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.