Management of Zinc and Phosphorus for Corn in a Calcareous Red River Alluvial Soil. (S04-harrell755743-oral)
Authors:
D.L. Harrell* - Louisiana State University
J.J. Wang - Louisiana State University Agricultural Center S. Moore - Louisiana State University Agricultural Center M. Wolcott - Louisiana State University Agricultural Center
Abstract:
Zinc (Zn) deficient soils, as determined by the DTPA-TEA soil test extraction, can cause reduced agronomic yields and thus profits if not corrected early in the growing season. A field study was
established with corn on a Norwood silt loam (Fine-silty, mixed, calcareous, superactive, hyperthermic Fluventic Eutrudepts) to investigate Zn fertilization at different P levels. The experimental design was a randomized block consisting of four blocks (replications), six P rates (0, 15, 30, 45, 60, 160 kg P per ha), and six Zn rates (0, 1.1, 2.2, 3.4, 4.5, 6.7 kg Zn per ha). The P was applied as triple super phosphate and the Zn was applied as zinc sulfate. Zinc application increased corn yield significantly.
Phosphorus level in corn leaves was decreased by Zn fertilization. The interaction between Zn and P fertilizations and the predictability of soil tests will be presented.
Speaker Information: Dustin Harrell, Louisiana State University, Department of Agronomy Louisiana State University, Baton Rouge, LA 70803; Phone: 225-578-1360; E-mail: [email protected]
Session Information: Tuesday, November 4, 2003, 2:55 PM-5:30 PM Presentation Start: 3:45 PM
Keywords: Zinc and Phosphorus interaction; Zn deficiency; soil test; calcareous soil