512 



Field Experiments on Root- Crops. 



cast between the drills when the plants are strong, say about the 

 second hoeing. 



Mr. Kimber tried another set of experiments with swedes on 

 a field which, in 18G5, grew wheat, with dung; was again 

 dunged and planted in the autumn with green rye, Avhich was fed 

 off by sheep in the spring of 1866 ; the land was then worked, 

 and the swedes drilled with 3 cwts. of superphosphate. After 

 the swedes were singled out, and strong, a portion of the most 

 uniform part of the field was divided into six plots of l-20th of 

 an acre each. To two of these plots crude potash-salts were 

 applied on the 26th of July, to two common salt, and two plots 

 were left without any saline manure. 



The following results were obtained : — 



ExpEPaMENTS on Swedes, after Green-Eye, made at Tueney Waeken, 

 Abingdon, 1866. 



(All the Experimental Plots were manured with Superphosphate, at the rate 

 of 3 cwts. per Acre.) 



Plots. 



Auxiliary Dressing. 



Quantity 

 per Acre. 



Produce per 

 Acre. 



Increase over 



A verage 



of Nothing 



Plots. 



Crude potash-salts 



None 



Common salt . . 

 Crude potash-salts 



None 



Common salt .. 



tons. cwts. lbs. 



12 16 28 



11 19 32 



13 4 32 



12 10 20 



12 10 20 



13 17 76 



tons. cwts. lbs. 

 11 58 



19 62 



5 50 

 (Average of 



2 and 5.) 

 12 4 82 



1 12 106 



Taking into consideration the natural variations of the pro- 

 ductive powers of the same field, we are forced to confess that 

 in these experiments neither salt nor potash-salts increased the 

 efficacy of the superphosphate results. 



Experiments ivith Crude German Potash-Salts at Burcott 

 Lodge Farm (1866) on Mangolds. — The soil of the experimental 

 field was a clay loam, which furnished, on analysis, the follow- 

 ing results, after drying at 212*^ Fahr. : — 



Composition of Experimental Mangold Field. 



Organic matter and water of combination .. .. 4'49 



Oxides of iron 8-08 



Alumina 2'98 



Phosphoric acid '24 



Sulphuric acid •• *19 



Carbonate of lime 1'19 



Alcalies and magnesia 1'68 



Insoluble silicious matter (chiefly clay) 81'15 



100-00 



