Theses and Dissertations

Issuing Body

Mississippi State University


Varco, Jac J

Committee Member

Cox, Michael S.

Committee Member

Oldham, J. Larry

Committee Member

Irby, Jon Trenton

Date of Degree


Document Type

Graduate Thesis - Open Access


Plant and Soil Sciences

Degree Name

Master of Science


College of Agriculture and Life Sciences


Department of Plant and Soil Sciences


Iron deficiency chlorosis (IDC) is a frequent problem in soybean [Glycine max (L.) Merr.] production on calcareous soils. Greenhouse and soil incubation experiments were established to evaluate pyritic lignite efficacy to supply Fe as compared to Fe-EDDHA and Fe-EDTA sources across contrasting IDC tolerance varieties grown on a slightly acid and a calcareous soil. Soybean IDC incidence was influenced by the soil properties and variety tolerance. All iron sources increased plant dry matter accumulation on the Leeper soil, whereas on the Marietta soil only lignite at 0.672 kg ha-1 produced an increase. Lignite at 0.336 kg ha-1 successfully improved Fe availability to the plant as reflected by an increase in Fe content. Furthermore, no differences were found between the low rate of lignite and the commercial fertilizers on any of the evaluated parameters. Results from this study indicate that pyritic lignite may serve as an acceptable source of Fe on problem soils to prevent IDC.



Iron Deficiency Chlorosis||Lignite||Chelated Fertilizers||Soybean||Calcareous Soil||Soil Fertility