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Nitrogen accumulation in three legumes and two cereals with emphasis on estimation of N2 fixation in the legumes by the natural15 N-abundance technique

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Relation http://oar.icrisat.org/4451/
http://dx.doi.org/10.1007/BF00335857
 
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
Nambiar, P T C
Lee, K K
Srinivasa Rao, B
Williams, J H
 
Subject Groundnut
Sorghum
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
PeerReviewed
 
Format application/pdf
 
Language en
 
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Identifier http://oar.icrisat.org/4451/1/876.pdf
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