Data/hora: 04/06/2024 21:53:25

Biblioteca(s): | Embrapa Amazônia Ocidental; Embrapa Pantanal.
Data corrente: | 27/09/1995
Data da última atualização: | 31/10/2013
Autoria: | HUTTON, E. M.
Título: | Tropical pastures.
Ano de publicação: | 1970
Fonte/Imprenta: | Adv. Agron. v.22, p.1-73, 1970.
Idioma: | Inglês
Conteúdo: | In  the last decade tropical pasture research has culminated in the provision of persistent and productive legumes and grasses for use in pastures throughout the tropics. It has shown that, with proper fertilization and management of these cultivars, the tropics can produce considerably more beef and milk than at present. Although nitrogen fertilization of high quality grasses like pangola and kikuyu leads to high stocking rates and high production, the costs involved in this system are high, so it will be used only in special situations. Legume-based pasture will be the main system used in development of the extensive unused areas of the tropics for beef cattle as it is capable of markedly increasing production at relatively low cost. The studies on the interrelationships between legume, rhizobium, plant nutrients, and soil type have made it possible to succesfully establish legumes in pastures in most tropical areas. The finding that the majority of tropical legumes and their  assoicated rhizobia are adapted to acid soils is of special significance in tropical  development. Determination of critical percentages of the major elements sufficient for maximum growth of the different legumes has given a sound basis for fertilization of tropical pasture. Characterization of the associate grasses in this respect has commenced but requires much more attention if a proper understanding of the mineral balance in tropical pastures is to be obtained. One question which needs to be resolved is whether the mineral content of pasture giving maximum dry matter yield is at a sufficiently high level for maxinum animal production. More work is required on the physiological and biochemical characterization of the different species so that their deficiencies relative to pasture and animal production in various tropical environments can be determined. This will provide a better basis for plant introduction and breeding activities and for management studies aimed at maximizing yields of digestible nutrients and animal products from the pasture. A proportion of the physiological work needs to be done in the field so that it is possible to ascertain the factors involved in the persistence and compatibility of cultivars in grazed pastures. Determination of the biochemical and physiological bases for the relatively low feeding value of tropical grasses is an important problem. Until this is solved, it will be difficult to improve the efficiency of conversion of tropical pasture into animal products. Future progress in tropical pasture research is dependent on maintaining the ecosystem approach, in which the interactions between soil, pasture, and animal are intensively studied in pastures in different environments. Use of modern computer techniques are essential to fully assess these interactions and devise methods for improving output from tropical pastures.
Palavras-Chave: | Pastagem tropical.
Thesaurus Nal: | tropical pastures.
Categoria do assunto: | --
Registro original: | Embrapa Amazônia Ocidental (CPAA)

Exemplares:

CPAP - (29916-1) - ADD - SP - -- - SP1284 -  - 1284 - DIS
CPAA - (25987-1) - ADD - SP - PP - S0495 -  - S0495 - DIS