atsum: Accumulated Thermal Sum

In EstimateBreed: Estimation of Environmental Variables and Genetic Parameters

Accumulated Thermal Sum

Description

Calculates the daily and accumulated thermal sum, considering the subtraction of the average air temperature by the lower cardinal temperature for each crop.

Usage

atsum(AAT, crop = "maize", lbt = NULL, verbose = FALSE, plot = FALSE)

Arguments

AAT	The column with the average air temperature values.
crop	Parameter to define the culture. Use 'maize' for maize, 'soybean' for soybean, 'flax' for flaxseed, 'trit' for wheat or 'oat' for oat crop.
lbt	Parameter to define the value of the lower basal temperature to be used in the calculation. If not informed, the function will use the values of 10, 5, 2, 2 and 0 ^{\circ}C for maize, soybeans, flaxseed, wheat and oats, respectively.
verbose	Logical argument. Runs the code silently if FALSE.
plot	Logical argument. Plot a graph of thermal accumulation if TRUE.

Value

Returns the cumulative and total thermal sum considering the cultivation cycle of the selected crop. Also presents the following parameters:

* Total Cycle
The number of cycle days, for verification.

* TS
The value of the total thermal sum, in daily degree days (GDD).

* TBi
The value used for the lower base temperature.

* General Parameters
Considering the reported average air temperature values, it returns the maximum, minimum, and coefficient of variation.

Author(s)

Willyan Junior Adorian Bandeira

Ivan Ricardo Carvalho

Murilo Vieira Loro

Leonardo Cesar Pradebon

Jose Antonio Gonzalez da Silva

Examples

library(EstimateBreed)

data("clima")
clima <- get("clima")[1:150, ]

with(clima,atsum(TMED,crop="maize"))

#Adjusting lower basal temperature manually
with(clima,atsum(TMED,crop="maize",lbt=12))

EstimateBreed documentation built on April 4, 2025, 5:37 a.m.