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Registro Completo |
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Biblioteca(s): |
Embrapa Cerrados. |
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Data corrente: |
03/11/1992 |
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Data da última atualização: |
22/10/1999 |
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Autoria: |
BOWEN, W. T. |
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Título: |
Estimating the nitrogen contribution of legumes to succeeding maize on an oxisol in Brazil. |
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Ano de publicação: |
1987 |
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Fonte/Imprenta: |
Ithaca: Cornell University, 1987. |
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Páginas: |
178p. |
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Idioma: |
Inglês |
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Notas: |
Ph.D. Thesis. |
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Conteúdo: |
Legumes managed as green manures may supply all or most of the nitrogen needed by succeeding nonlegume crops for maximum production. To find legumes and management systems most efficient at supplying this nitrogen requires extensive testing of many potential legumes and management systems. As an alternative to extensive crop response studies, a field screening procedure was proposed whereby the supplying capacity of different legumes may be estimated from the amount of inorganic nitrogen released in bare fallow soil following their incorporation. To test the screening procedure, an irrigated dry season experiment was conducted on a Typic Acrustox in Cerrado Region of central Brazil to determine if the quantity of inorganic nitrogen accumulated in fallow soil was proportional to nitrogen uptake by maize (Zea mays L.). After the incorporation of varying amounts of plant material derived from two legumes, mucuna [Mucuna aterrima (Piper & Tracy) Merr.] and soybean [Glycine max (L.) Merr.], inorganic nitrogen that accumulated in fallow soil was measured periodically until maize harvest. Results showed the quantity of inorganic nitrogen accumulated in fallow soil was significantly proportional to nitrogen uptake by maize (r=0.93, p=0.01). the accumulation of inorganic nitrogen in fallow soil and nitrogen uptake by maize were also measured in two separate experiments conducted during the subsequent wet season. Data from these two experiments were combined with the dry season data to reveal a significantly proportional relationship between the quantity of inoganic nitrogen accumulated in fallow soil and nitrogen uptake by maize across all three experiments (r=0.92, p=0.01). Linear regression of the data showed that maize took up 44% (+-6.0%) of the inoganic nitrogen released in fallow soil by 72 to 83 days after planting. Comparisons could not be determined for later dates because mineralized nitrogen was evetually leached during the wet season below the sampling and rooting depth. It was also demonstrated across the three experiments that 81% (+-5.4%) of the inorganic nitrogen released in fallow soil was recovered in aboveground maize plus residual soil inorganic nitrogem (r=0,98,p=0.01). Therefore, the nitrogen suppling potential of legumes may be appropriately estimated by the quantity of inorganic nitrogen relased in bare fallow soil after bincorporation. MenosLegumes managed as green manures may supply all or most of the nitrogen needed by succeeding nonlegume crops for maximum production. To find legumes and management systems most efficient at supplying this nitrogen requires extensive testing of many potential legumes and management systems. As an alternative to extensive crop response studies, a field screening procedure was proposed whereby the supplying capacity of different legumes may be estimated from the amount of inorganic nitrogen released in bare fallow soil following their incorporation. To test the screening procedure, an irrigated dry season experiment was conducted on a Typic Acrustox in Cerrado Region of central Brazil to determine if the quantity of inorganic nitrogen accumulated in fallow soil was proportional to nitrogen uptake by maize (Zea mays L.). After the incorporation of varying amounts of plant material derived from two legumes, mucuna [Mucuna aterrima (Piper & Tracy) Merr.] and soybean [Glycine max (L.) Merr.], inorganic nitrogen that accumulated in fallow soil was measured periodically until maize harvest. Results showed the quantity of inorganic nitrogen accumulated in fallow soil was significantly proportional to nitrogen uptake by maize (r=0.93, p=0.01). the accumulation of inorganic nitrogen in fallow soil and nitrogen uptake by maize were also measured in two separate experiments conducted during the subsequent wet season. Data from these two experiments were combined with the dry season data t... Mostrar Tudo |
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Palavras-Chave: |
Brasil; Ferrasols; Maize; Mucuma aterrima: Soja; Mucuna aterrima. |
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Thesagro: |
Adubo Verde; Cerrado; Glycine Max; Leguminosa; Milho; Mucuna; Nitrogênio; Oxisol; Soja; Zea Mays. |
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Thesaurus Nal: |
Brazil; Ferralsols; green manures; legumes; nitrogen; soybeans. |
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Categoria do assunto: |
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Marc: |
LEADER 03314nam a2200385 a 4500
001 1559223
005 1999-10-22
008 1987 bl uuuu m 00u1 u #d
100 1 $aBOWEN, W. T.
245 $aEstimating the nitrogen contribution of legumes to succeeding maize on an oxisol in Brazil.
260 $aIthaca: Cornell University$c1987
300 $a178p.
500 $aPh.D. Thesis.
520 $aLegumes managed as green manures may supply all or most of the nitrogen needed by succeeding nonlegume crops for maximum production. To find legumes and management systems most efficient at supplying this nitrogen requires extensive testing of many potential legumes and management systems. As an alternative to extensive crop response studies, a field screening procedure was proposed whereby the supplying capacity of different legumes may be estimated from the amount of inorganic nitrogen released in bare fallow soil following their incorporation. To test the screening procedure, an irrigated dry season experiment was conducted on a Typic Acrustox in Cerrado Region of central Brazil to determine if the quantity of inorganic nitrogen accumulated in fallow soil was proportional to nitrogen uptake by maize (Zea mays L.). After the incorporation of varying amounts of plant material derived from two legumes, mucuna [Mucuna aterrima (Piper & Tracy) Merr.] and soybean [Glycine max (L.) Merr.], inorganic nitrogen that accumulated in fallow soil was measured periodically until maize harvest. Results showed the quantity of inorganic nitrogen accumulated in fallow soil was significantly proportional to nitrogen uptake by maize (r=0.93, p=0.01). the accumulation of inorganic nitrogen in fallow soil and nitrogen uptake by maize were also measured in two separate experiments conducted during the subsequent wet season. Data from these two experiments were combined with the dry season data to reveal a significantly proportional relationship between the quantity of inoganic nitrogen accumulated in fallow soil and nitrogen uptake by maize across all three experiments (r=0.92, p=0.01). Linear regression of the data showed that maize took up 44% (+-6.0%) of the inoganic nitrogen released in fallow soil by 72 to 83 days after planting. Comparisons could not be determined for later dates because mineralized nitrogen was evetually leached during the wet season below the sampling and rooting depth. It was also demonstrated across the three experiments that 81% (+-5.4%) of the inorganic nitrogen released in fallow soil was recovered in aboveground maize plus residual soil inorganic nitrogem (r=0,98,p=0.01). Therefore, the nitrogen suppling potential of legumes may be appropriately estimated by the quantity of inorganic nitrogen relased in bare fallow soil after bincorporation.
650 $aBrazil
650 $aFerralsols
650 $agreen manures
650 $alegumes
650 $anitrogen
650 $asoybeans
650 $aAdubo Verde
650 $aCerrado
650 $aGlycine Max
650 $aLeguminosa
650 $aMilho
650 $aMucuna
650 $aNitrogênio
650 $aOxisol
650 $aSoja
650 $aZea Mays
653 $aBrasil
653 $aFerrasols
653 $aMaize
653 $aMucuma aterrima: Soja
653 $aMucuna aterrima
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