EXPERIMENTS IN SCOTLAND 



79 



superior to that found in land from which, as at Rothamsted, 

 the whole of the produce has been systematically removed. 



\Yright has calculated the money profit per acre from the 

 use of each manure, or mixture of manures, with the following 

 result : 



TABLE XXIV. 



PROFIT PER ACRE FROM THE APPLICATION OF AMMONIACAL 

 MANURES TO OATS. 



The amount of profit realised from any application of 

 manures varies of course immensely in different seasons. It is 

 not only influenced by the productiveness of the season, but 

 by the market prices of the manure used, and of the corn and 

 straw which form the saleable product. In each season, how- 

 ever, the use of f cwt. of sulphate of ammonia for oats on lea 

 land shows a distinct profit, and the profit increases when 

 superphosphate, and superphosphate and kainite are used in 

 addition. 



In 1897, one of the experimental plots received a double 

 dressing of sulphate of ammonia, namely i cwt. The extra 

 amount of ammonia salt paid for its application, the double 

 dressing yielding more than four bushels of dressed corn, and 

 nearly five cwts. of straw, more than the single dressing. 



\Yright points cut that the greater luxuriance of the oat 

 crop resulting from artificial manuring tends to keep down 

 weeds. 



