154 
INVESTIGATIONS ON ROTHAMSTED SOILS. 
Table 83. — Hoos field barley soils, etc.— Continued. 
Plat. 
Annual manuring since 1852. 
Potash in fine dry 
soil. 
Dis- 
solved by 
strong 
hydro- 
chloric 
acid. 
Dissolved 
by 1 per 
cent solu- 
tion of 
citric acid. 
Yield per acre 
in 1890. 
Barley. 
3 Potash, etc. (no phosphates) 
3 Ammonia salts, potash, etc. (no phosphates) 
3 Nitrate of sod a, potash , etc. (no phosphates ) 
3 Nitrate of soda, silicate of soda, potash, etc. 
(no phosphates). 
Average of above four plats 
4 Superphosphate, potash, etc 
4 Ammonia salts, superphosphate, potash, 
etc. 
4 Nitrate of soda, superphosphate, potash, 
etc. 
4 Nitrate of soda, silicate of soda, superphos- 
phate, potash, etc. 
Averages of above four plats 
1 Rape cake only 
2 Rape cake and superphosphate 
3 Rape cake, potash, etc. (no phosphate) 
4 Rape cake, superphosphate, potash, etc 
1 Farmyard manure for 20 years, unma- 
nured for last 18 years. 
2 Farmyard manure for 38 years 
Per cent. 
.318 
.257 
.239 
.230 
Per cent. 
.0366 
.0407 
.0350 
.0454 
261 
.300 
.326 
210 
250 
.272 
.170 
.194 
.219 
.238 
159 
167 
Bushels. 
23£ 
.0394 
.0340 
.0298 
.0305 
.0270 
. 0303 
,0079 
.0079 
.0351 
.0304 
.0135 
.0321 
