THF BROADKAI.K WHEAT sOILs. 
Takle 22.— Broadhalk irhrat soils, /,s.'/.;— Nitrooex and carbon fa surface soils 
of varum* plats, arranged in order of their average total yields of wheat and 
strair. 
Plat 
Annual manuring 
3 
4 
Hi 
li ib 
9b 
Unmanurefl 
Cnmanured since 1852 
Mineral manures only 
Ammonium salts only < 4<io pounds) mo 
minerals since 1844) 
Ammonium salts only <4O0 i>oniHlst (no 
minerals since 1N50) 
Sodium nitrate only: 
Formerly V,n p. ,umK .utainin^. . . . 
Latterly 276 pounds, containinu' .. 
Full minerals and ammonium salts ijim 
pounds) 
Phosphates and ammonium salt> il<«i 
pounds) 
Full minerals and sodium nitrate ..VVi 
pounds> sine.- lv<t . previously unma- 
nured for 1!» years i 
Phosphates, sodium and ammonium salts 
(400 pounds) 
Phosphates, magnesium and ammonium 
salts > * i w » pounds > 
Full minerals and ammonium salts < im 
pounds » | applied in autumn i 
Phosphates, potassium and ammonium 
salts > ' 4<Nl p. mnds i 
Full minerals and ammonium salts 1 4<»i 
pounds) 
Full minerals and sodium nitrate: 
Formerly 680 pounds, containing 
Latterly 27.") pounds, containing 
Full minerals and ammonium salts (mm 
pounds) 
Total 
annual 
\V e i i£ 1 1 1 
of wheat 
and 
straw (42 
year- av- 
erage '. 
Nitrogen. 
Nitro- 
gen sap 
plied an- 
nually in 
manure. 
Per cout. 
Pounds 
per acre. 
Organic 
carbon. 
I'numls. 

11 

l'itUUtls. 
1. H34 
2. mis 
8, Ml 
ii 0W2 
.IKI.S2 
.no 
2. 572 
2.5»o 
2. 620 
Per cent. 
0.888 
. '.1 HI 
.931 
86 
3, m 
.1069 
2 772 
LOtt 
80 
3.501 
.1064 
2. 759 
.969 
80 
43 
j 3. 7s«.i 
.1094 
2.836 
1.008 
4.J 
3.842 
.11(17 
2.870 
1.019 
HO 
3.MS8 
. un 
2.932 
1.1117 
86 
80 
i BM 
4.!C:J 
.1177 
.UN 
3,1)52 
3,096 
1.065 
1.123 
86 
5.112 
IMD 
3.241 
1.137 
86 
.-». m 
.]JM 
3. 199 
1.170 
86 
5.365 
.1162 
3.013 
1.165 
86 
5.02!) 
.1222 
3, 168 
1.101 
86 
43 
| 0.306 
.1189 
3,083 
1.162 
120 
0,013 
.1188 
3,080 
Lin 
Here, t lien, t he plal s are arranged in the order of 1 heir annual prod- 
uce in wheal and .straw. Willi but few exceptions, it will he seen 
that the percentage of nitrogen and — over a large part of the table — 
of carbon, also, in the surface soil, increases as the produce has been 
greater. Tims, in round numbers, the unnianured plats, giving about 
2,000 pounds of annual produce, contain, in their surface soil, under 
0.10 per cent of nitrogen (with carbon 0.9 per cent); the plat with 
minerals only giving 2, 24:2 pounds of produce, just over (». in per cent 
of nitrogen (with carbon only slightly over 0.9 per cent); and the 
plats with ammonium salts but without minerals (save for some early 
dressings prior to 1851), averaging :>,300 pounds of produce, contain 
(>. L06 per cent of nitrogen (with nearly 1 per cent of carbon). The 
plat with sodium nit rate without minerals has given more produce 
than thai receiving ammonium salts, although latterly the nitrogen 
supplied has been only half as much. Probably the sodium nitrate 
has been a better solvent for the minerals of the soil than ammonium 
salts; at any rate the produce has been nearly 3,800 pounds, and the 
nitrogen is over 0.109 per cent (with about 1.01 per cent of carbon). 
Then we come to the plats getting minerals as well as ammonium 
salts. Plat 6 gets full minerals (i. e., superphosphate and potassium, 
