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Registro Completo |
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Biblioteca(s): |
Embrapa Pantanal. |
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Data corrente: |
11/05/2010 |
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Data da última atualização: |
19/07/2018 |
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Autoria: |
RODRIGUES, L. R. de A. |
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Afiliação: |
University of Florida (Florida, USA). |
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Título: |
Morphological and physiological responses of dwarf elephantgrass (Pennisetum purpureum L. Schum. to grassing management. |
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Ano de publicação: |
1984 |
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Fonte/Imprenta: |
Florida: University of Florida, 1984. |
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Páginas: |
192p.il. |
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Idioma: |
Inglês |
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Notas: |
Ph.D. Dissertation. |
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Conteúdo: |
Morphological and physiological characteristics of dwarf elephantgrass (Pennisetum purpureum (L.) Schum.) were studied in a grazing trial conducted in 1982 at the University of Florida, Gainesville. The grass was subjected to the effects of two management factors, each at five levels as follows: lenght of grazing cycle (GC) (continuous grazing, 14, 28, 42 and 56 days) and grazing pressure (GP) (500, 1000, 1500, 2000, and 2500 kg of leaf dry matter ha-1 left after grazing). A grazing cycle consisted of a 2-day grazing period followed by an appropriate rest period to attain the desired lenght of GC. Response surfance methodology was used to study 13 treatment combinations, each with 2 replications, arranged in a modified nonrotatable central composite design. The data obtained were analysed using a complete second order polynomial model. Increasses in GC and decreases in GP increased plant height, apical meristems height, stem height, number of internodes per tiller, DM produced by live and dead leaves, DM production of leaf blades (LB), leaf stheaths (LS), and stems (S), area of green LB, and number of dead leaves per main tiller. The percentage of apical meristems eliminated was greater under continuous grazing and high GP. The number of axillary buds per tiller was depressed under high GP. Shorter internodes were observed at short GC and high GP. Leaves per main tiller increased when GP was decreased. Main tillers per plant and basal tillers per tiller increased with decreased GC and increased GP. Primary tillers constituted the predominant form of tillering in this grass. Grass LB/(LS + S) ratio was greater at long GCs in combination with low and high GPs. Concentrations of TNC in stem bases of the grass were affected mainly by the lenght of GC and were lower at short GCs and high GPs. The results obtained in this experiment indicate that dwarf elephantgrass has the ability to adapt itself to different grazing situations and should be considered as a promising species for pastures. MenosMorphological and physiological characteristics of dwarf elephantgrass (Pennisetum purpureum (L.) Schum.) were studied in a grazing trial conducted in 1982 at the University of Florida, Gainesville. The grass was subjected to the effects of two management factors, each at five levels as follows: lenght of grazing cycle (GC) (continuous grazing, 14, 28, 42 and 56 days) and grazing pressure (GP) (500, 1000, 1500, 2000, and 2500 kg of leaf dry matter ha-1 left after grazing). A grazing cycle consisted of a 2-day grazing period followed by an appropriate rest period to attain the desired lenght of GC. Response surfance methodology was used to study 13 treatment combinations, each with 2 replications, arranged in a modified nonrotatable central composite design. The data obtained were analysed using a complete second order polynomial model. Increasses in GC and decreases in GP increased plant height, apical meristems height, stem height, number of internodes per tiller, DM produced by live and dead leaves, DM production of leaf blades (LB), leaf stheaths (LS), and stems (S), area of green LB, and number of dead leaves per main tiller. The percentage of apical meristems eliminated was greater under continuous grazing and high GP. The number of axillary buds per tiller was depressed under high GP. Shorter internodes were observed at short GC and high GP. Leaves per main tiller increased when GP was decreased. Main tillers per plant and basal tillers per tiller increased with decre... Mostrar Tudo |
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Palavras-Chave: |
Elephantgrass; Management; Morfologia; Morfological; Pastagem tropical; Pasture; Physiological; Quality. |
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Thesagro: |
Agronomia; Capim Elefante; Fisiologia; Manejo; Planta Forrageira; Qualidade. |
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Thesaurus Nal: |
agronomy; forage. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02888nam a2200325 a 4500
001 1789982
005 2018-07-19
008 1984 bl uuuu m 00u1 u #d
100 1 $aRODRIGUES, L. R. de A.
245 $aMorphological and physiological responses of dwarf elephantgrass (Pennisetum purpureum L. Schum. to grassing management.
260 $aFlorida: University of Florida$c1984
300 $a192p.il.
500 $aPh.D. Dissertation.
520 $aMorphological and physiological characteristics of dwarf elephantgrass (Pennisetum purpureum (L.) Schum.) were studied in a grazing trial conducted in 1982 at the University of Florida, Gainesville. The grass was subjected to the effects of two management factors, each at five levels as follows: lenght of grazing cycle (GC) (continuous grazing, 14, 28, 42 and 56 days) and grazing pressure (GP) (500, 1000, 1500, 2000, and 2500 kg of leaf dry matter ha-1 left after grazing). A grazing cycle consisted of a 2-day grazing period followed by an appropriate rest period to attain the desired lenght of GC. Response surfance methodology was used to study 13 treatment combinations, each with 2 replications, arranged in a modified nonrotatable central composite design. The data obtained were analysed using a complete second order polynomial model. Increasses in GC and decreases in GP increased plant height, apical meristems height, stem height, number of internodes per tiller, DM produced by live and dead leaves, DM production of leaf blades (LB), leaf stheaths (LS), and stems (S), area of green LB, and number of dead leaves per main tiller. The percentage of apical meristems eliminated was greater under continuous grazing and high GP. The number of axillary buds per tiller was depressed under high GP. Shorter internodes were observed at short GC and high GP. Leaves per main tiller increased when GP was decreased. Main tillers per plant and basal tillers per tiller increased with decreased GC and increased GP. Primary tillers constituted the predominant form of tillering in this grass. Grass LB/(LS + S) ratio was greater at long GCs in combination with low and high GPs. Concentrations of TNC in stem bases of the grass were affected mainly by the lenght of GC and were lower at short GCs and high GPs. The results obtained in this experiment indicate that dwarf elephantgrass has the ability to adapt itself to different grazing situations and should be considered as a promising species for pastures.
650 $aagronomy
650 $aforage
650 $aAgronomia
650 $aCapim Elefante
650 $aFisiologia
650 $aManejo
650 $aPlanta Forrageira
650 $aQualidade
653 $aElephantgrass
653 $aManagement
653 $aMorfologia
653 $aMorfological
653 $aPastagem tropical
653 $aPasture
653 $aPhysiological
653 $aQuality
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Embrapa Pantanal (CPAP) |
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