R: Soya bean production and other variables in a uniformity...

soja98 {geoR} | R Documentation

## Soya bean production and other variables in a uniformity trial

### Description

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.

### Usage

    data(soja98)

### Format

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).

### Source

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 químicos do solo em um latossolo roxo distrófico da região de Cascavel-PR. Engenharia Agrícola. Jaboticabal, volume 18, nr. 3, p.80-92.

### Examples

    data(soja98)
    plot(soja98)
    require(geoR)
    prod98 <- as.geodata(soja98, coords.col=1:2, data.col=)
    plot(prod98, low=TRUE)

[Package geoR version 1.7-5.2 Index]