Development of pre-harvest cotton fiber quality prediction equations

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Title: Development of pre-harvest cotton fiber quality prediction equations
Author: Warrick, Billy Eugene
Abstract: Cotton (Gossypium hirsutum L . ) , the major crop of the Southern High Plains of Texas , serves as a major source of income in several counties of the South Plains . Pre -harvest knowledge of fiber properties is valuable to buyers , sellers , and processors of cotton . The current pre -harvest sampling technique requires considerable time , effort , and resources . This research was conducted to determine the feasibility of predicting cotton fiber length , micronaire , and strength before harvest , with regression equations based on climatic variables under both dryland and irrigated production . This study utilized the developed equations to predict fiber properties of the 1982 through 1987 Southern High Plains cotton crops and to determine their accuracy in estimating overall crop quality . Multiple -regression analysis of fiber quality properties and weather variables (solar radiation , heat units , rainfall , and rainfall plus irrigation ) were used to develop these equations . Cotton fiber quality data were obtained from the High Plains Research Foundation at Halfway and the Texas Agricultural Research and Extension Center at Lubbock from 1982 through 1987 . The predictive equations developed included : fiber length , micronaire , and strength under irrigated production with R values of .66 , .59 , and .51 , respectively . Also , fiber length , micronaire , and strength under dryland production with R^ values of .76 , -59 , and .19 , respectively . Irrigated production refers to crop development utilizing seasonal rainfall plus two irrigations (pre -plant plus one during the growing season ) . Dryland production refers to crop development utilizing seasonal rainfall only . Fiber quality predictions as compared to the actual USDA Cotton Classing Office averages varied by -0 .42 to +1 .79 32nds of an inch for fiber length , -0 .10 to +0 .27 for micronaire and -0 .50 to +1 .63 gram per tex for strength for the years 1982 through 1987 . Predictions made by these equations were not consistent enough to be used for making marketing decisions . Additional field studies are needed to improve the predictive capabilities of these models .
URI: http : / /hdl .handle .net /2346 /19689
Date: 1989-05

Citation

Development of pre-harvest cotton fiber quality prediction equations. Doctoral dissertation, Texas Tech University. Available electronically from http : / /hdl .handle .net /2346 /19689 .

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