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

Abstract

 

This article in AJ

  1. Vol. 82 No. 1, p. 21-26
     
    Received: Dec 16, 1988
    Published: Jan, 1990


    * Corresponding author(s):
 View
 Download
 Alerts
 Permissions
 Share

doi:10.2134/agronj1990.00021962008200010005x

Warm-Season Grass Diversity in Yield, Plant Morphology, and Nitrogen Concentration and Removal in Northeastern USA

  1. G. A. Jung ,
  2. J. A. Shaffer,
  3. W. L. Stout and
  4. M. T. Panciera
  1. School of Agriculture and Land Resources Management, Univ. of Alaska, Palmer, AK 99645

Abstract

Abstract

Six genera of warm-season grasses were grown in Pennsylvania for 9 yr on a fine-loamy, mixed mesic, Aquic Fragiudult, to determine their potential as forage grasses on droughty sites. Effects of applied N on yield, plant morphology, and N composition of forages were studied during Years 4 through 7, when N was applied to half of each plot area. Big bluestem, Andropogon gerardii Vitman, and switchgrass, Panicum virgatum L., showed much cultivar variation in stand development, whereas asiatic bluestem, Bothriochloa spp., and indiangrass, Sorghastrum nutans (L.) Nash, developed productive stands in one season. Mean yield of ‘NJ SO’ switchgrass was higher than that of all other grasses, yield of ‘Niagara’ big bluestem was higher than that of other big bluestems, and yield of ‘Ky 591’ indiangrass was higher than that of other indiangrasses. The percentage of grasses showing a yield response to applied N increased each year, from 32% in 1981 to 67% in 1984. Mean yield response to N varied greatly among cultivars, P < 0.001. Nitrogen concentration in forage varied among bluestems and indiangrasses, but not among switchgrasses. Mean N removed in first-harvest forage ranged from 16 kg ha−1 yr−1 for untreated ‘Plains’ asiatic bluestem to 97 kg ha−1 yr−1 for N-treated NJ 50 switchgrass. Flowerstem density and height were affected differently by N, depending upon plant species and cultivar. The sheath-stem component of dry matter yield was 60 g kg−1 higher when N was applied than when no N was applied. In the ninth year, approximately one-half of the cultivars had stand ratings exceeding 80% ground cover.

Contribution no. 8805 of the U.S. Regional Pasture Research Lab. This article reports the results of research only. Mention of a proprietary product does not constitute an endorsement or a recommendation for its use by USDA.

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

Copyright © .