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Indicative crop thermal parameters

Source: R/seasons.R
crop_parameters.Rd

Base and upper temperatures, and cumulative growing degree days at the end of each phenological stage, for a small set of crops.

Usage

crop_parameters(crop = NULL)

Arguments

crop

Optional crop name. When NULL, all crops are returned.

Value

A data frame with columns crop, t_base, t_upper, stage and gdd_end, ordered by crop and cumulative thermal time.

Calibrate before trusting

These values are indicative defaults for getting started, not calibrated constants. Thermal requirements vary substantially with cultivar, photoperiod and region, and a stage boundary that is wrong by a fortnight will misattribute the weather a model sees. Supply your own thresholds through the stages argument of phenology_windows() for any analysis you intend to publish.

See also

growing_degree_days(), phenology_windows()

Examples

crop_parameters("wheat")
#>    crop t_base t_upper           stage gdd_end
#> 1 wheat      0      30       emergence     150
#> 2 wheat      0      30       tillering     500
#> 3 wheat      0      30 stem_elongation     900
#> 4 wheat      0      30        anthesis    1300
#> 5 wheat      0      30      grain_fill    1900
#> 6 wheat      0      30        maturity    2200
unique(crop_parameters()$crop)
#> [1] "wheat"   "maize"   "rice"    "soybean" "canola"  "generic"