A dataset containing the measurements on 350 birch seedlings.
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