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Biblioteca(s): |
Biblioteca Rui Tendinha. |
Data corrente: |
11/03/2016 |
Data da última atualização: |
11/03/2016 |
Autoria: |
HUMPHREYS, L. R. |
Título: |
Tropical forages : their role in sustainable agriculture. |
Ano de publicação: |
1994 |
Fonte/Imprenta: |
Essex: Longman, 1994. |
Páginas: |
414p. |
ISBN: |
0582078687 |
Idioma: |
Português |
Conteúdo: |
Pressure on the land resources of the tropics and subtropics has increased as the numbers of people supported by the land have risen. The cultivation of uplands which are marginally suited to annual cropping has led to decreasing soil fertility and declining crop yields. Increased run-off from these lands has altered the hydrological characteristics of the watersheds, and the soil eroded represents the loss of irreplaceable resources. Continous monocropping leads to the development of intransigent problems of disease, pest or weed infestation. In the humid tropics plantation agriculture is vulnerable to world price fluctuations, and farmers dependent upon a single export commodity seek to diversify their operations. Tropical forages are playing an increasing role in the development of sustainable cropping systems, and a new technology of forage improvement has arisen. This book begins by outlining the objectives of the interaction between crops, pastures and animals. These may be directed primarily to the maintenance or repair of soil fertility, as reflected by the nitrogen accretion due to forage legumes, the organic matter status, attributes of soil structure, the control of erosion and the spatial transfer of nutrients. The integration of forages in cropping systems may also lead to more efficient utilization of environmental resources, as represented by energy flows, moisture conservation and crop protection, whilst the added flexibility of production can lead to diversification and stabilization of farm income. Principles for the management of various types of crop/forage systems are described. Pasture with tree crops may involve coconut, rubber, oil palm and fruit crops, representing developed land whose use may be intensified; or agroforestry in which timber and animal products are the outputs. Alley farming, in which shrub legumes are grown in conjunction with annual crops and are fed to livestock, has gained favour in some tropical regions as an innovative technology. The concept of ley pastures in rotation with annual crops requires revaluation, whilst the planting or regeneration of pastures after an annual cropping phase is widely practised. The integration of animals in annual cropping systems is favoured by companion or relay cropping with forage crop legumes, whilst the complementary use of crop and pasture lands is a feature of some systems where ruminants are used for draught as well as meat or milk. Environmental protection and the maintenance of agriculture require the wide adoption of forages in tropical cropping systems. This book outlines the science upon which this adoption may be based. MenosPressure on the land resources of the tropics and subtropics has increased as the numbers of people supported by the land have risen. The cultivation of uplands which are marginally suited to annual cropping has led to decreasing soil fertility and declining crop yields. Increased run-off from these lands has altered the hydrological characteristics of the watersheds, and the soil eroded represents the loss of irreplaceable resources. Continous monocropping leads to the development of intransigent problems of disease, pest or weed infestation. In the humid tropics plantation agriculture is vulnerable to world price fluctuations, and farmers dependent upon a single export commodity seek to diversify their operations. Tropical forages are playing an increasing role in the development of sustainable cropping systems, and a new technology of forage improvement has arisen. This book begins by outlining the objectives of the interaction between crops, pastures and animals. These may be directed primarily to the maintenance or repair of soil fertility, as reflected by the nitrogen accretion due to forage legumes, the organic matter status, attributes of soil structure, the control of erosion and the spatial transfer of nutrients. The integration of forages in cropping systems may also lead to more efficient utilization of environmental resources, as represented by energy flows, moisture conservation and crop protection, whilst the added flexibility... Mostrar Tudo |
Palavras-Chave: |
Agricultura sustentavel; Agriculture; Agroforestry; Agrossilvicultura; Consorciacao; Cropping systems; Culturas tropicais; Degradacao; Deterioracao; Erosao; Erosion; Farming systems; Feed crops; Fertilidade; Fertility; Fixacao de nitrogenio; Forage plants; Husbancry; Land resource; LForragem; Management; Manejo; Mixed cropping; Nitrogen fixation; Pastagem; Pastagens; Pasture; Pastures; Pecuaria; Pesquisa; Plant protection; Planta forrageira; Producao animal; Protecao de planta; Recurco da terra; Regiao tropical; Research; Sistema de producao; Sistemas; Soil deterioration; Soils; Solo; Sustainability; Sustainable agriculture; Sustentabilidade; Tropical crops; Tropicos; Tropics. |
Categoria do assunto: |
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Marc: |
LEADER 04496nam a2200709 a 4500 001 1010158 005 2016-03-11 008 1994 bl uuuu 00u1 u #d 020 $a0582078687 100 1 $aHUMPHREYS, L. R. 245 $aTropical forages$btheir role in sustainable agriculture. 260 $aEssex: Longman$c1994 300 $a414p. 520 $aPressure on the land resources of the tropics and subtropics has increased as the numbers of people supported by the land have risen. The cultivation of uplands which are marginally suited to annual cropping has led to decreasing soil fertility and declining crop yields. Increased run-off from these lands has altered the hydrological characteristics of the watersheds, and the soil eroded represents the loss of irreplaceable resources. Continous monocropping leads to the development of intransigent problems of disease, pest or weed infestation. In the humid tropics plantation agriculture is vulnerable to world price fluctuations, and farmers dependent upon a single export commodity seek to diversify their operations. Tropical forages are playing an increasing role in the development of sustainable cropping systems, and a new technology of forage improvement has arisen. This book begins by outlining the objectives of the interaction between crops, pastures and animals. These may be directed primarily to the maintenance or repair of soil fertility, as reflected by the nitrogen accretion due to forage legumes, the organic matter status, attributes of soil structure, the control of erosion and the spatial transfer of nutrients. The integration of forages in cropping systems may also lead to more efficient utilization of environmental resources, as represented by energy flows, moisture conservation and crop protection, whilst the added flexibility of production can lead to diversification and stabilization of farm income. Principles for the management of various types of crop/forage systems are described. Pasture with tree crops may involve coconut, rubber, oil palm and fruit crops, representing developed land whose use may be intensified; or agroforestry in which timber and animal products are the outputs. Alley farming, in which shrub legumes are grown in conjunction with annual crops and are fed to livestock, has gained favour in some tropical regions as an innovative technology. The concept of ley pastures in rotation with annual crops requires revaluation, whilst the planting or regeneration of pastures after an annual cropping phase is widely practised. The integration of animals in annual cropping systems is favoured by companion or relay cropping with forage crop legumes, whilst the complementary use of crop and pasture lands is a feature of some systems where ruminants are used for draught as well as meat or milk. Environmental protection and the maintenance of agriculture require the wide adoption of forages in tropical cropping systems. This book outlines the science upon which this adoption may be based. 653 $aAgricultura sustentavel 653 $aAgriculture 653 $aAgroforestry 653 $aAgrossilvicultura 653 $aConsorciacao 653 $aCropping systems 653 $aCulturas tropicais 653 $aDegradacao 653 $aDeterioracao 653 $aErosao 653 $aErosion 653 $aFarming systems 653 $aFeed crops 653 $aFertilidade 653 $aFertility 653 $aFixacao de nitrogenio 653 $aForage plants 653 $aHusbancry 653 $aLand resource 653 $aLForragem 653 $aManagement 653 $aManejo 653 $aMixed cropping 653 $aNitrogen fixation 653 $aPastagem 653 $aPastagens 653 $aPasture 653 $aPastures 653 $aPecuaria 653 $aPesquisa 653 $aPlant protection 653 $aPlanta forrageira 653 $aProducao animal 653 $aProtecao de planta 653 $aRecurco da terra 653 $aRegiao tropical 653 $aResearch 653 $aSistema de producao 653 $aSistemas 653 $aSoil deterioration 653 $aSoils 653 $aSolo 653 $aSustainability 653 $aSustainable agriculture 653 $aSustentabilidade 653 $aTropical crops 653 $aTropicos 653 $aTropics
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Biblioteca Rui Tendinha (BRT) |
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