Exiienments icith different Top-dressirujs upon Wheat. 101 
Composition of SubsoU in Field No. IG and 17, Royal Agricultural College 
Farm. 
Moisture (when analysed) 1"34 
•Organic matter and water of combination .. .. 8'07 
Oxides of iron and almnina 21-68 
Carbonate of lime SG'TG 
Sulphate of lime "32 
Magnesia "27 
Phosphoric acid "16 
Chlorine titices 
Potash -oG 
Soda -72 
Insoluble siliceous matter (clay) 30"57 
100-45 
♦Containing nitrogen •34 
Equal to ammonia '41 
Tills field is perfectly level, and the soil, as far as could be 
ascertained, uniformlv deep. Its extent is IG acres 11 poles. It 
was cropped in preceding years as follows : — 
1857. Cow-grass, mown and fed. 
1858. WTieat. 
1859. ^Mangolds, potatoes, cabbages. 
1860. Oats. 
1861. Vetches, followed bj white swedes and grey-top 
stone turnips. 
1862. Free trade wheat and seeds. 
This field generally grows good clover. 
Two acres covered with a tolerably equal plant were measured 
out, and carefully divided into 8 equal plots of ^ acre each. They 
were surrounded by a considerable breadth of the general wheat- 
crop. These 8 plots, with the exception of plot No. 5, which 
was left unmanured, were top-dressed as follows : — 
Top-dressing 
Eate of Dressing per Acre. 
(j cwt. of nitrate of soda andl' 1 cwt. of nitrate and) 
I h cwt. of salt J I 2 cwt. of common salt f 
f42 lbs. of nitrate of soda andl I 1^ cwt. of nitrate and) 
I 84 lbs. of salt /j 3 cwt, of common salt) 
ji cwt. of nitrate of soda andV 2 cwt. of nitrate andl 
( 1 cwt. of common salt . . ../! 4 cwt. of salt .. ..) 
^ cwt. of nitrate of soda .. .. | 2 cwt. of nitrate of soda 
Unmanured j 
84 lbs. of common salt .. .. 3 cwt. of salt 
cwt. of Peruvian guano andV 2 cwt. of guano andl 
\ ^ cwt. of salt ji 2 cwt. of salt .. ..) 
J cwt. of Peruvian guano . . •• \ - °^ Peruvian guano 
The cold and wet spring of 1862 prevented the wheat from 
