THE HROADHALK WHEAT SOILS. 
shown in its less rich neighbor, plat 2a; l>ut this may be due to mere 
accident of the distribution of the rainfall during the time of sam- 
pling. If we regard the first and second depths conjointly, we find 
that plat -1) contains nearly o»j pounds of nitric nitrogen per acre as 
againsi 46 pounds in plat 2a. The nitric nitrogen in the first IS inches 
of the continuously dunged plat is equal to more than hundred- 
weight per acre of nitrate of soda, while, if the third depth be included, 
the quantity of nitric nitrogen in the 27 inches is equal to nearly 4 
hundredweight Of nitrate of soda per acre. But how transient this 
surface richness is, and how readily and rapidly it escapes downward, 
i> Been by the fact that, under the influence of recent rain, the actual 
surface soil — the first 9 inches — is already scarcely richer than that 
of the wholly unmanured plat 3. Only l < ».-"»:; pounds out of the 68 
pounds contained in the first 27 inches remained at the time of sam- 
pling in the surface soil. The bulk of the recently formed nitrates 
had already sunk into the second !» inches, and we may take it that a 
Printer sampling would probably have revealed much less nitric nitro- 
gen in 1 he second dept h. 
The rape-cake plat is rich in surface nil rates, and in all 1 hree dept lis 
it closely resembled, in IN«.i:$, the dunged plats, being intermediate in 
richness between the continuously dunged plat and the plat dunged 
for nine years only. 
THE CHEMICALLY MANURED PLATS. 
\\V will now examine the data obtained from the various chemically 
manured plats. The tirsl series thai it is convenient to consider is 
the series of plats ."> to s, all receiving a full dressing of superphos- 
phate, potassium, sodium, and magnesium salts ("full minerals"), 
but with and without various dressings of ammonium salts applied 
under similar "onditions in the spring. For comparison we will also 
again include plat 3. 
Tablk fc.—Broa'lbalk wheat soils, />l<tts.;. ',, ?, a ihI S— Nitrogen as nitkatks 
(" nitric" nitrogen) in §amplet collected in October, 1898, 
Depth. 
Plat 3, un- 
manured. 
Plat 5. full 
mineral-: no 
nitrogen 
since 1851. 
Plat 6, full 
mineral ma 
nu res and 
ammonium 
salts con- 
taining 
43 pounds 
of nitrogen 
per acre. 
Plat 7. full 
mineral ma- 
nures and 
ammonium 
salts con- 
taining 
86 pounds 
of nitrogen 
per acre. 
Plat S.full 
mineral ma- 
nures and 
ammonium 
salts con- 
taining 
129 pounds 
of nitrogen 
per acre. 
Pounds. 
I 'omuls. 
Pounds. 
Pounds. 
Pounds. 
First 9 inches 
9. (V4 
10.53 
14. 13 
14.96 
17. 40 
Second 9 inches 
9.22 
f). 3»i 
12. 74 
19.21 
89. 17 
2. 74 
2.23 
5.81 
8.54 
8.71 
.95 
2.9S 
5.32 
8.71 
Fifth '.♦ inches 
1.00 
3. 47 
4.64 
8.51 
Sixth 9 inches 
.71 
3. 72 
4.40 
7.46 
Seventh finches 
1.03 
3.25 
4.51 
7.99 
Eighth 9 inches 
.92 
1.89 
4.l»2 
7.60 
Ninth Inches 
.87 
2.46 
4.89 
6. 13 
Tenth !» inches 
.57 
2. 16 
4.38 
5. 64 
1 to -'7 inches 
21.60 
1«. 12 
32.68 
42. 71 
55.28 
1 to 78 Inches 
23. 73 
47.99 
65.60 
95. 55 
1 to Winches 
25 17 
52. 61 
74.27 
107.32 
