Data/hora: 14/06/2024 06:14:44

Biblioteca(s): | Embrapa Agricultura Digital.
Data corrente: | 28/10/1997
Data da última atualização: | 09/01/2012
Autoria: | SIMOLEN, M. D.; STORM, D. E.; CHEN, Z.; HAAN, C. T.; GREGORY, M. S.; SABBAGH, G. J.
Título: | Targeting critical nonpoint source areas using a GIS-based phosphorus model.
Ano de publicação: | 1993
Fonte/Imprenta: | In: HEATWOLE, C. D. (Ed.). Application of advanced information technologies: effective management of natural resources. St. Joseph, MI: ASAE, 1993.
Páginas: | p. 493-500.
Idioma: | Inglês
Conteúdo: | A phosphorus loading model and geographic information system (GIS) were used to identify critical areas in a watershed where poultry litter is land applied to pastures. The Geographic Resources Analysis Support System (GRASS) is combined with a continuous simulation daily time-step phosphorus loading model to simulate P loading at the watershed outlet. Sensitivity analyses show that the particulate-borne P declines linearly with increasing vegetative cover and logarathimically with distance from field to stream. Increasing clay content in the soil reduces P loading until the soil's adsorptive capacity is saturated. Computer simulations suggest that, in the test watershed, reductions of 17% to 34% in P loading can be achieved by not allowing poultry litter application to 5% to 17% of the available area.
Palavras-Chave: | Bacias hidrográficas; Estrume de aves; Modelagem; Modeling; Sistemas de informação geográfica.
Thesaurus Nal: | Geographic information systems; Poultry manure; Watersheds.
Categoria do assunto: | X Pesquisa, Tecnologia e Engenharia
Registro original: | Embrapa Agricultura Digital (CNPTIA)
Exemplares: | CNPTIA - (5773-1) - ADD - PL - PP - 630.285 - CON - 1997.00026 - DIS