450 Mineral Nutrition of Plants 



124. , Soil Sa'., 62:451 (1946). 



125. Volk, G. M., /. Am. Soc. Agron., 39:93 (1947). 



126. , and Bell, C. E., Soil Sci. Soc. Am. Proc, 12:188 (1947). 



127. Volk, N. J., Soil Sci., 37:267 (1934). 



128. Wadleigh, C. H., and Ayers, A. D., Plant Physiol., 20:106 (1945). 



129. Wadleigh, C. H., Gauch, H. G., and Magistad, O. C, U. S. Dept. 

 Agr. Tech. Bull. 925 (1946). 



130. Wadleigh, C. H., and Gauch, H. G., Plant Physiol., 23:485 (1948). 



131. Wallihan, E. F., Soil. Sci. Soc. Am. Proc, 2:259 ( 1937). 



132. Waksman, S. A., Principles of Soil Microbiology (2d ed., The Wil- 

 liams and Wilkins Company, 1932). 



133. Walsh, T., and Cullinan, S. J., Empire J. Exptl. Agr., 13:203 (1945). 



134. Willis, W. H., and Sturgis, M. B., Soil Sci. Soc. Am. Proc, 9:106 

 (1944). 



135. Wilson, B. D., and Richards, S. J., /. Am. Soc. Agron., 30:583 (1938). 



136. Wimmer, G., Sammet, K., and Lesch, W., Z. Wirtschajtsgruppc 

 Zuc/{erind., 94:2 (1944); Chem. Abstracts, 41:7033 (1947). 



