Full TGIF Record # 18384
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Publication Type:
Author(s):Mallarino, A. P.; Wedin, W. F.
Author Affiliation:Agronomy Department, Iowa State University
Title:Seasonal distribution of topsoil ammonium and nitrate under legume-grass and grass swards
Source:Plant and Soil. Vol. 124, No. 1, May 1990, p. 137-140.
Publishing Information:Dordrecht, Netherland: Kluwer Academic Publishers
Related Web URL:http://link.springer.com/article/10.1007/BF00010941
    Last checked: 10/14/2015
    Notes: Abstract only
Keywords:TIC Keywords: Trifolium repens; Trifolium pratense; Lotus corniculatus; Festuca arundinacea; Nitrates; Ammonia; Topsoil
Abstract/Contents:"Losses of soil N through leaching and N2 fixation by legumes often are related to soil nitrate concentration. The seasonal distribution of soil ammonium and nitrate concentrations under ungrazed legume-grass and grass swards were evaluated on two experiments that were established in 1983 (Exp. 1) and in 1984 (Exp. 2). Treatments were white clover (Trifolium repens L.), red clover (Trifolium pratense L>), and birdsfoot trefoil (Lotus corniculatus L.), each grown with tall fescue (Festuca arundicacea Schreb.) at two legume proportions, and a pure stand of TF. The concentrations of both forms of N were measured in the top 20-cm layer during 2 years in Exp. 1 and for 1 year in Exp. 2. The concentrations of nitrate and ammonium were least in winter and spring, and greatest in summer. The concentration of nitrate for the mixtures decreased in the order WC-TF, RC-TF, and BT-TF in both summers of Exp. 1 but there were no mixture differences in Exp. 2. The concentration of soil nitrate usually was small for these swards but became greater and often dependent on species and legume proportion during summer. The concentration of soil ammonium also was greater in summer but was not affected by species or legume proportion."
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Mallarino, A. P., and W. F. Wedin. 1990. Seasonal distribution of topsoil ammonium and nitrate under legume-grass and grass swards. Plant Soil. 124(1):p. 137-140.
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