iqd: Dickson seedling quality index

In AgronomiaR/iagro: Indices agronomicos

Description

The iqd function calculates the seedling quality index, according to Dickson's methodology (1960). This variable is widely used to determine the quality of seedlings of forest species

Usage

iqd(MSPA, MSR, MST, HP, DC, trat, save = FALSE)

Arguments

MSPA	Numeric vector with dry shoot weight
MSR	Numeric vector with dry root mass
MST	Numeric vector with total dry mass
HP	Shoot height
DC	Stem diameter
trat	Vector with the names of the treatments with the repetitions

Details

iqd

Author(s)

Gabriel Danilo Shimizu

References

DICKSON, A.; LEAF, A. L.; HOSNER, J. F. Quality appraisal of white spruce and white pine seedling stock in nurseries. For. Chron., v. 36, p. 10-13,1960.

Examples

MSPA=rnorm(100,10,1)
MSR=rnorm(100,10,1)
MST=rnorm(100,10,1)
HP=rnorm(100,10,1)
DC=rnorm(100,10,1)
trat=rep(c("T1","T2","T3","T4"),e=25)
iqd(MSPA,MSR,MST,HP,DC,trat,save=T)

AgronomiaR/iagro documentation built on April 16, 2020, 10:54 p.m.