agridat (version 1.23)

ars.earlywhitecorn96: Multi-environment trial of early white food corn

Description

Multi-environment trial of early white food corn for 60 white hybrids.

Format

A data frame with 540 observations on the following 9 variables.

loc

location, 9 levels

gen

gen, 60 levels

yield

yield, bu/ac

stand

stand, percent

rootlodge

root lodging, percent

stalklodge

stalk lodging, percent

earht

ear height, inches

flower

days to flower

moisture

moisture, percent

Details

Data are the average of 3 replications.

Yields were measured for each plot and converted to bushels / acre and adjusted to 15.5 percent moisture.

Stand is expressed as a percentage of the optimum plant stand.

Lodging is expressed as a percentage of the total plants for each hybrid.

Ear height was measured from soil level to the top ear leaf collar. Heights are expressed in inches.

Days to flowering is the number of days from planting to mid-tassel or mid-silk.

Moisture of the grain was measured at harvest.

Examples

if (FALSE) {
  
  library(agridat)
  
  data(ars.earlywhitecorn96)
  dat <- ars.earlywhitecorn96

  libs(lattice)
  # These views emphasize differences between locations
  dotplot(gen~yield, dat, group=loc, auto.key=list(columns=3),
          main="ars.earlywhitecorn96")
  ## dotplot(gen~stalklodge, dat, group=loc, auto.key=list(columns=3),
  ##         main="ars.earlywhitecorn96")
  splom(~dat[,3:9], group=dat$loc, auto.key=list(columns=3),
        main="ars.earlywhitecorn96")
  
  # MANOVA
  m1 <- manova(cbind(yield,earht,moisture) ~ gen + loc, dat)
  m1
  summary(m1)
  
}