Food for Plants. 145 



The experiments have been carried on in large galvan- 

 ized iron cylinders 4 feet long, 23.5 inches in diameter, 

 and open at both ends. The cylinders were sunk in the 

 ground until only about 2 inches of the upper portion 

 projected above the level of the surrounding soil. Uni- 

 form amounts of gravelly subsoil were placed in the 

 cylinders and firmly tramped down. Weighed quantities 

 of surface soil were then placed in the cylinders. In 

 order to enhance the accuracy of the data collected, each 

 treatment was carried out in triplicate. There were 

 secured thus 20 series, each consisting of three small 

 plats. Series 1 has received no applications whatsoever; 

 series 2, applications of acid phosphate and potassium 

 chloride repeated annually; and the remaining series 

 various nitrogenous materials in addition to the acid 

 phosphate and potassium chloride. Also the nitrogenous 

 materials have since been applied annually. The follow- 

 ing diagram shows the treatment for each series : 



Diagram of Experiment 



Series A B C 



1. Check n 



2. Minerals 



3. Manure, solid, fresli 



4. Manure, sold and liquid, fresli 



5. Manure, solid, leached 



6. Manure, solid and liquid, leached 



7. Sodium Nitrate, 5 s:ins 



S. Sodium Nitrate, lO^gms 



9. Manure, solid, fresh; nitrate, 5 gms 



10. Manure, solid, fresh; nitrate, 10 gms (I 



11. ]\Ianure, solid and liquid, fresh; nitrate, 5 gms. ... 



12. Manure, solid and liquid, fresh; nitrate, 10 gms... 



13. Manure, solid, leached; nitrate, 5 gms 



14. Manure, solid, leached ; nitrate, 10 gms 



15. Manure, solid and liquid, leached; nitrate, 5 gms.. 



16. Manure, solid and liquid, leached; nitrate, 10 gms. 



17. Ammonium sulphate 



18. Dried blood 



19. Manure, solid, leached; ammonium sulphate 



20. Manure, solid, leached ; dried blood 



The nitrate was applied at the rate of 160 pounds and 

 320 pounds per acre, respectively. The ammonium sul 

 phate and dried blood were applied in amounts equivalent 



