seedweight.model: The SeedWeight model

In ZeBook: Working with Dynamic Models for Agriculture and Environment

Description

The SeedWeight model is a logistic model of grain weight over time in wheat. The model was proposed by Darroch & Baker (1990) in a study of grain filling in three spring wheat genotypes. This model has a single input variable, degree days after anthesis noted DD, and three parameters, noted W, B and C. Parameters are estimated from observations.

Usage

seedweight.model(DD, W, B, C)

Arguments

DD	: degree days after anthesis
W	: parameter of the model
B	: parameter of the model
C	: parameter of the model

Value

Seed Weight for each TT

Examples

plot(1:500,seedweight.model(1:500, W=30,B=4,C=0.020),type="l",
   xlab="degree days after anthesis", ylab="grain weight")

Example output

ZeBook documentation built on May 1, 2019, 9:48 p.m.