166 FOOD FOR PLANTS 



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 an- 

 nually ; and the remaining series various nitrogenous 

 materials in addition to the acid phosphate and potas- 

 sium chloride. Also the nitrogenous materials have 

 since been applied annually. The following diagram 

 shows the treatment for each series: 



Diagram of Experiment. 



Series 



a 



1. Check 



2. Minerals 



3. Manure, solid, fresh 



4. Manure, solid and liquid, fresh 



5. Manure, solid, leached 



6. Manure, solid and liquid, leached 



7. Sodium Nitrate, 5 gms. 



8. Sodium Nitrate, 10 gms 



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



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



11. Manure, 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 ammo- 

 nium sulphate and dried blood were applied in 

 amounts equivalent to the larger application of Ni- 



b c 











































c 







































