AUTUMN OR SPRING MANURING 

 TABLE IX. 



43 



PRODUCE OF WHEAT AT ROTHAMSTED BY AUTUMN AND 

 SPRING APPLICATIONS OF AMMONIA SALTS. 



It will be observed that only in three seasons out of the 

 eleven is the produce greater from the autumn application, 

 and in only one of these seasons is the difference considerable. 

 In eight seasons the spring application proves the more 

 profitable, and in five of the eight very decidedly so. On an 

 average, the spring application gives a better result by 4 

 bushels of corn and 5^ cwts. of straw. The spring application 

 of the ammonia distinctly tends to increase the proportion of 

 straw. 



The experiment just quoted is particularly satisfactory, as 

 the plots receiving the autumn and spring dressings alternated 

 in the course of the experiment, Plot 7 receiving the autumn 

 sown ammonia, and Plot 15 the spring sown during the first 

 five years, while in the next six years the treatment was 

 reversed. Any natural difference in fertility of the plots 

 should not therefore affect the result. 



In the subsequent comparison, during fourteen years, of an 

 autumn application with an application of one quarter of the 

 ammonia in the autumn and three quarters in March, the 

 purely autumn application has proved the more profitable 

 in two seasons only. 



In the wheat experiments at Holkham, ammonia salts, at 



