Y = Zn availability index, X1 = ppm dilute HCl-H2SO4 extractable Zn, X2 = soil pH, and X3 = ppm dilute HCl-H2SO4 extractable P. A Zn availability index of 135 gave the separation.

NOTES

Contribution from the Agronomy Department, Virginia Polytechnic Institute and State University, Blacksburg 24061. Financial support from Geigy Agricultural Chemicals, Division of CIBA-GEIGY Corporation; Smith-Douglass, Division of Borden Chemical, Borden, Inc.; and US Borax and Chemical Corporation is gratefully acknowledged.

2 Graduate Assistant, Associate Professor of Agronomy, former Graduate Assistant (now Research Representative, Geigy Agricultural Chemicals), and Professor of Agronomy, respectively.

Received for publication December 10, 1971. Accepted for publication February 8, 1972.






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Copyright © 1972 by the Soil Science Society of America.