Oct. 29,1917 
Fungus Fairy Rings 
223 
The determinations of nitrogen in the form of ammonia and nitrates 
in Calvatia cyathiformis rings for 1915 are summarized in Table XI. 
In the case of rings of C. cyathiformis more ammonia was found in the 
outside than on the inside or in the zone which had produced fruits. 
In the case of nitrates the reverse was found to be the case, the nitrates 
being somewhat more abundant in the ring than either outside or inside. 
The determinations from samples taken in 1916 are given in Table XII. 
TabeE XI. —Quantity {in parts per million) of ammonia and nitrates in Calvatia cyathi¬ 
formis rings, Akron, Colo., 1915 
Ring No. and date. 
Depth. 
I 
Nitrogen in the form | Nitrogen in the form 
of ammonia. ! of nitrates. 
Out¬ 
side. 
In 
ring. 
In¬ 
side. 
Out¬ 
side, 
In 
ring. 
In¬ 
side. 
Ring 5, June 2 6 , 1915. 
Do. 
Feet. 
1 
2 
1 
2 
3 
X 
% 
19 
II 
21 
11 
*9 
II 
3 
3 
IO 
Tr. 
Tr. 
8 
Tr. 
0 
5 
8 
6 
10 
11 
Tr. 
8 
0 
6 
Tr. 
Tr. 
11 
Tr. 
Ring k, July 13. inic . 
Do. 
Do. 
Ring 5. July 28, I 9 I 5 . 
Ring c, Aug. 16, ion;. 
13 
37 
34 
O O' O r 7 J 
Mean. 
1 
2 
3 
13 
11 
29 
11 
27 
11 
5 
2 
Tr. 
5 
6 
10 
i 
6 
Tr. 
Tr. 
Do. 
Do. 
TabeE XII. —Quantity {in parts per million) of nitrogen as ammonia and nitrates in 
Calvatia cyathiformis rings, Akron, Colo., iqi 6 
Sample 
No. 
Nitrogen in the form of 
ammonia. 
Nitrogen in the form of 
nitrates. 
Y-8. 
V~9. 
Y- 10 . 
! 
Aver¬ 
age. 
Y-8. 
Y-9. 
Y- 10 . 
Aver¬ 
age. 
Outside. 
I 
4-3 
i 
i 
4.3 
4-3 
7 . I 
5- 7 
8.6 
7 I 
Among new fruiting 
bodies. 
2 
I. 4 
2.9 
5- 7 
3-3 i 
2. 9 
8.6 
12. 9 
8. 1 
Among old fruiting 
i 
bodies. 
3 
1.4 
. O 
2.9 
1. 4 | 
8 . 6 1 
7 - 1 
10. 0 
8.6 
Inside. 
A 
2. 0 
2. O 
2. 0 
2. 0 1 
8. 6 | 
r 7 
7 t. 
‘r 
■** y 
y 
y | 
1 
> / 
Ammonification took place in all samples shown in Table XIV. The 
greatest increases were recorded in the soil outside the ring. Nitrification 
was low in this sample. In the young mycelium ammonification and 
nitrification were almost as rapid as in the natural soil. In the soil 
with dense mycelium both ammonia and nitrates were relatively high at 
the beginning of the experiment. Ammonification was rapid, but nitri¬ 
fication very slow during the first 5-day period. At the end of 2 weeks 
the ammonia had increased even more than during the 5-day period, 
while the nitrification was very high, much of the ammonia having been 
7769°—17—3 
