The SeedWeight model

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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

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  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

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

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