Colorado Experiment Station. 
16 
Results for Potash Differ from those in Humid Climates. 
In discussing the potash in the ten-ton lot of sheep manure, it 
was pointed out that there was no loss of potash during the first year 
although the manure lost 32 percent in weight in that time. The 
determinations given in Table II corroborate the fact that the 
potash accumulated during the first year and are repeated below in 
order that this fact may be clearly seen. 
Percent of Potash in 
Fresh Manures 
4.98 
3-59 
^.20 
3-89 
Percent of Potash in One- 
Year-Old Manures 
5.62 
6.92 
7.87 
4.86 
Average 4.42 
Average 6.32 
The results of the deterioration experiment were 3.89 percent in 
the fresh and 6.00 percent in the one-year-old samples. 
After the first year the potash does not seem to accumulate fur¬ 
ther, and taking into consideration the loss in weight which occurs 
each year, there is an absolute loss from that time on. 
Phosphoric Acid. 
The phosphoric acid determinations are very close together vary¬ 
ing very little from 1.2 percent with a few exceptions due for the most 
part to a difference in feed. 
An interesting question arises as to the loss of phosphoric acid 
and the accumulation of potash during the first year. From what 
we know of the phosphates, they are as soluble as the potash salts and 
the loss of phosphoric acid can therefore hardly be accounted for by the 
leaching which took place. 
Crude Fiber. 
The crude fiber is a determination not often made on samples of 
manure, and does not appear to be of much value here as a criterion of 
either the age or the value of the manure. In a general way, the 
crude fiber decreases with age, but there is a wide range in the figures 
without any apparent reason for it. 
Nitrates. 
The question of nitrates in the manure dici not come up until most 
of the samples had been thrown away. (However, the results obtained 
