A Study of Colorado Wheat 
I 2 I 
nutrient and also because of the softness characteristic of such plants, 
which is probably due to the weakness of the cell walls themselves- 
That organic nitrogen in farmyard manure does not produce these 
results, except in the measure that it is converted into nitric-nitrogen, 
the rate of which process depends upon the nitrifying efficiency of 
the individual soil. 
That our results do not show that potassium has increased the 
starch; neither do they show that it has had any positive effect on the 
quantity of this substance formed. 
That potassium has a tendency to suppress the nitrogen content 
of the berry. 
That potassium suppresses the nitrogen in the plant throughout 
its growing period, particularly in the stems and leaves, but does not 
appear to suppress it in the head. 
That potassium, under our conditions, produces an effect upon the 
development of the plant as shown by the larger size of the plants at a 
certain stage of development, but the plants on the other plots attain 
the same degree of development a few days later, eliminating this 
difference. 
That potassium increases the condition designated as yellow-berry. 
That phosphorus under our conditions has produced so little ef¬ 
fect that no interpretation is possible. 
That the phosphorus in the berry is depressed by nitric-nitrogen 
but is not affected by potassium. 
That manganese is uniformly present. 
That the amount of water applied as irrigating water may in¬ 
crease the crop, but has so good as no effect upon the composition of 
the crop produced. 
That the leaching effect of irrigating water on the nitrates in the 
soil is not sufficient tO' affect the nitrogen content of our wheat, if 
first applied when the plants are two months old, or two months after 
the application of the nitrates- 
That frequent light rains, when associated with heavy dews, pro¬ 
duce different effects on the plant from those produced by irrigating 
water applied to the soil. 
That the time of the rainfall and the weather conditions succeed¬ 
ing, are the most important factors in determining the effects of rain 
upon the wheat. 
That the importance of these conditions is an indirect, rather than 
a direct one, depending upon the development of rust or its failure to 
develop. 
That there is a period just before the maturing of the plant, when, 
under favorable conditions, the plant transfers its substance to the 
berries. 
