agridat: Agricultural Datasets

williams.trees

R Documentation

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.

Source

Williams, ER and Luangviriyasaeng, V. 1989. Statistical analysis of tree species trial and seedlot:site interaction in Thailand. Chapter 14 of Trees for the Tropics: Growing Australian Multipurpose Trees and Shrubs in Developing Countries. Pages 145–152. https://aciar.gov.au/publication/MN010

References

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

Examples

## Not run: 

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

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

## End(Not run)

kwstat/agridat documentation built on Dec. 17, 2024, 3:56 p.m.