About Us | Help Videos | Contact Us | Subscriptions

Agronomy Journal Abstract -

Competition for Nitrogen-15-Depleted Ammonium Nitrate between Arrowleaf Clover and Annual Ryegrass Sown into Bermudagrass Sod1


This article in AJ

  1. Vol. 78 No. 6, p. 1023-1030
    Received: Dec 20, 1985

Request Permissions

  1. D. R. Morris,
  2. R. W. Weaver,
  3. G. R. Smith and
  4. F. M. Rouquette2



Ability to compete for mineral N effects stand stability of arrowleaf clover (Trifolium vesiculosum Savi) and annual ryegrass (Lolium multiflorum Lam.). Two field experiments were conducted on a Darco soil (loamy, siliceous, thermic Grossarenic Paleudult) to investigate the competitive ability of ‘Yuchi’ arrowleaf clover and ‘Gulf’ ryegrass for uptake of 15N-depleted ammonium nitrate when seeded into dormant bermudagrass (Cynodon dactylon L. pers.). When N was applied in February, ryegrass in pure stand recovered more than two times as much fertilizer N as did clover in pure stand and more than 80% of the fertilizer N when in a mixture with clover. The April application of N resulted in the clover in pure or mixed stand recovering as much or more fertilizer N as did the corresponding ryegrass in pure or mixed stand. Growing clover in mixed stand with ryegrass increased the percentage of the N in the clover derived from N fixation by an average of 23%. Application of fertilizer N reduced the percentage of total N in the clover derived from N fixation by an average of 19%. Total N in the clover from N fixation was either unchanged or reduced when clover was grown with ryegrass and when fertilizer N was applied. Efficiency of fertilizer-N usage by either plant species ranged from a low of 5 to 70%, depending on timing of application and plant species.

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

Copyright © .