. Bulletin of the Department of Agriculture. Agriculture; Agriculture. UNITED STATES DEPARTMENT OF AGRICULTURE. BULLETIN No. 644 Contribution from the Bureau of Plant Industry WM. A. TAYLOR, Chief Washington, D. C. PROFESSIONAL PAPER January 18, 1918 LINT PERCENTAGE AND LINT INDEX OF COT TON AND METHODS OF DETERMINATION. By G. S. Meloy, Assistant, Crop Acclimatisation and Cotton Breeding. CONTENTS. Pace. Relation of lintpercentagesto lintindexes 1 Lint percentages 2 Lint indexes 2 Illustrations of the relation between lint per- centage and lint index 3 Lint index determines the number cf
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. UNITED STATES DEPARTMENT OF AGRICULTURE. BULLETIN No. 644 Contribution from the Bureau of Plant Industry WM. A. TAYLOR, Chief Washington, D. C. PROFESSIONAL PAPER January 18, 1918 LINT PERCENTAGE AND LINT INDEX OF COT TON AND METHODS OF DETERMINATION. By G. S. Meloy, Assistant, Crop Acclimatisation and Cotton Breeding. CONTENTS. Pace. Relation of lintpercentagesto lintindexes 1 Lint percentages 2 Lint indexes 2 Illustrations of the relation between lint per- centage and lint index 3 Lint index determines the number cf bells to the pound of fiber 5 Relation of the lint index to the cost cf pick- ing 5 Increasing the lint percentage dees net alter the cost of production if the lint index re- mains constant 8 Page. Improved methods for obtaining lint per- centages s Advantages of using samples cf standard wei~ht 10 Methods of calculating lint indexes and seed weights 10 Number of seeds in a standard sample an in- dication of their sice 10 Planters can estimate the lint index 11 Summary 11 RELATION OF LINT PERCENTAGES TO LINT INDEXES. The danger of reducing the vitality and earliness of cotton vari- eties and of breeding varieties with undesirable characters by over- emphasizing the percentage of lint as a measure of their compara- tive values was pointed out in 1908 by Mr. O. F. It was sug- gested that the weight of the lint or fiber ginned from 100 seeds, in- stead of the lint percentage alone, be used as an additional standard for judging varieties. This standard of comparison was called the- lint index. Subsequent experience has not only demonstrated the desirability of using this standard, but has led to the development of improved methods and devices for determining both the lint index and the lint percentage in experimental samples of seed cotton with which breeders have to work. xCook, O. F. Danger in judging cotton varieties by lint percentages. Bur. Plant Indus. Cir. 11, 16 p. 1
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