srppp (version 2.0.2)

application_rate_g_per_ha: Calculate application rates for active ingredients

Description

An application rate in g active substance/ha is calculated from information on dosage (product concentration in the application solution) and application volume, or directly from the product application rate. This is complicated by the fact that a rate ("expenditure" in the XML file) with units l/ha can refer to the application solution or to the liquid product.

Usage

application_rate_g_per_ha(
  product_uses,
  aggregation = c("max", "mean", "min"),
  dosage_units = c("percent_ww", "percent_vv", "state_of_matter"),
  skip_l_per_ha_without_g_per_L = TRUE,
  fix_l_per_ha = TRUE
)

Value

A tibble containing one additional column 'rate_g_per_ha'

Arguments

product_uses

A tibble containing the columns 'pNbr', 'use_nr', 'application_area_de', 'min_dosage', 'max_dosage', 'min_rate', 'max_rate', from the 'uses' table in a srppp_dm object, as well as the columns 'percent' and 'g_per_L' from the 'ingredients' table in a srppp_dm object.

aggregation

How to represent a range if present, e.g. "max" (default) or "mean".

dosage_units

If no units are given, or units are "%", then the applied amount in g/ha is calculated using a reference application volume and the dosage. As the dosage units are not explicitly given, we can specify our assumptions about these using this argument (currently not implemented, i.e. specifying the argument has no effect).

skip_l_per_ha_without_g_per_L

Per default, uses where the use rate has units of l/ha are skipped, if there is not product concentration in g/L. This was also done in the 2023 indicator project.

fix_l_per_ha

During the review of the 2023 indicator project calculations, a number of cases were identified where the unit l/ha specifies a water volume, and not a product volume. If TRUE (default), these cases are corrected, if FALSE, these cases are discarded.

Details

In some cases (currently one), external information was found, indicating that the "expenditure" is an application volume l_per_ha_is_water_volume.

Examples

# \donttest{
library(srppp)
library(dplyr, warn.conflicts = FALSE)
library(dm, warn.conflicts = FALSE)

sr <- try(srppp_dm())

# Fall back to internal test data if downloading or reading fails
if (inherits(sr, "try-error")) {
  sr <- system.file("testdata/Daten_Pflanzenschutzmittelverzeichnis_2024-12-16.zip",
      package = "srppp") |>
    srppp_xml_get_from_path(from = "2024-12-16") |>
    srppp_dm()
}

product_uses_with_ingredients <- sr$substances |>
  filter(substance_de %in% c("Halauxifen-methyl", "Kupfer (als Kalkpr\u00E4parat)")) |>
  left_join(sr$ingredients, by = "pk") |>
  left_join(sr$uses, by = "pNbr") |>
  left_join(sr$products, by = "pNbr") |>
  select(pNbr, name, use_nr,
    min_dosage, max_dosage, min_rate, max_rate, units_de,
    application_area_de,
    substance_de, percent, g_per_L)

application_rate_g_per_ha(product_uses_with_ingredients) |>
  filter(name %in% c("Cerelex", "Pixxaro EC", "Bordeaux S")) |>
  select(ai = substance_de, app_area = application_area_de,
    min_d = min_dosage,  max_d = max_dosage,
    min_r = min_rate, max_r = max_rate,
    units_de, rate = rate_g_per_ha) |>
  print(n = Inf)
# }