Data/hora: 17/06/2024 03:48:19

Biblioteca(s): | Embrapa Mandioca e Fruticultura.
Data corrente: | 28/12/1999
Data da última atualização: | 28/12/1999
Autoria: | EHLERS, W.
Afiliação: | Institut fur Pflanzenbau und Pflanzenzuchtung, Univ. of Gotingen, West Germany.
Título: | Rapid determination of unsaturated hydraulic conductivity in tilled and untilled loess soil.
Ano de publicação: | 1976
Fonte/Imprenta: | Soil Science Amer. Proceeding v.40, n.6, p.837-840, 1976.
Idioma: | Inglês
Conteúdo: | A rapid method recently developed for determining moisture diffusivity and unsaturated hydraulic conductivity in undisturbed soil cores was employed to calculate the hydraulic functions of the upper layers of tilled and untilled loess soil. The results obtained with the new method compare well with results obtained by a field metod.Dif fusivity functions as influenced by tillage and depth were significantly different. Coductivities were highest in the 20-30-cm layer of untilled soil and were lowest in the same layer of tilled soil. The number of replicates necessary to evaluate the hydraulic functions with arbitrarily specified precision was calculated. For the soil under study, five to nine samples are needed, when upper and lower limits of the 95% confidence interval of diffusity means are defined not to be different more that by a factor of three.
Palavras-Chave: | Number of replicates; Zerotillage.
Thesagro: | Evaporação; Porosidade.
Thesaurus Nal: | diffusivity; evaporation; porosity.
Categoria do assunto: | --
Registro original: | Embrapa Mandioca e Fruticultura (CNPMF)
Exemplares: | CNPMF - (17522-1) - ADD - SP - -- - S1217 -  - S1217 - DIS