HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by Coulombe, B. A. Articles by Wiebold, W. J. Search for Related Content PubMed Articles by Coulombe, B. A. Articles by Wiebold, W. J. Agricola Articles by Coulombe, B. A. Articles by Wiebold, W. J.

Bicarbonate Directly Induces Iron Chlorosis in Susceptible Soybean Cultivars¹

ABSTRACT

Four soybean [Glycine max (L.) Merr.] cultivars differing in susceptibility to iron (Fe) chlorosis in wet calcareous soils were grown in nutrient solutions to characterize the effects of phosphate (P) and bicarbonate (HCO^-₃) in inducing chlorosis. NaHCO₃ (0 or 10 mM), P (10 or 400 µM as NaH₂PO₄, and NH⁺₄ (0 or 300 µM) as (NH₄)₂SO₄ were factorial treatments in a nutrient solution. Low Fe availability was maintained by supplying 5 µM Fe + 10 µM EDDHA, and excess CaCO₃(pH 7.5). With no HCO^-₃ added, ‘T203’ (extremely chlorosis susceptible) was green at 10 µM P, but severely chlorotic at 400 µM P; ‘Wayne’ (chlorosis susceptible) was green at both P levels. Addition of HCO^-₃ caused chlorosis in T203 and Wayne at 10 or 400 µM P. Chlorosis resistant ‘AP9’ and ‘Hawkeye’ remained green with added P or HCO^-₃. Chlorosis ratings (1 = green to 5 = severely chlorotic) in the 0 HCO^-₃ + 10 µM P, 0 HCO^-₃ + 400 µM P and 10 HCO^-₃ + 400 µM P treatments, respectively, were: 1.0, 1.0, and 1.5 for AP9; 1.0, 1.0, and 1.4 for Hawkeye; 1.0, 1.2, and 3.9 for Wayne; and 1.0, 4.2, and 4.6 for T203. Low Fe concentrations in young leaves corresponded with high chlorosis ratings. Phosphorus concentration in young leaves did not change with HCO^-₃ at 10 µM P, but decreased with HCO^-₃ at 400 µM P. In the absence of HCO^-₃, Wayne was not chlorotic at either concentration of solution P, although this cultivar is known to be highly susceptible to chlorosis in the field. Bicarbonate-induced chlorosis in Wayne was not a result of increased solubility or plant uptake of P. Thus, HCO^-₃ was a direct factor in causing soybean chlorosis, and likely is also a cause in soils.

¹ Contribution no. A-3762 Scientific article no. 6739 of the Maryland Agric. Exp. Stn., Dep. of Agronomy, College Park, MD 20742 and USDA-ARS, Beltsville, MD 20705; presented before Div. S-4, 2 Dec. 1982, Anaheim, CA. This article is from a thesis to be submitted to the Graduate School, Univ. of Maryland, by B. A. Coulombe in partial fulfillment of the requirements for the Master's Degree in Agronomy.

² Graduate Research Assistant, Dep. of Agronomy, Univ. of Maryland, College Park, MD 20742; Research Agronomist, USDA-ARS, Biological Waste Management & Organic Resources Lab., BARC, Beltsville, MD 20705; and former Assistant Professor, Univ. of Maryland, presently Assistant Professor, Dep. of Agronomy, Ohio State Univ., Columbus, OH 43210, respectively.

Received for publication January 23, 1984. Accepted for publication May 21, 1984.

This article has been cited by other articles:

				N. P. Rogovska, A. M. Blackmer, and A. P. Mallarino Relationships between Soybean Yield, Soil pH, and Soil Carbonate Concentration Soil Sci. Soc. Am. J., June 8, 2007; 71(4): 1251 - 1256. [Abstract] [Full Text] [PDF]

				S. L. Naeve and G. W. Rehm Genotype x Environment Interactions within Iron Deficiency Chlorosis-Tolerant Soybean Genotypes Agron. J., May 3, 2006; 98(3): 808 - 814. [Abstract] [Full Text] [PDF]

				N. C. Hansen, M. A. Schmitt, J. E. Anderson, and J. S. Strock Iron Deficiency of Soybean in the Upper Midwest and Associated Soil Properties Agron. J., November 1, 2003; 95(6): 1595 - 1601. [Abstract] [Full Text] [PDF]