604 STATE BOARD OF AGRICULTURE. 



References. 



(1) Briggs, L. J., and Breazeale, J. F. 1917. Availability of the potash 



in certain orthoclase bearing soils as affected by lime or gypsum. 

 In Jour. Agr. Res. v. 8, No. 1, p. 21. 



(2) Breazeale, J. F., 1917. Formation of "Black alkali" (sodium car- 



bonate) in calcareous soil. In Jour. Agr. Res. v. 10, No. 11, p. 

 541. 



(3) Burd, J. S., 1918. . Water extraction of soils as criteria of their 



crop producing power. In Jour. Agr. Res. v. 12, No. G, p. 297. 



(4) Bradle}', C. E., 1910. The reaction of lime and gypsum on some 



Oregon soils. In Jour. Indus. Engin. Cheni. v. 2, No. 12, p. 

 529-530. 



(3) Bouyoucos, G. J. and McCool, M. M., 1915. The freezing point 

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(G) Bouyoucos, G. J. and Laudeman, W. A., 1917. The freezing point 

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 Agr. Expt. Sta. Tech. Bui. No. 37. 



(7) Collinson, S. E. and Walker, S. S., 191G. Loss of fertilizers by 



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(8) Curry, B. E. and Smith, T. O., 1914. Granitic soil potassium and 



its relation to the production of hay. N. Hamp. Agr. Expt. Sta. 

 Bui. No. 170. 



(9) Cameron, F. K. and Bell, J. M., 1907. The action of water and 



aqueous solutions upon soil phosphates. U. S. Dept. Agr. Bur. 

 Soils, Bui. No. 41. 



(10) Cameron, F. K. and Bell, J. M., 1907. The action of water and 



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 Soils, Bui. No. 49. 



(11) Fraps, G. S., 191G. The effect of additions on the availability of 



soil potash and the preparation of sugar humus. Texas Agr. 

 Expt. Sta. Bui. No. 190. 



•(12) Greaves, J. E., 1910. Effects of soluble salts on insoluble phos- 

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(13) Gaither, E. W., 1910. The effect of lime on the solubility of the 



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(14) Hoagland, D. R., 1918. The freezing point method as an index of 



variations in the soil solution due to season and crop growth. 

 In Jour. Agr. Res. v. 12, No. G, p. 3G9. 



(15) Hartwell, B. L. and Kellogg, J. W., 1905. The phosphoric acid 



removed by crops, by dilute nitric acid and by ammonium 

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