ca20: Calcium content in soil samples

Description

This data set contains the calcium content measured in soil samples taken from the 0-20cm layer at 178 locations within a certain study area divided in three sub-areas. The elevation at each location was also recorded.

The first region is typically flooded during the rain season and not used as an experimental area. The calcium levels would represent the natural content in the region. The second region has received fertilisers a while ago and is typically occupied by rice fields. The third region has received fertilisers recently and is frequently used as an experimental area.

Usage

data(ca20)

Arguments

encoding

latin1

source

The data was collected by researchers from PESAGRO and EMBRAPA-Solos, Rio de Janeiro, Brasil and provided by Dra. Maria Cristina Neves de Oliveira.

Capeche, C.L.; Macedo, J.R.; Manzatto, H.R.H.; Silva, E.F. (1997) Caracteriza��o pedol�gica da fazenda Angra - PESAGRO/RIO - Esta��o experimental de Campos (RJ). (compact disc). In: Congresso BRASILEIRO de Ci�ncia do Solo. 26., Informa��o, globaliza��o, uso do solo; Rio de Janeiro, 1997. trabalhos. Rio de Janeiro: Embrapa/SBCS.

References

Oliveira, M.C.N. (2003) M�todos de estima��o de par�metros em modelos geoestat�sticos com diferentes estruturas de covari�ncias: uma aplica��o ao teor de c�lcio no solo. Tese de Doutorado, ESALQ/USP/Brasil. Further information on the package geoR can be found at: http://www.leg.ufpr.br/geoR.