HARX FIELD RdiiT-CRoP SOILS. 
165 
Table 87. — Swedish turnips in Bam field. Rothamsted — Average annual crop per 
acre (bulbs only) for fifteen seaso)is. 1856-1870. 
Plat. 
Standard manures. 
a 
■ 
E 
8 
1 
8 
T. 
E 
i 
Standard manures and cross dressed with— 
iiSI 
* 
/ - T - 
~~ a o 
■/ te i ft 
7. 
— = _x 
5"; Z 
IP 
S E —■ 
ipl 
« ■a* 
. X Z 
■i » £ 
E ~ 5 
1 ft >• 5 
~ a 
x • • r. - 
Mili 
/ = * a- 
| E g§ 5 
_ -l IS 8 | 
I a r_ = s 
§ ■ 'z. 
tit 
X - x 
X |~ 
■ 2 J, a 
r. 
•> 
3 
4 
5 
6 
Farmyard manure and super- 
phosphate 
No mineral manure 
Superphosphate ea<-h year: 
mix'-d alKaline salt-. KVi im 
Superphosphate rn< h year 
Superphospliate each year: 
potassium sulphate. 1868- 80 
Su])erphosphate each year: 
pi >tassium sulphate and am- 
Mean of plats 4. 5, and 1. . 
Tons. 
6 
1 

4 
7 
11 
Tons. 
7 
7 
cut. 
9 
13 
19 
Toji.s. 
8 
8 

Cut. 
8 
3 
18 
7'«iH*. 
8 
8 
8 
Cut. 
in 
It 
ti 
Tons. 
| 
a 

18 
8 
1 
2 
2 
lrt 
12 
7 
s 
4 
2 
u 
11 
4 
3 
4 
12 
10 
1 
ti 
5 
a 
l-' 
If, 
6 
5 
5 
B 
8 

a 
2 
12 
4 
13 
4 
12 
6 
15 
5 
9 
2 
12 
4 
15 
4 
4 
6 
4 
5 
8 
Samples of the soils taken toward the '.-lose of t lie period above 
included, and representing the first three depths of 9 inches each, were 
examined as regards their contents of total nitrogen, with the follow- 
ing results: 
