( 100 ) 
r VI. — Experiments with different Top- Dressings upon Wheat. 
By Dr. Augustus Voelcker. 
In Vol. XX., Part II., and Vol. XXIII. of this Journal, reports 
Avill be found of experiments made by me in 1859-G0-61, witb 
top-dressings upon wheat. I have now the pleasure of laying 
before the Society a short account of similar wheat experiments 
made in 1862. 
Wheat Experiments made in 1862. 
The field on which the wheat was grown is well drained, 
moderately stiff, and on the whole fair wheat-land. The depth 
of the surface-soil varies from 6 to 8 inches. 
A large quantity of the soil from the experimental field 
(fields Nos. 16 and 17 on the map of the Royal Agricultural 
College Farm) was turned over and well mixed, so as to obtain 
a fair average sample for analysis, which gave the following 
results : — 
' Composition of Soil in Field No. 16 and 17, Royal Agricidtural College 
Farm. 
Moisture (when analysed) 2"71 
'Organic matter and water of comliiiiatiou .. lO'DO 
Oxides of iron and alumina IG'll 
Carbonate of lime 17"43 
Sulphate of lime "23 
Magnesia 1-75 
Phosjihoric acid 'll 
Chlorine traces 
Potash -86 
Soda -91 
Insoluble siliceous matter (clay) 49"44 
100-45 
♦Containing nitrogen '38 
Equal to ammonia "46 
This soil contains hardly any siliceous sand separable by the 
mechanical process of washing and decantation, and consists 
principally of clay, carbonate of lime, and organic remains. It 
is a calcareous clay. 
The subsoil is a mechanical mixture of stiff yellow clay witli 
limestone rubble resting on forest-marble rock. On analysis it 
furnished the following results : — 
