Data/hora: 09/06/2024 12:16:43

Biblioteca(s): | Embrapa Mandioca e Fruticultura.
Data corrente: | 13/09/1995
Data da última atualização: | 13/09/1995
Autoria: | VAN NOORDWIJK, M.; FLORIS, J.; JAGER, A.
Afiliação: | Institute for Soil Fertility, P.O, Box 30003, 9750 RA Haren (Gr), Netherlands.
Título: | Sampling schemes for estimating root density distribution in cropped fields.
Ano de publicação: | 1985
Fonte/Imprenta: | Netherlands Journal of Agricultural Science, v.33, p.241-262, 1985.
Idioma: | Inglês
Conteúdo: | In discussions on root reseach methods, so far the choice of sampling schemes seems to have been a neglected topic. In this paper sampling schemes are discussed for various situations. It is shown that the schemes used traditionally for row crops such as cereals  may give a bias of about 30% in total root dry weight. More reliable sampling schemes are presented, as well as possibilities for correction of data from traditional sampling. Available  data on variation in root mass per auger sample are summarized to calculate the number of replicate samples required to detect differences (of given magnitude) between two means. The coefficient of variation of root weight per auger sample seems to be fairly constant at around 40% in grassland, with slightly higher values for deeper layers of soil. A method is described by which slices of a root system, obtained by the pinboard  method, can be used to estimate the total size of the roots system of a single plant. As and example results are discussed for a potato experiment. A related technique is presented for calculations on profile wall observations.
Palavras-Chave: | Auger; Cereals; Grassland; Pinboard; Potato; Profile wall counts; Root research methods; Shoot:root ratio; Sugar-beet.
Thesaurus Nal: | bias.
Categoria do assunto: | --
Registro original: | Embrapa Mandioca e Fruticultura (CNPMF)
Exemplares: | CNPMF - (16085-1) - ADC - SP - -- - S9839 -  - S9839 - DIS