Description Usage Format Source Examples
Data on soya bean production in a uniformity trial measured at plots of size 5x5 meters and other soil properties measured in points given by the data coordinates.
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A data frame with 256 observations on the following 10 variables.
X
a numeric vector with X-coordinates of the plot centres.
Y
a numeric vector with X-coordinates of the plot centres.
P
a numeric vector, phosphorous content.
PH
a numeric vector, soil pH.
K
a numeric vector, potassium content. (Cmol/dm^3)
MO
a numeric vector, organic matter. (percentage)
SB
a numeric vector, basis saturation.
iCone
a numeric vector, cone index, measuring mechanic resistence of the soil. (kg/cm^2)
Rend
a numeric vector, total soya production within the plot (kg).
PROD
a numeric vector, production converted to productivity by a unit of area - hectare (ton/ha).
Souza, E.G.; Jojann, J. A.; Rocha, J. V.; Ribeiro, S. R. A.; Silva, M. S., Upazo, M. A. U.; Molin, J. P.; Oliveira, E. F.; Nóbrega, L. H. P. (1999) Variabilidade espacial dos atributos quÃmicos do solo em um latossolo roxo distrófico da região de Cascavel-PR. Engenharia AgrÃcola. Jaboticabal, volume 18, nr. 3, p.80-92.
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