I20 



Journal of Agricultural Research 



Vol. XV, No. a 



TablB IV. — Quantity, in cubic centimeters, of NJ20 sodium hydroxid necessary to titrate 

 to three different hydrogen-ion concentrations, Pb.7 Pb^-3> ond Pn9-3 — Continued 



TITRATION TO PflS-S 



Age of silage. 



Alfalfa alone. 



Water. 



Alcohol. 



Sweet clover alone. 



Water. Alcohol. 



Sweet clover and corn- 

 chop. 



Water. 



Alcohol. 



Days 

 o 



I 



2 



3 



4 



6 



7 



8 



10 



13 



15 



17 



21 



29 



43 



64 



3-3 

 8.6 



II. o 



II. I 

 8.4 



10. I 

 14. 2 



11. 8 



13-5 

 13-5 

 15.0 



14.7 

 21. 6 

 21. 8 

 26. o 

 26. 9 

 26. 5 



6.3 

 8-5 



II. o 



II. I 

 "•3 

 "•3 

 II. 2 

 13.2 

 14. o 

 14.8 

 15.8 

 16.8 

 18. I 

 21.5 



25-7 

 26. 4 

 29. 2 



2.9 



5- I 



6.7 



8.1 



10. 4 



13.0 



9-3 

 12.5 

 12. 2 

 "•5 

 ^3-3 

 15- I 

 14-5 

 13.8 

 14. o 

 12. 7 



14. o 



3-1 

 6.2 

 6.9 



8.0 

 "•5 



II. o 



12. 6 

 14. 6 

 14.8 

 14.4 

 19.8 

 18.5 

 18.7 

 21. 4 

 21.8 



3-3 

 4.9 



5-4 



6.5 

 8.2 



12.4 

 II. I 

 14. 2 



15-6 

 18.0 

 18.2 

 20. I 

 23.0 

 23-7 



TITRATION TO Ph9.3 



O 



I 



2 



3 



4 



6 



8 • 



10 



13 



15 



17 



21 



29-- 



43 



64 



98 



6.3 



II- 3 

 12. 2 



13-5 

 17.4 

 17.8 



14-3 



17.7 



17.7 



19-3 



20. I 

 22. 6 

 24. I 

 20.8 



21. I 

 19-5 



5-2 



8.5 



9.9 



II. 7 

 13-8 

 15.0 



18. 2 



17.7 

 21.4 

 21.5 

 23.2 

 25.8 

 26. 7 

 28. o 

 31-8 

 32.7 



Tljie data presented in Table IV show the following results : 

 (i) The acidity values obtained by the electrometric titration were 

 practically the same for the alcoholic extract as for the water extract. 

 In this respect it differs fundamentally from the colorimetric titration. 



(2) Titrating to the true neutral point, Ph7, gave a much lower acid- 

 ity value than the colorimetric titration (fig. 2). Compare Tables III 

 and IV, part i.) 



