climate_by_stages: Summarise the climate variable by growth stages

In weaana: Analysis the Weather Data

Summarise the climate variable by growth stages

Description

Summarise the climate variable by growth stages

Usage

climate_by_stages(
  climates,
  sowing,
  emergence,
  heading = NULL,
  flowering = NULL,
  maturity,
  latitude
)

Arguments

climates	a data.frame for climate records
sowing	date. an vector of sowing date
emergence	numeric (days after sowing). an vector of emergence date
heading	numeric (days after sowing). an vector of heading date (optional. see details)
flowering	numeric (days after sowing). an vector of flowering time (optional. see details)
maturity	numeric (days after sowing). an vector of maturity time
latitude	latitude

Details

Define of growth stages

• S0: From start of year to emergence

• S1: From emergence to flowering time - 300Cd

• S2: From flowering time - 300Cd to flowering time + 100Cd

• S3: From flowering time + 100 Cd to flowering time + 600Cd

• S4: From flowering + 600Cd to maturity

Climate variables

• stage: defination of stages

• n: Number of days in each stage

• avgt: average temperature (C)

• sum.tt: total thermal time (Cd) with base temperature 0C

• avg.mint: average minimum temperature

• avg.maxt: average maximum temperature

• sum.rain: total rainfall

• avg.evap: average evapration

• avg.radn average radiation

• hot.days: number of hot days (daily maximum temperature is more than 30C)

• very.hot.days: number of very hot days (daily maximum temperature is more than 35C)

• frost.days: number of frost days (daily minimum temperature is less than 0C)

• hot.sum: total thermal time above 30C of hot days (daily maximum temperature is more than 30C)

• very.hot.sum: total thermal time above 35C of very hot days (daily maximum temperature is more than 35C)

• frost.sum: total thermal time below 0C of frost days (daily minimum temperature is less than 0C)

• vpd: vapour-pressure deficit

• te: transpiration efficiency

• bio.radn: bio.radn

• bio.water: bio.water

• bio.tt: bio.tt

• ptq: photothermal quotient

• avt.diffuse.radn: average diffuse radiation

Value

a data.frame for summarised climate variable by stages. See details for more information.

Examples

if (FALSE) {
   sowing <- rep(as.Date("1981-05-01"), 10)
   emergence <- rep(10, 10)
   heading <- NULL
   flowering <- runif(10) * 20 + 50
   maturity <- runif(10) * 20 + 100
   latitude <- -27
   res <- climate_by_stages(climates = climates, 
                            sowing = sowing,
                            emergence = emergence, 
                            heading = heading,
                            flowering = flowering,
                            maturity = maturity,
                            latitude = latitude)
}

weaana documentation built on Nov. 5, 2025, 6:08 p.m.