128 



Journal of Agricultural Research 



Vol. XV, No. a 



Table VII. — Quantity of nitrogen in titrable form as obtained by colorimetric titration 



FOR WATER EXTRACT 



Age of silage. 



Alfalfa alone. 



Cc. of Nl20 so- 

 dium hydroxid 

 corrected for 

 acidity to — 



Thy- 

 mol. 



Phe- 

 nol. 



Mgm. 

 of ti- 

 trable 

 nitro- 

 gen in 

 BX0.7. 



Sweet clover alone. 



Cc. of JV/20 so- 

 dium hydroxid 

 corrected for 

 acidity to — 



Thy- 

 mol. 



I'he- 

 nol. 



MgTO. 



of ti- 

 trable 



nitro- 

 gen in 

 BX0.7. 



Sweet clover and com 

 meal. 



Cc. of Njzo so- 

 dium hydroxid 

 corrected for 

 acidity to — 



Thy- 

 mol. 



Phe- 

 nol. 



Mgm. 

 of ti- 

 trable 

 nitro- 

 gen in 

 BX0.7. 



Days 

 o 



I 



2 



3 



4 



6 



7 



8 



10 



13 



IS 



17 



21 



29 



43 



64 



.4 



5-7 

 14.9 

 28.2 

 29. 8 

 27.6 

 29. I 

 34- o 

 35-4 



37' 



35' 



40. 



46. 



52. 



53' 



56.2 



60. 2 



64.7 



B 

 2.4 



5-9 

 17.8 

 18.4 



18.5 

 18.5 

 19. 6 



23-9 

 24. I 



17-7 

 21.5 



34-6 



32- 5 

 29. 6 



34- 5 

 38-0 



c 



1-7 

 4. I 



12.5 

 12. 9 

 13.0 

 13.0 



13-7 

 16. 7 

 16. 9 

 12. 4 



IS- 1 

 21. 2 

 24. 2 

 22.8 

 20. 7 

 24. 2 

 26.6 



/I 



6.4 

 18. 2 



20. 4 

 23.8 

 26. o 



21. 7 



B 



3-6 

 13.6 

 15.0 

 17-5 

 17-3 

 13-7 



c 



2-S 



9-5 

 10.5 

 12.3 

 12. I 



9.6 



A 

 S-2 



IS- I 

 17-5 

 19. I 



2>0 



24. 7 



B 



1.9 



9.8 



12. O 



13-5 

 14.8 



15-7 



22. 6 



29-3 



28. 7 



31-5 

 3°- S 

 40.8 



40- S 

 3S-S 

 36-4 

 39- S 



18.3 

 27. o 



27-5 

 23.8 

 23.8 

 26. 7 



II- 3 

 12. 4 

 12. 2 

 12.8 

 12. 8 

 18.9 



19-3 

 16. 7 

 16. 7 

 18. 7 



27. o 

 27. 6 

 3S-I 

 2,3-2, 

 3S-I 

 39-9 

 4S-8 

 40. 2 

 47. o 

 45-8 



13-8 

 18.3 

 21. 9 

 19. o 

 20.3 



23-3 

 28.8 



23-4 

 28. I 

 27. 2 



C 



1-3 

 6.9 



8.4 



9-5 



10. 4 



11. o 



9-7 

 12.8 



15-3 

 13-3 

 14. 2 

 16.3 

 20. 2 

 16. 4 

 19.7 

 19. o 



FOR ALCOHOLIC EXTRACT 



O. 



I. 

 2. 



3- 

 4- 

 6. 



7- 

 8. 

 10. 

 13- 

 IS- 

 17- 

 21 . 

 29. 



43- 

 64. 



14. I 

 27. 2 

 31-4 

 32-5 

 32. o 



34-7 

 36. o 



39-7 

 41-5 

 44. 2 



45- 5 

 46.9 



47-9 

 55-7 

 60. o 

 64. o 



6.4 



IS- 5 

 19.4 



19. 6 



18.5 

 19.8 



20. 6 

 24.7 



24. 6 



25. 2 

 25.6 



26. I 

 25-5 

 30- 5 

 31. 6 



33-6 



4-5 

 10. 9 

 13.6 



13-7 

 13.0 



13-9 

 14-4 

 17-3 

 17.2 



17-7 

 17.9 



18.3 

 17-9 



21. 4 



22. I 

 23-5 



23-9 

 27. o 



29- 7 

 30. 6 



33-4 

 34- o 

 35-2 

 38.7 

 39- I 

 42. o 



4. I 

 8.2 



II- 3 

 12. 2 

 14.8 

 12.5 



14. o 



14-5 



16. 9 



17. o 

 18.7 



18.5 

 18.8 

 22. 2 

 21.4 

 23-5 



2.9 



5-7 

 7-9 

 8-5 

 10. 4 

 8.8 



9.8 



10. 2 



11. 8 

 II. 9 



13- I 

 13.0 



13- 2 



15-5 

 15-0 

 16.5 



8.2 

 14. 6 



17-3 

 17.8 

 22.8 

 24.8 



29.4 

 27. 2 

 32.6 



33-9 

 36.0 



40. 7 



41. I 

 44- 7 

 44-4 

 49-3 



4-4 

 8.9 

 10. 4 

 10. 2 

 12.8 

 13-9 



14. 6 

 14. o 



16.5 

 16.6 

 18.7 

 20. 7 

 20. I 

 22.3 

 19.2 

 23.0 



3- I 

 6.2 



7-3 

 7- I 

 9.0 



9-7 



10. 2 

 9.8 



13- 

 14. 

 14. 

 IS- 

 13- 

 16. 



A comparison of the amount of amino nitrogen obtained by the Van 

 Slyke method with the amounts obtained by the electrometric and 

 colorimetric titrations was made. For this comparison bottles of 

 matured alfalfa silage and sweet-clover silage were used. The Van 

 Slyke determination was made in the usual way. The titrable nitrogen 



