A Study of Colorado Wheat 
129 
General samples— 
composition of crops of 1912 and 1913.19, 20, 21, 22 
composition of, 1914 . 23-24 
mineral constituents of 1912-1913. 25 
Inferiority of crops— 
of 1914 and 1915 attributed to effects of rust. 94 
of 1914 and 1915 not directly attributable to climatic conditions.... 93 
of 1914 and 1915 not due to lack of fertility of soil. 92 
Irrig-ation— 
experiments with Marquis wheat 1914. 104 
does not produce mealiness .^. 45 
Irrigation and rainfall may produce different effects. 46 
Irrigating water, amount of, applied to the soil does not affect the com¬ 
position of wheat .,100-103 
Le Clerc, Dr. J. A., on climatic effects on Colorado wheat. 11 
Manganese— 
Determination of, in wheat . 125 
Determination of, in wheat straw... 126 
Manure— 
effects of, and the application of 1, 2 and 3 feet of irrigating water lO-i 
has no effect on amount of yellow-berry or composition of grain.. 114 
Mealiness due to too high a ratio of potassium to nitrogen in the soil. . 47 
Mealy kernels produced if available nitrogen is too low. Ill 
Mealy or yellow-berry kernels produced by application of potassium.. *39 
Meteorological factors, statement of, for 1913, 1914 and 1915. 13 
Mineral constituents of wheats grown on our plots in 1913. 58 
Nitrates— 
cause a depression of phosphorus . 69 
effects of, on composition of Colorado wheat . 67-68 
nitrate-fertilized plants siisceptible to rust . 69 
Nitrogen— 
deposition of nitrogen and deposition of starch takes place simul¬ 
taneously . 98 
effects of, applied as nitrate of soda on growth of plant and char¬ 
acter of kernels produced . 8 
effects of, on growth of plant and character of kernels. 8 
low content of plants in 1915 due to leaching or to impaired tran¬ 
spiration .,. 96 
not transferred from plant to head in 1915 as in 1913 at period of 
ripening. 97 
rapidly transferred from plant to head in 1913 during five days. ... 95 
variation in total greater than amount of nitric nitrogen necessary 
to determine character of wheat produced. 3 
wastage of nitrogen .,. 4 
Nitric nitrogen— 
amount necessary to change growth and character of plant and 
composition of grain . 3 
in cropped and fallow land . 6 
increases nitrogen content and produces flinty kernels. 116 
variation of, in soil effects mealiness or starchiness of crop ,. 112 
Object of bulletin stated .,. 10 
Observed effects of the fertilizers applied... 72 
Our shrunken wheat not higher in nitrogen or lower in starch than 
plump wheat . 95 
Phosphorus— * 
cannot be determined in either wheat or wheat-straw by ignition. . . 61 
determination of, in wheat . 125 
* 
determination of, in wheat straw .. 126 
effects of, on growth of plants and character of kernels. 8 
volatilization of . 123 
Plant foods, effects of, under our conditions.. . 110 
