RODMERSHAM EXPERIMENTS 

 TABLE VIII. 



PRODUCE OF WHEAT PER ACRE AT RODMERSHAM. 

 AVERAGE OF THREE YEARS, 1857-59. 



The clay soil at Rodmersham was clearly better provided 

 both with nitrogenous plant food, and with the ash consti- 

 tuents required by wheat, than was the case at either Rotham- 

 sted or Holkham. The produce of the plots receiving no 

 nitrogenous manure remains fairly good even under continuous 

 wheat culture. The advantage gained by using superphos- 

 phate and alkalies with the ammonia salts is also distinctly 

 less. The return in corn for the ammonia applied is very 

 poor, while the return in straw is much larger. A smaller 

 dressing of ammonia salts would have been more profitable. 



3. Comparative effect of Autumn or Spring Dress- 

 ings. In the case of autumn sown wheat it is of course possible 

 to apply the ammonia salts either in autumn at the time of 

 wheat sowing, or else in spring as a top-dressing. As the 

 trials of the relative advantages of these methods which we 



