212 



Fertilisers 



[PT. Ill 



applied as nitrate of soda or of lime, sulphate of am- 

 monia, etc. ; in late districts or wet seasons super- 

 phosphate, etc., may be desirable to hasten ripening. 

 When the roots have been folded and barley is to be 



without Nitrogen. 

 A. 



With Nitrogen 



Cwt. per Ace 

 50 



Plots 



Fig. 38. Effect of manures on the yield of hay. The Park, 

 Rothamsted. (Average 57 years, 1856-1912.) 



Plots 3 and 12. Unmanured. Plot 4-1. Superphosphate only. 



Plot 8. Superphosphate, sodium and magnesium salts. 



,, 7. ,, ,, ,, + potassium salts.- 



4-2. Super and ammonium salts (86 lbs. N per acre). 



,, iO Super and ammonium salts + sodium and magnesium salts. 



,, 9. Super and ammonium salts + sodium and magnesium salts 

 + potassium salts. 



