ca20 {geoR} | R Documentation |
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 tipically 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 fertilizers a while ago and is tipically occupied by rice fields. The third region has recieved fertilizers recently and is frequently used as an experimental area.
data(ca20)
The object ca20
belongs to the class geodata
and is a list
with the following elements:
coords
data
covariate
altitude
area
borders
reg1
reg1
reg1
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. et al. (1997) Caracterização pedológica da fazenda Angra - PESAGRO/RIO - Estação experimental de Campos (RJ). CD-ROM In: Congresso BRASILEIRO de Ciência do Solo 26, Informação, globalização, uso do solo; Rio de Janeiro, 1997. trabalhos. Rio de Janeiro: Embrapa/SBCS, 1997.
Further information on the package geoR can be found at:
http://www.est.ufpr.br/geoR.