agridat (version 1.23)

williams.trees: Multi-environment trial of trees, height / survival of 37 species at 6 sites in Thailand

Description

Multi-environment trial of trees, height / survival of 37 species at 6 sites in Thailand

Format

A data frame with 222 observations on the following 4 variables.

env

Environment factor, 6 levels

gen

Genetic factor, 37 levels

height

Height (cm)

survival

Survival percentage

Details

Planted in 1985 at six sites in Thailand. RCB with 3 reps. The data here is the mean of the three reps. Plots were 5 meters square with spacing 2m x 2m. Measurements collected at 24 months. The gen column in the data is actually seedlot, as some tree species have multiple seed lots. The trees are mostly acacia and eucalyptus.

Used with permission of Emlyn Williams.

References

E. R. Williams and A. C. Matheson and C. E Harwood, Experimental Design and Analysis for Tree Improvement. CSIRO Publishing, 2002.

Examples

if (FALSE) {

library(agridat)
data(williams.trees)
dat <- williams.trees

libs(lattice)
xyplot(survival~height|env,dat, main="williams.trees", xlab="Height",
ylab="Percent surviving")
}