Characterization descriptors for maize used at the Genetic Resources Research Institute (GeRRI) - Kenya. These descriptors are based on IBPGR descriptors for maize (1991).
Visual measurement recorded three weeks after emergence of the seedling.
Number of days from planting to when 50% of the plants have extended silk.
Midrib colour of the third leaf counted from flag leaf downwards taken during or shortly after flowering.
Mean height of 10 random plants, measured from the ground level to the tip of the head taken after flowering and before ripening.
Mean height of 10 random plant ears from the ground level to the node bearing the upper ear.
Absence or prescence of pigments on leaf and stalk taken at seed filling stage.
Average number of basal tillers (without counting the stem)at maturity of 10 randomly selected plants.
Susceptibility to lodging. Scored before harvesting in a scale similar to percentages.
Number of days from sowing to 90% of plants reaching physiological maturity.
Average of 10 randomly selected plants from the middle of the plot.
Consider phenotypic appearance.
Number of ears randomly harvested and characterized in the lab.
Mean length of 10 random ears from the point of attachment on the ear peducle to the tip of the dehusked ear.
Number of rows of kernel on 10 randomly selected ears.
Three colours observed in order of frequency.
Visual measurement whether the kernel colours are the same or not.
Visual measurement of the endosperm colour.
Visual measurement looking at longitudinal cut seed.
Weight of one thousand seeds adjusted to 10% moisture content.