38 The Colorado Experiment Station 
Yellow-berry should not be mistaken for or confused with 
black-ended berries or with brown or other discolorations in the 
berries. These affections are not general affections as the yellow- 
berry is and are not produced by the same cause. 
Yellow-berry is under the control of the grower. If there be 
sufficient difference in the price of grain produced he can control it 
with a margin of profit. 
The means at his disposal for its control are: 
First: The judicious use of sodic nitrate. 
Second: The thorough cultivation of his soil with the appli¬ 
cation of nitrogenous manures. 
Third: A rotation of crops in which a clover and possibly 
other legumes precede the wheat. 
Fourth: Fallow cultivation. 
These observations apply to all of our western soils, rich in 
potassium and relatively, not absolutely, poor in available nitrogen. 
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