relation: http://oar.icrisat.org/4451/
title: Nitrogen accumulation in three legumes and two cereals  with emphasis on estimation of N2 fixation in the legumes  by the natural15 N-abundance technique
creator: Yoneyama, T
creator: Nambiar, P T C
creator: Lee, K K
creator: Srinivasa Rao, B
creator: Williams, J H
subject: Groundnut
subject: Sorghum
subject: Food Legumes
description: N accumulation and natural "N ahundance  in three legumes (groundnuts, cowpeas, and  soybeans) and in two cereals (sorghum and maize)  were investigated over two seasons in Alfisols with and  without N fertilization. Using the N uptake and natural  "N abundance of non-nodulating plants as the indication  of N derived from soil and fertilizer, the per  cent N derived from atmospheric N2 was calculated  for nodulated plants. In the first experiment, the  groundnut genotype contained 85% atmospherc-derived  N, but the percentage decreased with N application,  Estimates of atmosphere-derived N by the N-difference  and 15~-abundanctee chniques gave identical  results. The percentages of atmosphere-derived N estimated  by the two methods at different stages of  groundnut growth were also similar. In the second experiment,  atmosphere-derived N was estimated in  plants grown with 0-200 kg ha-' applied N. The estimated  atmosphere-derived N ranged from 42% to  61 % for groundnuts from 33% to 77% for cowpeas,  and from 24% to 48% for soybeans, depending on the  amount of N applied. Inoculation with a Bradyrhizobium  strain increased the percentage of atmospherederived  N in soybean plants grown without any fertilizer  N. The natural "N abundance of sorghum and  maize was very close to that of the non-nodulating  groundnut, suggesting that these cereals can be used as  reference plants in the estimation of atmosphere-derived  N by the natural "N-abundance method.
publisher: Springer Verlag
date: 1990
type: Article
type: PeerReviewed
format: application/pdf
language: en
identifier: http://oar.icrisat.org/4451/1/876.pdf
identifier:   Yoneyama, T and Nambiar, P T C and Lee, K K and Srinivasa Rao, B and Williams, J H  (1990) Nitrogen accumulation in three legumes and two cereals with emphasis on estimation of N2 fixation in the legumes by the natural15 N-abundance technique.  Biology and Fertility of Soils, 9 (1).  pp. 25-30.  ISSN 0178-2762     
relation: http://dx.doi.org/10.1007/BF00335857