78 RESULTS WITH OATS 



no precise agreement is thus to be expected in the results 

 obtained in different years. 



It will be noticed that the addition of superphosphate to 

 the ammonia salts generally increased the yield of corn, but 

 by no means in every case the yield of straw. On individual 

 farms, as those in Fifeshire in 1896, superphosphate had no 

 beneficial effect. 



The addition of potash salts produced generally a consider- 

 able increase of crop. It was noticed that the crop always 

 stood up much better and ripened earlier where kainite and 

 superphosphate had been employed. The proportion of light 

 corn was also reduced by the use of kainite. When oats were 

 grown after roots manured w r ith dung the addition of potash 

 salts appeared to be unnecessary, the dung supplying the 

 potash needed by the crop. A double dressing of kainite was 

 used in some cases without advantage. 



In order to compare these Scotch results with those 

 obtained at Rothamsted already quoted, we have calculated 

 the increase obtained from i cwt. of sulphate of ammonia. 

 This calculation, can, however, only be made in the case 

 of the Scotch plots receiving sulphate of ammonia alone, 

 as the experiments do not generally include plots receiving 

 superphosphate and potash without ammonia salts. 



AVERAGE RETURN FOR i CWT. OF SULPHATE OF AMMONIA. 



Corn Straw 



bushels cwts. 



1894 i3'3 n'5 



1895 io-i 5-3 



1096 ... ... 9-0 6'2 



Mean 10-8 7-7 



The return for sulphate of ammonia used alone is thus 

 considerably better than that shown in the Rothamsted ex- 

 periments with 200 Ibs. of ammonia salts used alone, namely 

 6'4 bushels of corn and 4-3 cwts. of straw, and is about equal 

 to the return obtained at Rothamsted when superphosphate 

 and alkalies were added, namely 11-2 bushels of corn, and 7-5 

 cwts. of straw. The supply of phosphates and potash in land 

 cultivated as an ordinary rotation is of course generally much 



