tai.potato {agridat} | R Documentation

## Multi-environment trial of potato

### Description

Multi-environment trial of potato tuber yields

### Usage

    data("tai.potato")

### Format

A data frame with 48 observations on the following 6 variables.

`yield`

  yield, kg/plot

`gen`

  genotype code

`variety`

  variety name

`env`

  environment code

`loc`

  location

`year`

  year

### Details

Mean tuber yield of 8 genotypes in 3 locations over two years. Katahdin and Sebago are check varieties. Each location was planted as a 4-rep RCB design.

In Tai's plot of the stability parameters, F5751 and Sebago were in the average stability area. The highest yielding genotype F6032 had an unstable performance.

### Source

G.C.C. Tai, 1971. Genotypic stability analysis and its application to potato regional trials. Crop Sci 11, 184-190. Table 2, p. 187. http://doi.org/10.2135/cropsci1971.0011183X001100020006x

### References

George Fernandez (1991). Analysis of Genotype x Environment Interaction by Stability Estimates. Hort Science, 26, 947-950.

### Examples

    data(tai.potato)
    dat = tai.potato

    require(lattice)
    dotplot(variety ~ yield|env, dat, main="tai.potato")

    # fixme - need to add tai() example

    # note, st4gi::tai assumes there are replications in the data
    # https://github.com/reyzaguirre/st4gi/blob/master/R/tai.R

[Package agridat version 1.16 Index]