irrigation: Irrigation methods in an agricultural field trial

In faraway: Datasets and Functions for Books by Julian Faraway

Irrigation methods in an agricultural field trial

Description

In an agricultural field trial, the objective was to determine the effects of two crop varieties and four different irrigation methods. Eight fields were available, but only one type of irrigation may be applied to each field. The fields may be divided into two parts with a different variety planted in each half. The whole plot factor is the method of irrigation, which should be randomly assigned to the fields. Within each field, the variety is randomly assigned.

Format

A data frame with 16 observations on the following 4 variables.

field

a factor with levels f1 f2 f3 f4 f5 f6 f7 f8

irrigation

a factor with levels i1 i2 i3 i4

variety

a factor with levels v1 v2

yield

a numeric vector

Source

Found online but source not recorded.

Examples

data(irrigation)
## maybe str(irrigation) ; plot(irrigation) ...

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