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A dataset containing the measurements on 350 birch seedlings.

Usage

birch.df

birch_dw.df

Format

A data.frame object with 350 rows and 8 variables.

A data.frame object with 700 rows and 5 variables.

Details

The data are for seedlings grown in trays with cells or containers of two different volumes. For each of these types of trays, all cells, 1/2 of the cells or 1/4 of the cells contained seedlings. Root-collar diameter (mm), height (cm), dry mass (mg) of stems and roots. Measurements done at the end of the first growing season, after leaf fall.

References

Aphalo, P. J. and Rikala, R. (2003) Field performance of silver-birch planting-stock grown at different spacing and in containers of different volume. New Forests, 25:93-108. doi:10.1023/A:1022618810937 .

See also

Other Plant growth and morphology data: ivy.df

Examples

colnames(birch.df)
#> [1] "Container" "Density"   "block"     "height"    "diameter"  "dwstem"   
#> [7] "dwroot"    "healthy"  
head(birch.df)
#>   Container Density block height diameter dwstem dwroot healthy
#> 1     Small   Dense     1     57     3.90   1965    669       1
#> 2     Small   Dense     1     68     4.13   2356    715       1
#> 3     Small   Dense     1     62     4.52   2476   1127       1
#> 4     Small   Dense     1     39     3.60   1242    417       1
#> 5     Small   Dense     1     74     4.93   1785   1225       1
#> 6     Small   Dense     1     45     3.48   1279    333       1

colnames(birch_dw.df)
#> [1] "Container"  "Density"    "block"      "dry.weight" "Part"      
head(birch_dw.df)
#>   Container Density block dry.weight Part
#> 1     Small   Dense     1       1965 stem
#> 2     Small   Dense     1       2356 stem
#> 3     Small   Dense     1       2476 stem
#> 4     Small   Dense     1       1242 stem
#> 5     Small   Dense     1       1785 stem
#> 6     Small   Dense     1       1279 stem