514 



Field Experiments on Root- Crops. 



Composition of the Experimental Swede Field. 



Soil dried ^ 

 at 212° Fahr. 



Organic matter and water of combination ., .. 6'16 



Oxide of iron 7*91 



Alumina 2*61 



Phosphoric acid '17 



Sulphuric acid 'IS 



Carljonate of lime '51 



Alcalies and magnesia 1'61 



Insoluble silicious matter (chiefly clay) 80'87 



100-00 



The character of the field, which measured 18 acres, varied a 

 good deal in different parts, and some difficulty was experienced 

 in finding a uniform and level piece on which the experiments 

 could be tried. The following sketch will render more in- 

 telligible the remarks which Mr. Vallentine sent me with his 

 report ; — 



Sketch of Experimental Swede Field — 18 Acres. 

 North. 



West. 



DuEg and Artificials. 

 Inferior Crop. 



E 



15 Tons of 



Dung without 



Artificials. 



Artificials alone. 

 (5 cwts. of Bone-super- 

 phosphate per acre}. 



East. 



South. 



45 lbs. of crude potash-salts were applied on February 28th to 

 the space marked A, which measured 80 yards in length and 

 6 in breadth, or 1-lOth of an acre. A space 3 yards wide, and 

 80 yards long, was taken in the middle of the piece as l-20th of 

 an acre, for ascertaining the weight of the crop, which was 



