A Study oi' Couorado Wheat 
17 
An inspection of these data shows some interesting tilings, es¬ 
pecially when taken in connection with the weather conditions. Our 
table on a previous page shows that we had a rainfall of^ 2.63 inches 
during July of 1913, 0.8 of an inch fell on the i8th, and 1.19 inches on 
the 23rd, which was cloudy all day, otherwise the sky was practically 
clear during the month and also during August. The yield of the 
Defiance was a trifle better than that of the other varieties. Its weight 
])er bushel being between 60 and 63 pounds, and thd maximum ratio 
of straw to grain was 1.57. It was surpassed in weight per bushel, 
hut in no other respect by the other varieties. In 1914 we had an 
excellent season, with onl}^ 1.68 inches of rainfall in July. We had 
a shower on 30 July, during which, 0.87 of an inch of rain fell. This 
shower was violent and beat down the grain somewhat, especially the 
Defiance, which was luxuriant and growing rapidly. Rust developed 
and the grain ripened prematurely. The minimum yield of Defiance 
fell almost 30 bushels per acre below the maximum for the Fife. Only 
one plot in the twelve yielded grain weighing 60 pounds per bushel and 
ona plot yielded grain weighing only 52 pounds, while the minimum 
for the other two varieties was 63 and the maximum 65.5 pounds per 
bushel. The maximum yield of Defiance was 39.16 and the minimum 
25.70 bushels. The maximum yield of the other two varieties was 
55.5 and the minimum 43.00 bushels per acre. 
The Red Fife and the Kubanka are a little earlier and, perhaps, 
a little more resistant to rust than the Defiance. These seem to have 
been the determining factors in this year’s crops. In 1915 we did not 
have so much rain in July as in 1913 but the two seasons were quite 
different; 1915 was much more cloudy; we had a succession of light 
rains and the dews were heavy. Rust was bad on all varieties and the 
Defiance was practically a failure. The biggest yield was 26.8 bushels, 
weight 53 pounds, the minimum 8.33 bushels, weight 47 pounds. The 
Red Fife grown with the application of sodic nitrate rusted very badly 
and yielded only about 24 bushels, weighing 56 pound.s to the bushel. 
Most of the other plots yielded from 30 to 40 bushels, weighing from 
60 to 63 pounds per bushel. 
THE FACTORS WHICH DETERMINED OUR CROPS 
The factors which determined our crops were evidently not the 
tpiantity of rainfall but its distribution, the degree of cloudiness, the 
resistance o£ the plant to rust, its stage of development when: this at¬ 
tack came, the temperature, and the fertility of the soil. The plants 
grown with the application of nitrates were attacked more severely by 
