Section IV. 
THE HOOS FIELD BARLEY SOILS. 
BRIEF HISTORY. 
The Boos field experiments <>n the continuous growth of barley 
were very fully discussed in sir Henry Gilbert's lectures in relation 
both to the yield of crops under the various niannrial conditions 
observed ami to the composition of the crops. 
Fewer and less complete examinations have been made of the soils 
of the barley field than of those of the w heat field, bul ii is desirable 
thai the results should be chronicled and briefly discussed, if only 
for Comparison with those of the wheat soils. 
The scheme of manuring and the crop results up to the t ime of the 
last analyses of the Boils tor nitrogen conlents (IKS:!) may first be 
recalled to yon by the following table, condensed from the Rotham- 
sted Memoranda: 
Tabli ?<>. — Hoot field oonHnuotu barley plcUs, 
Average annual 
produce per 
acre (thirty 
years. lS.->2 IsSl.) 
Grain. 
Straw. 
Husht'ls. 
171 
23 
w 
Cwt. 
10ft 
u# 
10} 
'•iii 
w 
m 
w 
25} 
19 
34* 
m 
in 
28 
21} 
29} 
36 
m 
47} 
20} 
26J 
22* 
29| 
43} 
24i 
45 
52£ 
52} 
26} 
25 
27} 
43* 
25 
• 
m 
O, No ni t rogen 
A. 2W) pounds am- 
monium salts, con- 
taining l'-> pounds 
nitrogen. 
A A, -'; "> pounds so 
dium nitrate, con- 
taining 43 pounds 
nitrogen. 
A AS, 275 pounds so- 
dium nitrate and 
lim pounds sodium 
silicate. 
C, 1. 000 pounds rape 
cake. 
Plat. 
Treat mont. 
No phosphates or potash, etc 
:ij hundredweight superphosphate 
200 pounds potassium sulphate, LOO pounds so- 
dium sulphate. 100 pounds magnesium sul- 
phate i no phosphates). 
3j hundredweight superphosphate, together 
with potassium, sodium, and magnesium salts, 
as on plat 3. 
Xo phosphates or potash, etc 
Superph' isphate as on plat 2 
Potassium, sodium, and magnesium salts, as on 
plat 3. 
Superphosphate and potassium, sodium, and 
magnesium salts, as on plat 4. 
No phosphates or potash, etc 
Superphosphate 
Potassium, sodium, and magnesium salts 
Superphosphate and potassium, sodium, and 
magnesium salts. 
1 No phosphates or potash, etc 
2 Superphosphate 
3 Potassium, sodium, and magnesium salts 
nesium salts. 
No phosphates or potash, etc., except contained 
in the rape cake. 
Superphosphate 
Potassium, sodium, and magnesium salts 
Superphosphate and potassium, sodium, and : 
magnesium salts. 
Farmyard manure for twenty years, but un- 
manured since 1871. 
Farmyard manure continuously 
141 
