104 METHODS OF DETERMINING ALKALI 



Directly in the Soil. Mich, Sta. lech. Bui. 24 (191 5), 44 PP-; also 

 Jour. Agr. Res. 15 (1918), pp. 33i~336. 



4. CAMERON, F. K. Estimation of Alkali Carbonates in the Presence of 



Hie :arbonates. Am. Chem. Jour. 23 (1900), pp. 471-486. 



5. Davis, R. O. E., and Bryan, H. The Electrical Bridge for the De- 



termination of Soluble Salts in Soils. U. S. D. A. Bur. Soils Bui. 61 



(1910), 36 PP- 



6. Greaves, J. E., and Hirst, C. T. Some Factors Influencing the Quan- 



titative Determination of Nitric Nitrogen in the Soil. Soil Sci. 4 



(1017)1 PP- i79- 20 3- 



7. Hare, R. F. A Review and Discussion of Some of the Methods for 



the Determination of Alkali Soils. N. Mex. Sta. Bui. 95 (1915), 

 pp. 7-16. 



8. Pittman, D. W. A Study of Methods of Determining Soil Alkali. 



Utah Sta. Bui. 170 (1919), 21 pp. 



9. Schreiner, O., and Failyer, G. H. Colorimetric, Turbidity, and 



Titration Methods Used in Soil Investigations. U. S. D. A. Bur. 

 Soils, Bui. 31 (1906), 160 pp. 



10. Skinner, W. W. A Method for the Determination of Black Alkali 



in Irrigating Waters and Soil Extracts. Jour. Am. Chem. Soc. 

 28 (1906), pp. 77-8o. 



11. Stewart, R., and Greaves, J. E. The Influence of Chlorine on the 



Determination of Nitrates by the Phenoldisulphonic Acid Method. 

 Jour. Am. Chem. Soc. 35 (1913), PP- 579 _ 5 82 - 



12. Vinson, A. E., and Catlin, C. N. Study of Methods Used in Alkali 



Determinations. Ariz. Sta. 24 Ann. Rpt. (1913). PP- 274-277. 



13. Wiley, H. W. Official and Provisional Methods of Analysis. U. S. 



D. A. Bur. Chem. Bui. 107 (Revised) (1908), pp. 272. 



