136 Colorado Experiment Station 
Pottasium— 
effects of, on growth of plants and character of kernels. 8 
increases the proportion of plump kernels. 41 
T’revious work with Colorado wheats., .. 10 
Protein— 
content not affected by amount of irrigating water applied. 103 
depression of, in crops of 1914 and 1915 not accompanied by corres¬ 
ponding increase of starch . 91 
large kernels as rich or richer in protein than the small kernels.. 85 
ratio of, to starch....... 44 
why content is considered most significant in this study. 109 
Rains and heavy dews—Frequent light rains and heavy dews produce 
different effects than are produced by irrigating water. 119 
Rainfall, time and manner of, more important than quantity. 72 
Resxilts of experiments in, 1913 and 1914 to ascertain effects of irrigat¬ 
ing water applied .. v. 107 
Richardson, Clifford, attributed quality of Colorado wheat to character 
of soil ., .. 10 
Rust— 
conditions that developed in 1914 and 1915. 75 
effects of, on yield and weight per bushel. 17 
effect of, in 1914, important. 72 
increased ratio of straw to grain .,. 53 
prevents transfer of nitrogen from plant to kernels. 98 
Schindler, on the effects of Colorado’s climatic conditions. 11 
Shrunken kernels not necessarily high in protein..... 84 
Sulfur— 
determination of, in wheat... 125 
determination of, in wheat straw. . 126 
Summary . 120 
Water, application of, a physiological problem. 7 
Water and manure affect volume of crop but not the composition. 108 
What the experiments of 1913 show. 59 
Wet weather injures wheat by washing out the nitrates. Laws and Gil¬ 
bert .-. 22 
Wheats grown and cultural methods used .. • • • .. 52 
Wheat plant does not destroy nitrifying power of soil. 6 
Wiley, Dr. H. W., effect of soil on composition of grain. 10 
Yellow-berry— 
Yellow-berry. 
attributed to climate . .' ’ 3 ^^ 
attributed by Le Clerc to rainfall or to irrigation. 37 
causes assigned for . 30 
prevalence of, not affected by manure applied . IO 5 
prevalence of, not affected by amount of water applied.. 105 
Yields— 
weight per bushel and ratio of straw to wheat, 1913. 14 
weight per bushel and ratio of straw to wheat, 1914.I 5 
weight per bushel and ratio of straw to wheat, 1915. 1 ^; 
Yield and character of crops, difference in not due to exhaustion of soil 73 
INDEX TO TABLES 
Analyses— 
of General Samples of Spring-Wheats—Crops of 1912 and 1913. 19, 20 
of General Samples Winter-Wheat—Crops 1912 and 1913.. 21 22 
of General Samples for 1914 (Spring-Wheats and Winter-Wheats) . 23* 24 
of Yellow-Berry and Flinty Kernels Grown Under Identical Condil 
tions . 
. 42 
Ash Constituents— 
of Wheat—Crop 1914 
79 
