CONTRIBUTIONS FROM THE WISLEY LABORATORY. 177 
2 per cent, of organic matter (loss on ignition). Its mechanical 
analysis was as follows : — ■ 
Fine gravel . . 3-3 Silt . . 8*0 
Coarse sand . . 49-1 Fine silt and clay 8*0 
Fine sand . . 30*2 (Clay about 2 per cent.) 
The plot had been uniformly treated for many years, and had received 
no organic manure since 191 5. It was situated on a slight slope 
downward from S.W. to N.E., and was fairly uniform in character, 
the soil being if anything slightly heavier at the lower end. Its 
reserve of lime was so small that it was on the verge of acidity. It 
was not, however, practicable to give it a dressing of chalk before 
sowing the green crops. 
The total area of the plot was 0-28 acres. It was divided into 
forty-eight plots, each 15 feet by 17 feet (about one rod), and sown 
with the crops at the rates and distances shown in Table I., each 
crop thus being grown on four plots. The plots were arranged in 
chessboard fashion, to eliminate as far as possible errors due to 
possible lack of uniformity in the soil, as shown in the following plan, 
in which the crops are designated in accordance with Table I. 
Plan showing arrangement of plots. 
48 
46 
44 
42 
40 
38 
36 
34 
32 
30 
28 
26 
24 
22 
20 
18 
16 
14 
12 
10 
8 
6 
4 
2 
c 
L2 
N 4 
L 4 
N2 
c 
Ni 
Li 
N5 
L 3 
N 3 
L5 
c 
L2 
N2 
u 
N 4 
c 
Ni 
L5 
N 5 
L 3 
N 3 
Li 
47 
45 
43 
4i 
39 
37 
35 
33 
31 
29 
27 
25 
23 
21 
19 
17 
i5 
13 
11 
9 
7 
5 
3 
1 
Li 
N 3 
L 3 
N 5 
L5 
Ni 
c 
N 4 
u 
N2 
L2 
c 
L 5 
N 3 
L 3 
N 5 
Li 
Ni 
c 
N2 
L 4 
N 4 
L2 
c 
< 360' ■ > 
Table I. 
KeyNo. 
(See 
Plan) 
Name of Crop. 
Quantity Sown. 
Plot. 
Acre. 
Dist. of 
Drills. 
Ni 
N2 
N 3 
N 4 
N 5 
Li 
L2 
L 3 
L 4 
L5 
Mustard, Sutton's White 
Rape, Sutton's ..... 
Rye, Carter's Finest . 
Oats, Carter's Winter .... 
Turnip, Dawkin's Early White Stone 
Black Medick, Sutton's Yellow Trefoil . 
Clover, red, Sutton's Canadian 
Clover, crimson, Sutton's Early Red 
Trifolium ..... 
Lupine, annual, Sutton's Blue 
Vetch, Carter's Common Winter Tares . 
2 OZ. 
I OZ. 
lib. 
1 lb. 
1 OZ. 
3 oz. 
2 OZ. 
3 oz. 
8 oz. 
12 oz. 
20 lb. 
10 lb. 
160 lb. 
160 lb. 
10 lb. 
30 lb. 
20 lb. 
30 lb. 
80 lb. 
120 lb. 
Broad- 
cast 
a" 
a" 
9" 
a" 
a" 
a" 
9" 
6" 
C 
I 
Control. No green crop 
The crops were sown on August 20 and 21, 1919 ; all came up 
well except lupines, which germinated very badly (less than 20 per 
cent.). 
As was to be expected, the non-leguminous crops made most 
