Glossary of Table Headings


Yield and Turnout


Yield – Pounds of lint harvested per acre.


Gin Turnout

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.


Percent Lint

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).


Statistical Analysis


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

Source: USDA (1995)


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

Source: USDA (1995)


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

Source: USDA (1995)


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

Source: USDA (1995)

Elongation – The amount that a fiber sample will stretch prior to breakage. This is a measure of the deformation of fiber at rupture expressed as percent change in length based on the original fiber length.


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.

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