GLOSSARY OF TABLE HEADINGS
Yield and Turnout
Yield – Pounds of lint harvested per acre.
Lint – Percentage of lint of the stripper-harvested cotton.
Seed – Percentage of seed of the stripper-harvested cotton.
Agronomic Properties – Determined from hand-snapped samples.
Picked – Lint fraction of seed cotton.
Pulled – Lint fraction of burr cotton.
Boll Size – Weight, in grams, of seed cotton per boll.
Seed Index – Weight, in grams, of 100 fuzzy seed.
Lint Index – Weight, in grams, of lint from 100 seed (calculated).
Seed Per Boll – Average number of seed per boll (calculated).
Maturity and Storm Resistance
Percent Open Bolls – Percentage of open bolls on a given date.
Storm Resistance – Visual rating from 1 (very loose boll type, considerable seed cotton loss) to 5 (very tight boll types, no seed cotton loss).
Mean – The average value for the trait being observed.
C.V.,% – Coefficient of variation. A statistical measure of the variability within a test, and expressed as percentage.
LSD – Least significant difference. If the difference between two means exceed this value, the two means are significantly different at the 0.05 probability level.
Fiber Properties – Measured by High Volume Instrument (HVI)
Micronaire – A relative measure of fiber linear density (mass per unit length) determined by air permeability.
|Market Value||HVI Micronaire|
|Discount range||3.4 and below|
|Base range||3.5 – 3.6|
|Premium range||3.7 – 4.2|
|Base range||4.3 – 4.9|
|Discount range||5.0 and above|
Length – An instrument measure of fiber length, expressed in hundredths of a inch, which approximates the classer’s staple length.
|Staple 32nds||HVI Length|
|30||.93 – .95|
|31||.96 – .98|
|32||.99 – 1.01|
|33||1.02 – 1.04|
|34||1.05 – 1.07|
|35||1.08 – 1.10|
|36||1.11 – 1.13|
|37||1.14 – 1.17|
|38||1.18 – 1.20|
Uniformity – A measure of the uniformity of fiber length in a sample, expressed as a percentage.
|Uniformity group||HVI Uniformity|
|Very high||86 and above|
|High||83 – 85|
|Intermediate||80 – 82|
|Low||77 – 79|
|Very Low||76 and below|
Strength – The force required to rupture (or break) a fiber sample, expressed in grams per tex.
|Strength group||HVI Strength|
|Very strong||31 and above|
|Strong||29 – 30|
|Intermediate||26 – 28|
|Weak||24 – 25|
|Very weak||23 and below|
Leaf Grade – The percentage of the fiber sample area covered by non-fiber materials, as determined by a video scanner. The percentage is converted to units from one through eight and the higher values indicate more foreign material.
Rd – Degree of reflectance. This measures how light or dark the fiber sample is, expressed as a percentage. Lower Rd values indicate a grayer sample.
+b – Yellowness. This measures the degree of color pigmentation. Higher +b value indicate yellower samples.
Color Grade – A function of the Rd and +b of the fiber sample. The color grade indicates the quadrant of the Nickerson-Hunter cotton colorimeter diagram in which Rd and +b values intersect.
See Exhibit A on page 10.
Percent Root Necrosis – This is the percentage of the root system that is diseased.