176 



EXPERIMENTAL FARMS 



2 GEORGE V., A. 1912 



be possible after its collection, on the thoroughly prepared land to be sown and im- 

 mediately harrowed. The application may be at the rate of 100 to 300 lbs. per acre, 

 and the operation is the more likely to be successful if carried out on a cool, damp, 

 cloudy day. 



THE RELATIVE VALUE OF FIELD ROOTS. 



In this investigation, analysis is made season by season of the mangels, turnips 

 and carrots, as grown on the Central Experimental Farm, Ottawa. This work has 

 been carried on with the view of obtaining data respecting the relative feeding value 

 of the leading varieties of field roots and of ascertaining the differences in composi- 

 tion that might result from varying seasonal conditions. This work has been carried 

 on since 1903. 



MANGELS. 



The eight varieties grown in 1910, have been cropped here for a number of years 

 past and are all well-known mangels. In the following table they are arranged accord- 

 ing to their richness in dry matter. The percentage of sugar, which as a rule, but 

 not invariably, follows the dry matter-content, and the average weight of root, are 

 also given. 



Analysts of Manoki.s, O. E. F., Ottawa. Oxt., 1910. 



Variety. 



Giant Yellow Intermediate 



Pi ize Mammoth Long Red.... 



Yellow Intermediate 



Perfection Mammoth Long Red 



Half Sugar White 



Gate Post 



Selected Yellow Globe 



Giant Yellow Globe 



Water. 



p. c. 



88 

 88 

 89 

 89 

 89 

 90 

 92 

 92 



•43 



•50 



04 



21 



•90 



•41 



01 



20 



Sugar in 

 Juice. 



c. 



38 

 81 

 69 

 14 

 95 

 20 

 79 

 74 



Average 

 Weight of 

 One Root. 



Lbs. Oz. 



3 

 8 

 2 



14 

 4 

 8 

 



13 



Between the first and the last, the richest and the poorest of this series, consider- 

 able differences are to be noted. Thus, in dry matter we find a difference of 3-77 per 

 cent, and in sugar of 2-61 per cent, from which we may conclude that the poorest 

 variety is approximately one-third less nutritive than the richest. In so far as the 

 nutrients are concerned, this means that one ton of the latter is equivalent to about 

 3,000 lbs. of the former. 



Averages from the results of the past seasons are given in the following table: — 



