16 



THE MANURE HEAP 



[CH. 



Thus, for turnips the following results were obtained by 

 Hendrick and Greig at Aberdeen 1 in 1904 a favourable season 

 in which the manures were able to exert their full effect: 



The dose of artificials consisted of -^ cwt of sulphate of 

 ammonia, 2| cwts superphosphate, f cwt sulphate of potash. 



These results were greater than could be obtained by increasing 

 the dressing of dung: 



Dressing per acre ... No manure 10 tons dung 15 tons dung 



tons 

 9 



cwts 



H 



tons 

 18 



cwts 



tons 

 19 



cwts 

 14 



Yield of turnips ... 



In a poorer growing season, or where the conditions are such 

 that the crop does not exceed 15 or 16 tons, these results are not 

 obtained. 



Thus at Rothamsted swedes in 1915 gave the following crops 

 in tons per acre : 



No manure 

 9-6 



10 tons dung 

 12-9 



10 tons dung 

 + artificials 



12-9 



Artificials alone 

 12-7 



Similar results were also obtained at Leeds 2 . 



The benefit of artificials is not confined to the root crop, 

 they help the other crops in the rotation also. This is well seen 

 in the Saxmundham experiments, the results of which are plotted 

 in Fig. 7. 



In using farmyard manure for swedes remember that finger and 

 toe is carried by the manure, and if diseased roots have been fed 

 to animals the crop receiving their manure is likely to get the 

 disease also. 



Mangolds want more nitrogen than farmyard manure supplies. 

 The average of 27 years experiment at Rothamsted has been: 



Dung alone Dung + nitrate of soda 

 Tons per acre Tons per acre 



17-4 24-7 



1 Aberdeen Bull. No. 4, 1904. 



2 Leeds Report, No. 3, 1898. 



