26 Experiments loiUi different Top-Dressings upon Wheat. 
Composition of Soil in fJi'i Experimental Wlieat-Field ; Field JVo. 10 of 
the Royal Agricultural College Farm, Cirencester. 
a. Mechanical Analysis. 
Moisture 1-51 
Organic matter and water of comLinatioii .. 11 '08 
Lime 10-82 
Fine clay 52-0(? 
Coarse clay and a little sand 24-53 
100-00 
Like most land in the neiglibourhoocl of Cirencester, tliis soil 
contains very little sand that can be separated by washing. 
b. Chemical Analysis. 
Moisture 
Organic matter and water of combination 
Oxides of iron and alumina 14-25 
Carbonate of lime 10-82 
Sulphate of lime 
Magnesia 
Potash (sol. in acid solution) 
Soda (sol. in acid solution) 
Phosplioric acid 
Insoluble siliceous matter (chiefly clay).. 
1-51 
11-08 
•71 
•51 
•32 
•05 
•10 
Gl-78 
101-13 
This soil resembles much in composition that on which the 
experiments were made in 1860 : both are calcareous clay-loams. 
There is, however, some difference between them. Field No. 19 
contains rather more clay, and rests on a less porous subsoil than 
field Nos. 3 and 5, on which the experiments were made in 
1860. On the whole No. 19 is inferior to Nos. 3 and 5, and 
probably not so uniform in its depth and general character as the 
latter. The whole of this field was in wheat. Two acres of the 
most uniform portion of the land Avere carefully divided into 
8 equal plots, measuring exactly \ acre. 
These plots were manured as follows : — 
Experiments, 18G1. 
Plot. 
I. 
II. 
III. 
IV. 
VI. 
VII. 
VIII. 
Manure applied. 
Peruvian guano 
Wheat-manure (the same as iu 1860) 
Nitrate of soda 
Uuraanured 
f Nitrate of soda 
\ Common salt 
Common salt 
Sulphate of ammoiiia 
Ulmate of ammonia 
Rate of 
Cost of 
Dressing 
Man\irc 
per Acre. 
per Acre. 
cwt. 
£. s. d. 
n 
1 \1 6 
4 
1 12 0 
1 2 C 
"n 
1 1 5 6 
3 
3 
0 3 0 
2 
1 12 0 
6 
2 5 0 
