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Registro Completo |
Biblioteca(s): |
Embrapa Cerrados. |
Data corrente: |
25/10/1999 |
Data da última atualização: |
25/10/1999 |
Autoria: |
SILVA, J. H. S. da. |
Título: |
The effects of age of regrowth, day lengh and ambient air temperature on the growth and quality of three forage species. |
Ano de publicação: |
1981 |
Fonte/Imprenta: |
Raleigh: North Carolina State University, 1981. |
Páginas: |
197p. |
Idioma: |
Inglês |
Notas: |
Ph.D.Thesis. |
Conteúdo: |
Coastal bermudagrass (Cynodon dactylon (L) Pers.), Pennisetum flacidum Griseb. and tall fescue ((Festuca arudinacea Schreeb.) were transplanted into 25,44 cm-diameter pots. After 3 weeks of regrowth under greenhouse conditions, all pots were clipped and placed in 8 chambers set at 9 or 12 hours of daylength and 18/14, 22/18, 26/22 or 30/26 oC of day/night temperature. There were two replications in tine and two successive harvests were made after either 1.5, 3.0, 4.5 or 6.a weeks of regrowth. At each harvest, yield per pot was determined and a set of 8 plants was selected from each pot for morphological and anatomical determinations in leaves and stems. In addition, a sample of forage from each pots was prepared for chemical analyses and in vitro digestibility measurements. The average dry matter (DM) yelds were 69.1, 39.8 and 27.1 g/pot for P. flaccidum, fescue and bermudagrass (P < 0.01). Yelds increased with increasing with increasing age of harvest in all three species (P < 0.01). At the same age (above 1.5 weeks) bermudagrass yields increased with increasing temperature, but the rates of increase were lower with 12 than with 9 hours of light. In fescue older than 3 weeks, DM yields were higher at 22/18 than at 18.14 oC but decreased with further increases in temperature. The ratio of stem weigth (including leaf sheaths) no leaf weigth was higher with increasing age in all species (P < 0.01). Fescue rad lower (P < 0.01) ratios (0.19) than P. flaccidum (0.82) andf bermudagrass (1.16). These rations increased with increasing temperature in bermudagrass at 4.5 weeks and in P. flaccidum up to that same age but were influenced by daylength. In fescue, the stem-to-leaf ratio decreased with increasing temperature at 3.0 or 4.5 weeks. Fescue differed from the warm-seasom grasses in the proportion of vascular tissue area (P < 0.01), which reflected the differing proportions of bundle sheath areas. In bermudagrass, P. flaccidum and fescue, respectively, the bundle sheaths accounded for an average of 27.9, 11.6 and 9.7 percent of the total leaf cross saction and 7.9, 8.9 and 19.0 percent of the total stem cross section. These proportions decreased with increasing age in leaves (all species) and increased with increasing temperature in stems of P. flaccidum. The variation in the proportion of the various tissues was accompanied by different rations of leaf thickness and interveinal distance to vascular bundle diameter. In terms of chemical composition, fescue had significantly lower proportions of cell wall constituents than the two wam-season grasses (P < 0.01). In fescue, levels of neutral detergent fiber (NDF) increased with maturity and with temperature up to 26/22oC. This was a reflection of increases in hemicellulose, cellulose and lignind. Coastal bermudagrass had higher levels of hemicellulose and acid-insoluble ash but lower levels of cellulose than P. flaccidum. These fractions increased with age and temperature in both species except that hemicellulose remained unchanged in bermudagrass and decreased in P. flaccidum. The average values df in vitro cell wall digestibity (IVCWD) were 69.5, 70.2 and 75.1 percent for bermudagrass, P. flaccidum and fescue, respectively. These values declined with temperature and and their interactive effect. In vitro dry matter digestibility (IVDMD) generally followed the same trends as IVCWD. It is sugested that morphological and anatomical parameters evaluated in this studycan help explain certain genetic and enviromental effects on forage digestibility. MenosCoastal bermudagrass (Cynodon dactylon (L) Pers.), Pennisetum flacidum Griseb. and tall fescue ((Festuca arudinacea Schreeb.) were transplanted into 25,44 cm-diameter pots. After 3 weeks of regrowth under greenhouse conditions, all pots were clipped and placed in 8 chambers set at 9 or 12 hours of daylength and 18/14, 22/18, 26/22 or 30/26 oC of day/night temperature. There were two replications in tine and two successive harvests were made after either 1.5, 3.0, 4.5 or 6.a weeks of regrowth. At each harvest, yield per pot was determined and a set of 8 plants was selected from each pot for morphological and anatomical determinations in leaves and stems. In addition, a sample of forage from each pots was prepared for chemical analyses and in vitro digestibility measurements. The average dry matter (DM) yelds were 69.1, 39.8 and 27.1 g/pot for P. flaccidum, fescue and bermudagrass (P < 0.01). Yelds increased with increasing with increasing age of harvest in all three species (P < 0.01). At the same age (above 1.5 weeks) bermudagrass yields increased with increasing temperature, but the rates of increase were lower with 12 than with 9 hours of light. In fescue older than 3 weeks, DM yields were higher at 22/18 than at 18.14 oC but decreased with further increases in temperature. The ratio of stem weigth (including leaf sheaths) no leaf weigth was higher with increasing age in all species (P < 0.01). Fescue rad lower (P < 0.01) ratios (0.19) than P. flaccidum (0.82) andf bermud... Mostrar Tudo |
Palavras-Chave: |
Feed grasses; Foragem; Growth; Lawn grasses; Pennisetum flacidum. |
Thesagro: |
Crescimento; Cynodon Dactylon; Festuca; Festuca Arundinacea; Grama Bermuda; Gramínea Forrageira; Idade; Temperatura. |
Thesaurus Nal: |
age; air temperature. |
Categoria do assunto: |
-- |
Marc: |
LEADER 04421nam a2200313 a 4500 001 1559282 005 1999-10-25 008 1981 bl uuuu m 00u1 u #d 100 1 $aSILVA, J. H. S. da 245 $aThe effects of age of regrowth, day lengh and ambient air temperature on the growth and quality of three forage species. 260 $aRaleigh: North Carolina State University$c1981 300 $a197p. 500 $aPh.D.Thesis. 520 $aCoastal bermudagrass (Cynodon dactylon (L) Pers.), Pennisetum flacidum Griseb. and tall fescue ((Festuca arudinacea Schreeb.) were transplanted into 25,44 cm-diameter pots. After 3 weeks of regrowth under greenhouse conditions, all pots were clipped and placed in 8 chambers set at 9 or 12 hours of daylength and 18/14, 22/18, 26/22 or 30/26 oC of day/night temperature. There were two replications in tine and two successive harvests were made after either 1.5, 3.0, 4.5 or 6.a weeks of regrowth. At each harvest, yield per pot was determined and a set of 8 plants was selected from each pot for morphological and anatomical determinations in leaves and stems. In addition, a sample of forage from each pots was prepared for chemical analyses and in vitro digestibility measurements. The average dry matter (DM) yelds were 69.1, 39.8 and 27.1 g/pot for P. flaccidum, fescue and bermudagrass (P < 0.01). Yelds increased with increasing with increasing age of harvest in all three species (P < 0.01). At the same age (above 1.5 weeks) bermudagrass yields increased with increasing temperature, but the rates of increase were lower with 12 than with 9 hours of light. In fescue older than 3 weeks, DM yields were higher at 22/18 than at 18.14 oC but decreased with further increases in temperature. The ratio of stem weigth (including leaf sheaths) no leaf weigth was higher with increasing age in all species (P < 0.01). Fescue rad lower (P < 0.01) ratios (0.19) than P. flaccidum (0.82) andf bermudagrass (1.16). These rations increased with increasing temperature in bermudagrass at 4.5 weeks and in P. flaccidum up to that same age but were influenced by daylength. In fescue, the stem-to-leaf ratio decreased with increasing temperature at 3.0 or 4.5 weeks. Fescue differed from the warm-seasom grasses in the proportion of vascular tissue area (P < 0.01), which reflected the differing proportions of bundle sheath areas. In bermudagrass, P. flaccidum and fescue, respectively, the bundle sheaths accounded for an average of 27.9, 11.6 and 9.7 percent of the total leaf cross saction and 7.9, 8.9 and 19.0 percent of the total stem cross section. These proportions decreased with increasing age in leaves (all species) and increased with increasing temperature in stems of P. flaccidum. The variation in the proportion of the various tissues was accompanied by different rations of leaf thickness and interveinal distance to vascular bundle diameter. In terms of chemical composition, fescue had significantly lower proportions of cell wall constituents than the two wam-season grasses (P < 0.01). In fescue, levels of neutral detergent fiber (NDF) increased with maturity and with temperature up to 26/22oC. This was a reflection of increases in hemicellulose, cellulose and lignind. Coastal bermudagrass had higher levels of hemicellulose and acid-insoluble ash but lower levels of cellulose than P. flaccidum. These fractions increased with age and temperature in both species except that hemicellulose remained unchanged in bermudagrass and decreased in P. flaccidum. The average values df in vitro cell wall digestibity (IVCWD) were 69.5, 70.2 and 75.1 percent for bermudagrass, P. flaccidum and fescue, respectively. These values declined with temperature and and their interactive effect. In vitro dry matter digestibility (IVDMD) generally followed the same trends as IVCWD. It is sugested that morphological and anatomical parameters evaluated in this studycan help explain certain genetic and enviromental effects on forage digestibility. 650 $aage 650 $aair temperature 650 $aCrescimento 650 $aCynodon Dactylon 650 $aFestuca 650 $aFestuca Arundinacea 650 $aGrama Bermuda 650 $aGramínea Forrageira 650 $aIdade 650 $aTemperatura 653 $aFeed grasses 653 $aForagem 653 $aGrowth 653 $aLawn grasses 653 $aPennisetum flacidum
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Registro Completo
Biblioteca(s): |
Embrapa Recursos Genéticos e Biotecnologia. |
Data corrente: |
08/11/2010 |
Data da última atualização: |
08/11/2010 |
Tipo da produção científica: |
Capítulo em Livro Técnico-Científico |
Autoria: |
FORZZA, R. C.; BAUMGRATZ, J. F. A.; BICUDO, C. E. M.; CANHOS, D. A. L.; CARVALHO JÚNIOR, A. A.; COSTA, A.; COSTA, D. P.; HOPKINS, M.; LEITMAN, P. M.; LOHMANN, L. G.; LUGHADHA, E. N.; MAIA, L. C.; MARTINELLI, G.; MENEZES, M.; MORIM, M. P.; COELHO, M. A. N.; PEIXOTO, A. L.; PIRANI, J. R.; PRADO, J.; QUEIROZ, L. P.; SOUZA, S. de; SOUZA, V. C.; STEHMANN, J. R.; SYLVESTRE, L. S.; WALTER, B. M. T.; ZAPPI, D. |
Afiliação: |
BRUNO MACHADO TELES WALTER, CENARGEN. |
Título: |
Síntese da diversidade brasileira. |
Ano de publicação: |
2010 |
Fonte/Imprenta: |
In: FORZZA, R. C.; BAUMGRATZ, J. F.; BICUDO, C. E. M.; CARVALHO JÚNIOR, A. A.; COSTA, A.; COSTA, D. P.; HOPKINS, M.; LEITMAN, P. M.; LOHMANN, L. G.; MAIA, L. C.; MARTINELLI, G.; MENEZES, M.; MORIM, M. P.; COELHO, M. A. N.; PEIXOTO, A. L.; PIRANI, J. R.; PRADO, J.; QUEIROZ, L. P.; SOUZA, V. C.; STEHMANN, J. R.; SYLVESTRE, L. S.; WALTER, B. M. T.; ZAPPI, D. (Ed.). Catálogo de plantas e fungos do Brasil Rio de Janeiro: Andrea Jakobsson Estúdio: Instituto de Pesquisas Jardim Botânico do Rio de Janeiro, 2010. |
Volume: |
v. 1 |
Páginas: |
p. 21-42 |
Idioma: |
Português |
Palavras-Chave: |
Brasil; Catálogo. |
Thesagro: |
Fungo. |
Categoria do assunto: |
-- |
Marc: |
LEADER 01645naa a2200469 a 4500 001 1866377 005 2010-11-08 008 2010 bl uuuu u00u1 u #d 100 1 $aFORZZA, R. C. 245 $aSíntese da diversidade brasileira. 260 $c2010 300 $ap. 21-42 v. 1 490 $vv. 1 650 $aFungo 653 $aBrasil 653 $aCatálogo 700 1 $aBAUMGRATZ, J. F. A. 700 1 $aBICUDO, C. E. M. 700 1 $aCANHOS, D. A. L. 700 1 $aCARVALHO JÚNIOR, A. A. 700 1 $aCOSTA, A. 700 1 $aCOSTA, D. P. 700 1 $aHOPKINS, M. 700 1 $aLEITMAN, P. M. 700 1 $aLOHMANN, L. G. 700 1 $aLUGHADHA, E. N. 700 1 $aMAIA, L. C. 700 1 $aMARTINELLI, G. 700 1 $aMENEZES, M. 700 1 $aMORIM, M. P. 700 1 $aCOELHO, M. A. N. 700 1 $aPEIXOTO, A. L. 700 1 $aPIRANI, J. R. 700 1 $aPRADO, J. 700 1 $aQUEIROZ, L. P. 700 1 $aSOUZA, S. de 700 1 $aSOUZA, V. C. 700 1 $aSTEHMANN, J. R. 700 1 $aSYLVESTRE, L. S. 700 1 $aWALTER, B. M. T. 700 1 $aZAPPI, D. 773 $tIn: FORZZA, R. C.; BAUMGRATZ, J. F.; BICUDO, C. E. M.; CARVALHO JÚNIOR, A. A.; COSTA, A.; COSTA, D. P.; HOPKINS, M.; LEITMAN, P. M.; LOHMANN, L. G.; MAIA, L. C.; MARTINELLI, G.; MENEZES, M.; MORIM, M. P.; COELHO, M. A. N.; PEIXOTO, A. L.; PIRANI, J. R.; PRADO, J.; QUEIROZ, L. P.; SOUZA, V. C.; STEHMANN, J. R.; SYLVESTRE, L. S.; WALTER, B. M. T.; ZAPPI, D. (Ed.). Catálogo de plantas e fungos do Brasil Rio de Janeiro: Andrea Jakobsson Estúdio: Instituto de Pesquisas Jardim Botânico do Rio de Janeiro, 2010.
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