Vol. 125 (2012): Proceedings of the Florida State Horticultural Society
Vegetable

Yield Response of Overhead Irrigated Snap Bean to Nitrogen Rates

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  • Eric Simonne,
  • Guodong Liu,
  • Aparna Gazula,
  • Bob Hochmuth,
  • Linda Landrum,
  • Debbie Gast,
  • Lei Lani Davis,
  • Wanda Laughlin,
  • Randi Randell,
  • Mace Bauer,
  • Chris Vann,
  • Carolyn Saft,
  • Elena Toro
Eric Simonne
University of Florida, IFAS, Horticultural Sciences Department, P.O. Box 110690, Gainesville, FL 32611-0690
Guodong Liu
University of Florida, IFAS, Horticultural Sciences Department, P.O. Box 110690, Gainesville, FL 32611-0690
Aparna Gazula
University of Florida, IFAS, Horticultural Sciences Department, P.O. Box 110690, Gainesville, FL 32611-0690 and University of Florida, IFAS, Alachua County Extension Service, Gainesville, FL 32609-2658
Bob Hochmuth
University of Florida, IFAS, Suwannee Valley Agricultural Extension Center, Live Oak, FL 32060-7434
Linda Landrum
University of Florida, IFAS, Suwannee Valley Agricultural Extension Center, Live Oak, FL 32060-7434
Debbie Gast
University of Florida, IFAS, Suwannee Valley Agricultural Extension Center, Live Oak, FL 32060-7434
Lei Lani Davis
University of Florida, IFAS, Suwannee Valley Agricultural Extension Center, Live Oak, FL 32060-7434
Wanda Laughlin
University of Florida, IFAS, Suwannee Valley Agricultural Extension Center, Live Oak, FL 32060-7434
Randi Randell
University of Florida, IFAS, Suwannee Valley Agricultural Extension Center, Live Oak, FL 32060-7434
Mace Bauer
University of Florida, IFAS, Columbia County Extension Service, Lake City, FL 32025
Chris Vann
University of Florida, IFAS, Lafayette County Extension Service, Mayo, FL 32066-4000
Carolyn Saft
University of Florida, IFAS, Suwannee County Extension Service, Live Oak, FL 32064-3622
Elena Toro
University of Florida, IFAS, Suwannee County Extension Service, Live Oak, FL 32064-3622

Published 2012-12-01

Keywords

  • Phaseolus vulgaris,
  • center-pivot irrigation,
  • nitrate,
  • chlorophyll,
  • SPAD

Abstract

Adequate nitrogen (N) and irrigation management are critical to optimize the yield of a shallow-rooted vegetable crop like snap bean (Phaseolus vulgarisL.). The goals of this project were to establish snap bean responses to N rates with overhead irrigation and to develop preliminary petiole sap and SPAD interpretative thresholds. The study was conducted on a Blanton–Foxworth–Alpin complex sandy soil in fall 2007 and spring 2008. ‘Bronco’ bush snap beans were fertilized with a total of 0, 40, 80, 120, 160, or 200 lb/acre (0, 45, 90, 134, 179, 224 kg/ha) N rates with three identical applications at planting, first trifoliate leaf, and first flower bud. Plots consisted of four, 40-ft (12.2-m) long rows with the two middle rows harvested. In both years, the marketable pod yield response to N rate was quadratic and maximum pod yield for both fall 2007 and spring 2008 occurred near the current recommended N rate. Preliminary data for petiole sap interpretative NO3-N thresholds were also proposed. A significant positive linear relationship between SPAD and marketable yield was observed for all growth stages in 2007, but not in 2008, thereby limiting the practicality of this measurement as an in-season monitoring tool.

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