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Produtividade e qualidade de uma pastagem de Lolium perenne e Trifolium repens e de uma pastagem à base de espécies espontâneas, instaladas numa zona de média altitude da ilha Terceira (Açores)
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Abstract(s)
Esta tese compara a produtividade e a qualidade da erva obtidas numa pastagem semeada de Lolium perenne e Trifolium repens e numa pastagem à base de espécies espontâneas, numa zona de média altitude dos Açores.
No primeiro capítulo fez-se uma introdução geral em que se procurou, com base na revisão bibliográfica, apresentar as principais espécies pratenses existentes nas pastagens permanentes de média altitude dos Açores e as principais condições edafo-climáticas e de maneio que contribuem para a sua dominância. […].
No segundo capítulo apresentamos quatro ensaios efectuados entre 1987 e 1989, numa zona de média altitude (390 m), no interior da Ilha Terceira, Açores. […].
No terceiro capítulo descrevemos um ensaio conduzido durante 3 anos, de Outubro de 1993 a Outubro de 1996. Este ensaio instalou-se simultaneamente numa pastagem semeada de Lolium perenne e Trifolium repens e numa pastagem onde, após uma cultura de milho híbrido para silagem, se semeou apenas Trifolium repens e durante um ano se deixou instalar espécies espontâneas. […].
ABSTRACT: At the medium altitude of Terceira Island (Azores) there are two main types of pastures, seeded pastures of Lolium perenne L. and Trifolium repens L. and permanent pastures composed mainly with secondary grass species, dominated by Poa trivialis L. or Holcus lanatus L. It is important to know, for each one of these pastures, the seasonal pattern of dry matter production and the quality of the herbage obtained when they are submitted to different managements. The experiments described on this thesis are an attempt to contribute to this knowledge. On a first period (1987 to 1989) it was studied the productivity of a pasture of L. perenne and T. repens (LP) and that of a permanent pasture (ESP) composed mainly by P. trivialis, on a simulated system of intensive production. For this purpose four experiments were installed simultaneously in the two pastures. One experiment was designed to investigate the seasonal pattern of dry matter production in an intensive production system. […]. On the third chapter we describe a trial conducted during three years, from October of 1993 to October of 1996. This trial was installed simultaneously, in a randomized complete block design with three blocks, in a pasture seeded with Lolium perenne and Trifolium repens and in a pasture where, after a culture of hybrid maize for silage, only Trifolium repens was seeded and during one year the spontaneous species were allowed to grow. […].
ABSTRACT: At the medium altitude of Terceira Island (Azores) there are two main types of pastures, seeded pastures of Lolium perenne L. and Trifolium repens L. and permanent pastures composed mainly with secondary grass species, dominated by Poa trivialis L. or Holcus lanatus L. It is important to know, for each one of these pastures, the seasonal pattern of dry matter production and the quality of the herbage obtained when they are submitted to different managements. The experiments described on this thesis are an attempt to contribute to this knowledge. On a first period (1987 to 1989) it was studied the productivity of a pasture of L. perenne and T. repens (LP) and that of a permanent pasture (ESP) composed mainly by P. trivialis, on a simulated system of intensive production. For this purpose four experiments were installed simultaneously in the two pastures. One experiment was designed to investigate the seasonal pattern of dry matter production in an intensive production system. […]. On the third chapter we describe a trial conducted during three years, from October of 1993 to October of 1996. This trial was installed simultaneously, in a randomized complete block design with three blocks, in a pasture seeded with Lolium perenne and Trifolium repens and in a pasture where, after a culture of hybrid maize for silage, only Trifolium repens was seeded and during one year the spontaneous species were allowed to grow. […].
Description
Tese de Doutoramento, Ciências Agrárias (especialidade de Fitotecnia), 3 de Dezembro de 2010, Universidade dos Açores.
Keywords
Lolium perenne Trifolium repens Adubação Azotada Biodiversidade Erva (Nível de Azoto) Pastagem
Citation
Gomes, Anabela Mancebo (2010). "Produtividade e qualidade de uma pastagem de Lolium perenne e Trifolium repens e de uma pastagem à base de espécies espontâneas, instaladas numa zona de média altitude da ilha Terceira (Açores)", 174 p.. Tese de doutoramento em Ciências Agrárias (especialidade de Fitotecnia). Angra do Heroísmo: Universidade dos Açores. [Consult. Dia Mês Ano]. Disponível em www:<http://hdl.handle.net/10400.3/6093>.