Theses and Dissertations

Issuing Body

Mississippi State University


Henrym, W. Brien

Committee Member

Fox, Amy Ann Amelia

Committee Member

Larson, Erick J.

Committee Member

Varco, Jac J.

Date of Degree


Document Type

Graduate Thesis - Open Access


Plant and Soil Sciences (Agronomy)

Degree Name

Master of Science


College of Agriculture and Life Sciences


Department of Plant and Soil Sciences


A review of available corn relative maturity groups in Mississippi shows a limited range of maturity groups in use. Research focusing on expanding the range of maturity groups was conducted in MS in 2015 and 2016. Along with expanded maturity groups, treatments of fertilizer (10-34-0), foliar zinc, and a plant hormone blend were studied to shorten the growing season. Four site years in MS were studied to determine optimal plant maturity group and treatment for length of season. The results showed decreased yield of 0.09-0.15 Mg ha-1 (1.5-2.3 bu ac-1) for each day of decreasing relative maturity in three of four site years. The addition of starter fertilizer increased vegetative growth stage, plant height V5 and V7, SPAD values at V5, and significantly decreases days to tassel and silking reproductive growth stages but did not affect yield.