Indigenous soil properties influencing the availability of Fe in calcareous hot spots

Loeppert, R.H. and Hossner, L.R. and Chmielewski, M.A. (1984) Indigenous soil properties influencing the availability of Fe in calcareous hot spots. Journal of Plant Nutrition, 7 (1-5). pp. 135-145.

[img] PDF - Published Version
Restricted to ICRISAT researchers only

Abstract

Iron deficiency associated with sorghum or soybean is frequently observed as a localized chlorosis of variable extent and severity, commonly referred to as a “hot spot”;, within the field. In this study, 31 paired soil samples representing the chlorotic and adjacent non‐chlorotic areas from three major geographic regions of Texas were taken and examined with respect to the carbonate, organic matter and iron oxide phases, along with particle size distribution, pH, alkalinity, and extractable P. A greenhouse study was conducted and 3‐week old sorghum seedlings were visually evaluated and chemically analyzed for Fe uptake. Statistical analyses showed different parameters to be related to chlorosis in the three geographic regions. In the coastal bend area of Texas the majority of hot spot soils were associated with localized areas of CaCO3‐rich surface horizons surrounded by soils which had generally non‐calcareous surface horizons. Amorphous Fe oxide content was negatively correlated with the incidence of Fe chlorosis on soils containing significant concentrations of CaCO3. Also, the paired t‐test showed significantly higher clay contents and organic matter contents for adjacent soils compared to hot spot soils. The influence of clay and organic matter may have been indirect since these phases may tend to stabilize a poorly crystalline Fe oxide which is more readily available to plants.

Item Type: Article
Author Affiliation: Department of Soil and Crop Science, Texas A&M University
Subjects: Soil Science and Microbiology > Soil Sciences
Divisions: Sorghum
Depositing User: Library ICRISAT-InfoSAT
Date Deposited: 17 Mar 2012 09:09
Last Modified: 17 Mar 2012 09:09
Official URL: http://dx.doi.org/10.1080/01904168409363181
URI: http://eprints.icrisat.ac.in/id/eprint/3909

Actions (login required)

View Item View Item
EPrints Logo
eprints is powered by EPrints 3 which is developed by the School of Electronics and Computer Science at the University of Southampton. More information and software credits.