Data/hora: 04/06/2024 08:09:17

Biblioteca(s): | Embrapa Amazônia Ocidental.
Data corrente: | 15/10/1998
Data da última atualização: | 23/08/2012
Autoria: | FERNANDES, E. C. M.
Título: | Alley cropping on acid soils.
Ano de publicação: | 1990
Fonte/Imprenta: | Raleigh: NCSU, 1990.
Páginas: | 157p.
Idioma: | Inglês
Notas: | Ph.D. Thesis.
Conteúdo: | Two greenhouse studies were undertaken to evaluate: 1) the effects of rock phosphate additions and VA mycorrhizas on growth and nodulation of Inga edulis, Erythrina sp., and Centrosema macrocarpum, and 2) shoot pruning effects on rood dynamics, VA mycorrhizal infections and P and N accumulation in inga and centrosema on an Ultisol. Non-mycorrhizal plants required additon to between 30kg P/ha to 40kg P/ha to attain the same shoot weight as mycorrhizal plants without added P. Plants with mycorrhizae and rhizobia had significantly more nodules than plants with rhizobia alone. Shoot pruning reduced  fine root biomass. The greater the intensity of shoot pruning the greater the decline in root biomass, VA mycorrhizal infection, and nodule activity. On acid soils with low P avalilability, additions of 20kg P/ha coupled with plant management to encourage vesicular arbuscular (VA) mycorrhizae could significantly improve the productivity of leguminous tree and pasture species. Two field experiments were performed on an Ultisol (pH 4.3 -4.4) to: 1) evaluate competition between inga hedgerows and crops in alley cropping; and 2) identify provenances of Gliricidia sepium with potential for alley cropping on acid soil. Root competition between inga hedgerows and crops became significant at eleven months after hedgerow establishment and resulted in lower grain yields from alley plots relative to non-alley controls. Fertilizer application and root pruning of hedgerows significantly improved yields across the shole alley. Root competition between hedgerows and crops, and asynchrony of nutrient release from inga prunings and nutrient demand by crops were porbably the main causes for low crop yields. Gliricidia provenance OFI 14/84 showed good tolerance to acid soil conditions and produced 60% more total biomass than the second ranked provenance. Selection of 14/84 for hedgerows in alley cropping, however, will result in excessive competition with crops. The use of less vigorous provenances may improve crop yields in alley cropping.
Palavras-Chave: | Centrosema macrocarpum; Consorciacao; Hedges; Origem; Phosphate fertilizers; Species; Tropical rain forest.
Thesagro: | Adubação; Espécie; Estufa; Floresta Tropical Úmida; Fosfato; Ingá Edulis; Micorriza; Nodulação; Planta Para Cerca Viva; Poda; Sistema de Cultivo; Solo Ácido.
Thesaurus Nal: | acid soils; alley cropping; Erythrina; Gliricidia sepium; greenhouses; mycorrhizae; nodulation; provenance; pruning.
Categoria do assunto: | --
Registro original: | Embrapa Amazônia Ocidental (CPAA)
Exemplares: | CPAA - (3026-1) - ADD - TS - PP - T003/1990 -  - 1991.00007 - DIS