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Registro Completo |
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Biblioteca(s): |
Embrapa Soja; Embrapa Trigo. |
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Data corrente: |
17/10/1995 |
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Data da última atualização: |
01/06/2006 |
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Autoria: |
BORKERT, C. M. |
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Afiliação: |
EMBRAPA-CNPSo. Londrina, PR. |
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Título: |
Mechanistic modeling of phosphate placement to maximize phosphate recovery by soybeans. |
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Ano de publicação: |
1983 |
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Fonte/Imprenta: |
West Lafayette: Purdue University, 1983. |
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Páginas: |
175p. |
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Idioma: |
Inglês |
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Notas: |
Ph.D. Thesis. |
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Conteúdo: |
Previous research has shown inconsistent results from P fertilizer placement. The objective of this research was to study the effect on the mechanisms governing P uptake when fertilizer is placed in various volume fractions of the soil. Experiments were conducted in pots in a controlled climate chamber. Kinetic parameters for P uptake, root distribution and morphology and soil supply parameters were measured. Increasing rate of P added to the soil increased P concentration in soil solution (Cl) and the P diffusion coefficient (De), while decreasing the buffer power (b). The initial rate of added P increased root length and decreased root radius, while higher rates of P depressed root growth. Rate of P uptake (influx) increased as Cl increased, however, yield reached a maximum and then decreased when Cl became very high. The effects of P placement on soil and plant parameters were studied by decreasing the soil volume to which the same rate of P per pot was added. Values of soil parameters were determined for both P fertilized and unfertilized soil. Adding P fertilizer to decreasing soil volumes stimulated root growth in the fertilized portion while the root redius became smaller in this zone. The relation between volume fraction of the soil fertilized by P and fraction of the total root length that was in the fertilized soil could be described by Y = X 0.70, where X is the proportion of the soil volume treated with P and Y is the predicted proportion of total root length in the P treated soil. In a split-root ... MenosPrevious research has shown inconsistent results from P fertilizer placement. The objective of this research was to study the effect on the mechanisms governing P uptake when fertilizer is placed in various volume fractions of the soil. Experiments were conducted in pots in a controlled climate chamber. Kinetic parameters for P uptake, root distribution and morphology and soil supply parameters were measured. Increasing rate of P added to the soil increased P concentration in soil solution (Cl) and the P diffusion coefficient (De), while decreasing the buffer power (b). The initial rate of added P increased root length and decreased root radius, while higher rates of P depressed root growth. Rate of P uptake (influx) increased as Cl increased, however, yield reached a maximum and then decreased when Cl became very high. The effects of P placement on soil and plant parameters were studied by decreasing the soil volume to which the same rate of P per pot was added. Values of soil parameters were determined for both P fertilized and unfertilized soil. Adding P fertilizer to decreasing soil volumes stimulated root growth in the fertilized portion while the root redius became smaller in this zone. The relation between volume fraction of the soil fertilized by P and fraction of the total root length that was in the fertilized soil could be described by Y = X 0.70, where X is the proportion of the soil volume treated with P and Y is the predicted proportion of total root length in ... Mostrar Tudo |
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Palavras-Chave: |
Availability; Disponibilidade; EUA; Growth; Phosphate; Soybean; USA. |
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Thesagro: |
Crescimento; Fosfato; Fósforo; Soja; Solo. |
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Thesaurus Nal: |
phosphorus; soil. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02261nam a2200301 a 4500
001 1459042
005 2006-06-01
008 1983 bl uuuu m 00u1 u #d
100 1 $aBORKERT, C. M.
245 $aMechanistic modeling of phosphate placement to maximize phosphate recovery by soybeans.
260 $aWest Lafayette: Purdue University$c1983
300 $a175p.
500 $aPh.D. Thesis.
520 $aPrevious research has shown inconsistent results from P fertilizer placement. The objective of this research was to study the effect on the mechanisms governing P uptake when fertilizer is placed in various volume fractions of the soil. Experiments were conducted in pots in a controlled climate chamber. Kinetic parameters for P uptake, root distribution and morphology and soil supply parameters were measured. Increasing rate of P added to the soil increased P concentration in soil solution (Cl) and the P diffusion coefficient (De), while decreasing the buffer power (b). The initial rate of added P increased root length and decreased root radius, while higher rates of P depressed root growth. Rate of P uptake (influx) increased as Cl increased, however, yield reached a maximum and then decreased when Cl became very high. The effects of P placement on soil and plant parameters were studied by decreasing the soil volume to which the same rate of P per pot was added. Values of soil parameters were determined for both P fertilized and unfertilized soil. Adding P fertilizer to decreasing soil volumes stimulated root growth in the fertilized portion while the root redius became smaller in this zone. The relation between volume fraction of the soil fertilized by P and fraction of the total root length that was in the fertilized soil could be described by Y = X 0.70, where X is the proportion of the soil volume treated with P and Y is the predicted proportion of total root length in the P treated soil. In a split-root ...
650 $aphosphorus
650 $asoil
650 $aCrescimento
650 $aFosfato
650 $aFósforo
650 $aSoja
650 $aSolo
653 $aAvailability
653 $aDisponibilidade
653 $aEUA
653 $aGrowth
653 $aPhosphate
653 $aSoybean
653 $aUSA
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Registro original: |
Embrapa Soja (CNPSO) |
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Registro Completo
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Biblioteca(s): |
Embrapa Semiárido. |
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Data corrente: |
16/11/1998 |
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Data da última atualização: |
26/04/2019 |
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Tipo da produção científica: |
Artigo em Anais de Congresso |
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Autoria: |
ARAUJO, G. G. L. de; SILVA, J. F. C. da; VALADARES FILHO, S. de C.; CAMPOS, O. F. de; SIGNORETTI, R. D.; TURCO, S. H. N. |
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Afiliação: |
GHERMAN GARCIA LEAL DE ARAUJO, CPATSA. |
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Título: |
Exigencias liquidas de macroelementos minerais de bezerros recebendo dietas com diferentes niveis de volumoso. |
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Ano de publicação: |
1998 |
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Fonte/Imprenta: |
In: REUNIÃO ANUAL DA SOCIEDADE BRASILEIRA DE ZOOTECNIA, 35., 1998, Botucatu, SP. Anais... Botucatu: SBZ, 1998. |
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Páginas: |
v.1, p. 335-337. |
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Idioma: |
Português |
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Conteúdo: |
Foram estudados os efeitos dos diferentes niveis de volumoso nas dietas sobre as exigencas liquidas de calcio (Ca), fosforo (P) e magnesio (Mg). Usaram-se 48 bezerros mesticos nao-castrados, com idade aproximada de 60 dias e peso vivo medio inicial de 60 Kg. Oito animais foram abatidos ao inicio do experimento, para servir de referencia; oito receberam 90% do volumoso e 10% de concentrado (T5), para atender as exigencias ligeiramente acima da mantenca; e os 32 restantes foram alimentados a vontade e distribuidos em quatro grupos de oito animais, de acordo com cada sistema de alimentacao (Tratamentos), com os seguintes niveis de volumoso nas dietas na base da materia seca: T1 = 10%; T2 = 25%; T3 = 40% e T4 = 55%. Observou-se que as deposicoes de calcio e magnesio para ganho em relacao ao peso de corpo vazio aumentaram, a medida que o peso do animal se elevou de 60 a 300 kg de peso vivo, para todos niveis de volumoso. Conclui-se que as exigencias liquidas, obtidas pela equacao geral, para ganho de 1 kg de peso de corpo vazio, para bovinos com peso entre 60 a 300 kg, variaram de 16,85 a 15,72 g para Ca; 8,56 a 8,51 g para P e de 0,27 a 0,34 para Mg. |
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Palavras-Chave: |
Composicao corporal; Exigencia liquida; Liquid requirements; Mineral nutrition; Nutricao mineral. |
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Thesagro: |
Bezerro; Cálcio; Fósforo; Magnésio. |
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Thesaurus NAL: |
calcium; calves; magnesium; phosphorus. |
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Categoria do assunto: |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/196524/1/Reuniao-de-zootecnia-pag-335-337.pdf
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Marc: |
LEADER 02174nam a2200337 a 4500
001 1131512
005 2019-04-26
008 1998 bl uuuu u00u1 u #d
100 1 $aARAUJO, G. G. L. de
245 $aExigencias liquidas de macroelementos minerais de bezerros recebendo dietas com diferentes niveis de volumoso.
260 $aIn: REUNIÃO ANUAL DA SOCIEDADE BRASILEIRA DE ZOOTECNIA, 35., 1998, Botucatu, SP. Anais... Botucatu: SBZ$c1998
300 $av.1, p. 335-337.
520 $aForam estudados os efeitos dos diferentes niveis de volumoso nas dietas sobre as exigencas liquidas de calcio (Ca), fosforo (P) e magnesio (Mg). Usaram-se 48 bezerros mesticos nao-castrados, com idade aproximada de 60 dias e peso vivo medio inicial de 60 Kg. Oito animais foram abatidos ao inicio do experimento, para servir de referencia; oito receberam 90% do volumoso e 10% de concentrado (T5), para atender as exigencias ligeiramente acima da mantenca; e os 32 restantes foram alimentados a vontade e distribuidos em quatro grupos de oito animais, de acordo com cada sistema de alimentacao (Tratamentos), com os seguintes niveis de volumoso nas dietas na base da materia seca: T1 = 10%; T2 = 25%; T3 = 40% e T4 = 55%. Observou-se que as deposicoes de calcio e magnesio para ganho em relacao ao peso de corpo vazio aumentaram, a medida que o peso do animal se elevou de 60 a 300 kg de peso vivo, para todos niveis de volumoso. Conclui-se que as exigencias liquidas, obtidas pela equacao geral, para ganho de 1 kg de peso de corpo vazio, para bovinos com peso entre 60 a 300 kg, variaram de 16,85 a 15,72 g para Ca; 8,56 a 8,51 g para P e de 0,27 a 0,34 para Mg.
650 $acalcium
650 $acalves
650 $amagnesium
650 $aphosphorus
650 $aBezerro
650 $aCálcio
650 $aFósforo
650 $aMagnésio
653 $aComposicao corporal
653 $aExigencia liquida
653 $aLiquid requirements
653 $aMineral nutrition
653 $aNutricao mineral
700 1 $aSILVA, J. F. C. da
700 1 $aVALADARES FILHO, S. de C.
700 1 $aCAMPOS, O. F. de
700 1 $aSIGNORETTI, R. D.
700 1 $aTURCO, S. H. N.
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