My Account: Log In | Join | Renew
Search
Author
Title
Vol.
Issue
Year
1st Page

Abstract

 

This article in AJ

  1. Vol. 99 No. 3, p. 707-714
     
    Received: July 7, 2006
    Published: May, 2007


    * Corresponding author(s): mlas@ufl.edu
 View
 Download
 Alerts
 Permissions

doi:10.2134/agronj2006.0200

Response of Coastal Bermudagrass Yield and Nutrient Uptake Efficiency to Nitrogen Sources

  1. Maria L. Silveira *a,
  2. Vincent A. Habyb and
  3. Allen T. Leonardb
  1. a Univ. of Florida, Range Cattle Research and Education Center, 3401 Experiment Station, Ona, FL 33865
    b Texas Agricultural Experiment Station, Texas A&M Univ. System, P.O. Box 200, Overton, TX 75684-0200

Abstract

Nitrogen is an important agronomic input for bermudagrass production in the southern USA. Fertilizers that can efficiently provide N to grass pastures and hay meadows are an important issue because of increasing costs and environmental problems associated with N losses. This experiment was designed to determine the effectiveness of various N sources on ‘Coastal’ bermudagrass [Cynodon dactylon (L.) Pers.] production and N uptake efficiency. Nitrogen was applied at 0, 45, 90, and 135 kg ha−1 harvest−1 as urea–ammonium nitrate (UAN), urea, ammonium nitrate (AN) and ammonium sulfate (AS) on Gallime (Glossic Paleudalf) and Lilbert (Plinthic Paleudult) soils. Mixtures of S with UAN and of Ca and B with urea were also evaluated. Bermudagrass was periodically harvested and subsampled for total N analysis. At termination of the study soil samples were collected for pH and extractable NO3–N analyses. Bermudagrass yield responses to N sources were significant only in the Gallime soil. In this soil, AN and AS increased yields and resulted in greater N uptake compared to urea and UAN. Lilbert soil showed no effect of N sources on dry matter (DM) production. There was a yield response to N rates and maximum bermudagrass production was generally achieved at the 90 kg ha−1 N rate regrowth−1 Fertilizer efficiency declined as the N rate was increased. Soil acidity increased in response to N application, particularly for the AS treatments. Selection of N sources and rates should be carefully planned to avoid detrimental effects on soil acidity and, consequently, fertilizer efficiency.

  Please view the pdf by using the Full Text (PDF) link under 'View' to the left.

Copyright © 2007. American Society of AgronomyAmerican Society of Agronomy

Facebook   Twitter