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Registro Completo |
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Biblioteca(s): |
Embrapa Soja. |
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Data corrente: |
28/04/1993 |
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Data da última atualização: |
18/08/2004 |
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Autoria: |
HARDARSON, G.; ZAPATA, F.; DANSO, S. K. A. |
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Afiliação: |
FAO/IAEA Agricultural Biotechnology Laboratory, A-244. Seibersdorf, Austria. |
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Título: |
Effect of plant genotype and nitrogen fertilizer on symbiotic nitrogen fixation by sobyean cultivars. |
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Ano de publicação: |
1984 |
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Fonte/Imprenta: |
In: HARDARSON, G.; LIE., ed. Breeding legumes for enhanced symbiotic nitrogen fixation. Dordrecht: M.Nijhoff / W. Junk, 1984. |
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Páginas: |
p.125-133. |
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Idioma: |
Inglês |
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Conteúdo: |
Isotopic as well as non-isotopic methods were used to assess symbiotic nitrogen ixation within eight soybean (Glycine max (L.) Merrill) cultivars grown at 20 at 100 kg N/ha levels of nitrogen fertilizer under field conditions. The 15N methodology revealed large differences between soybean cultivars in their abilities to support nitrogen fixation. In almost all cases, the application of 100 kg N/ha resulted in lower N2 fixed in soybean than at 20 kg N/ha in the first year of the study. However, N2 Fixed in one cultivar, Dunadja, was not significantly affected by the higher rate of N fertilizer application. These results were confirmed by measurements of acetylene reduction activity, nodule dry weight and N2 fixed as measured by the difference method. Further proof of differences in N2 fixed within soybean cultivars and the agility of Dunadja to Fix similar amounts of N2 at 20 and 100 kg N/ha was obtained during a second year experiment. Dunadja yield was affected by N fertilizer and produced larger yield at 100 kg N/ha than at 20 kg N/ha. This type of cultivar could be particularly useful in situations where soil N levels are high or where there is need to apply high amounts of N fertilizer. The present study reveals the great variability between legume germplasms in the ability to fix N2 at different inorganic N levels, and also the potential that exists in breeding for nitrogen fixation associative tratis. The 15N methodology offers a unique tool to evaluate germplasms directly in the field for their N2 fixation abilities at different N fertilizer levels. MenosIsotopic as well as non-isotopic methods were used to assess symbiotic nitrogen ixation within eight soybean (Glycine max (L.) Merrill) cultivars grown at 20 at 100 kg N/ha levels of nitrogen fertilizer under field conditions. The 15N methodology revealed large differences between soybean cultivars in their abilities to support nitrogen fixation. In almost all cases, the application of 100 kg N/ha resulted in lower N2 fixed in soybean than at 20 kg N/ha in the first year of the study. However, N2 Fixed in one cultivar, Dunadja, was not significantly affected by the higher rate of N fertilizer application. These results were confirmed by measurements of acetylene reduction activity, nodule dry weight and N2 fixed as measured by the difference method. Further proof of differences in N2 fixed within soybean cultivars and the agility of Dunadja to Fix similar amounts of N2 at 20 and 100 kg N/ha was obtained during a second year experiment. Dunadja yield was affected by N fertilizer and produced larger yield at 100 kg N/ha than at 20 kg N/ha. This type of cultivar could be particularly useful in situations where soil N levels are high or where there is need to apply high amounts of N fertilizer. The present study reveals the great variability between legume germplasms in the ability to fix N2 at different inorganic N levels, and also the potential that exists in breeding for nitrogen fixation associative tratis. The 15N methodology offers a unique tool to evaluate germplasms dire... Mostrar Tudo |
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Palavras-Chave: |
Plant; Reducao acetileno; Soybean. |
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Thesagro: |
Fixação de Nitrogênio; Glycine Max; Planta; Rhizobium Japonicum; Soja. |
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Thesaurus Nal: |
acetylene reduction; nitrogen fixation. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02417naa a2200277 a 4500
001 1452977
005 2004-08-18
008 1984 bl uuuu u00u1 u #d
100 1 $aHARDARSON, G.
245 $aEffect of plant genotype and nitrogen fertilizer on symbiotic nitrogen fixation by sobyean cultivars.
260 $c1984
300 $ap.125-133.
520 $aIsotopic as well as non-isotopic methods were used to assess symbiotic nitrogen ixation within eight soybean (Glycine max (L.) Merrill) cultivars grown at 20 at 100 kg N/ha levels of nitrogen fertilizer under field conditions. The 15N methodology revealed large differences between soybean cultivars in their abilities to support nitrogen fixation. In almost all cases, the application of 100 kg N/ha resulted in lower N2 fixed in soybean than at 20 kg N/ha in the first year of the study. However, N2 Fixed in one cultivar, Dunadja, was not significantly affected by the higher rate of N fertilizer application. These results were confirmed by measurements of acetylene reduction activity, nodule dry weight and N2 fixed as measured by the difference method. Further proof of differences in N2 fixed within soybean cultivars and the agility of Dunadja to Fix similar amounts of N2 at 20 and 100 kg N/ha was obtained during a second year experiment. Dunadja yield was affected by N fertilizer and produced larger yield at 100 kg N/ha than at 20 kg N/ha. This type of cultivar could be particularly useful in situations where soil N levels are high or where there is need to apply high amounts of N fertilizer. The present study reveals the great variability between legume germplasms in the ability to fix N2 at different inorganic N levels, and also the potential that exists in breeding for nitrogen fixation associative tratis. The 15N methodology offers a unique tool to evaluate germplasms directly in the field for their N2 fixation abilities at different N fertilizer levels.
650 $aacetylene reduction
650 $anitrogen fixation
650 $aFixação de Nitrogênio
650 $aGlycine Max
650 $aPlanta
650 $aRhizobium Japonicum
650 $aSoja
653 $aPlant
653 $aReducao acetileno
653 $aSoybean
700 1 $aZAPATA, F.
700 1 $aDANSO, S. K. A.
773 $tIn: HARDARSON, G.; LIE., ed. Breeding legumes for enhanced symbiotic nitrogen fixation. Dordrecht: M.Nijhoff / W. Junk, 1984.
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Embrapa Soja (CNPSO) |
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