rice {asreml} | R Documentation

## Rice bloodworms.

### Description

An investigation of the tolerance of rice varieties to attack by the larvae of bloodworms.

### Usage

    rice

### Format

A data frame with 6 columns and 264 rows:

Pair

  A factor with 132 levels

rootwt

  Root weight

Run

  A factor with 66 levels

sqrtroot

  The square root of `rootwt`

Tmt

  A factor with 2 levels

Variety

  A factor with 44 levels

### Details

The experiment commenced with the transplanting of rice seedlings into trays. Each tray contained a total of 32 seedlings and the trays were paired so that a control tray (no bloodworms) and a treated tray (bloodworms added) were grown in a controlled environment room for the duration of the experiment. After this, rice plants were carefully extracted, the root system washed and root area determined for the tray using an image analysis system. Two pairs of trays, each pair corresponding to a different variety, were included in each run. A new batch of bloodworm larvae was used for each run. A total of 44 varieties was investigated with three replicates of each. The variety concurrence was such that: eight varieties occurred with only one other variety, 22 with two other varieties and the remaining 14 with three different varieties.

### References

Stevens MM, Fox KM, Warren GN, Cullis BR, Coombes NE, Lewin LG (1999). “An Image Analysis Technique for Assessing Resistance in Rice Cultivars to Root-feeding Chironomid Midge Larvae (Diptera: Chironomidae).” Field Crops Research, 66, 25–26.

[Package asreml version 4.1.0.176 Index]