24 



ARTIFICIAL MANURES 



CH. 



Total Produce 



per acre. 



7000 Ib. 



6000 



5000 



4000 



3000 



KSXvXxi Grain per Acre.lb. ^HH Straw per Acre, Ib. 

 Fig. 8. Effect of extra nitrogenous manure on yield of wheat. Rothamsted. 



Plots 3 & 4. Unmanured. 



Plot 5. Potash and phosphates but no nitrogenous manure. 

 6. Potash and phosphates and sulphate of ammonia containing 43 Ibs 



N per acre. 

 7. Potash and phosphates and sulphate of ammonia containing 86 Ibs 



N per acre. 



8. Potash and phosphates and sulphate of ammonia containing 129 Ibs 

 N per acre. 



The columns represent total produce per acre, but the figures in the diamond 

 spaces give bushels of grain and cwts of straw per acre. 



