116 PLANT PHYSIOLOGY 



REFERENCES 



Adams, H. R. — Some effects of sulphur on crops and soils. Soil Sci., 18:111, 



1924. 

 Beaumont, A. B. — Concentrated fertilizers,— theory and practise. Amer. 



Fertilizer, 64:23, 1926. 

 Brenchley, W., and Warington, K— Role of boron in the growth of plants. 



Ann. Bo*., 41:167, 1927. 

 Burke, E. — Chlorosis of trees. Plant Physiol, 7:329, 1932. 

 Eckerson, S. H. — Influence of phosphorus deficiency on the metabolism of 



the tomato. Contr. Boyce Thompson Inst., 3:197, 1931. 

 Gericke, W. F — Salt requirements of wheat at different growth phases. 



Bot.Gaz., 80:410, 1925. 

 Haas, A., and Reed, H. S. — Significance of traces of elements not ordinarily 



added to culture solutions for growth of young orange trees. Bot. Gaz., 



83:77, 1926. 

 Hackh, I.— The bioelements. Jour. Gen. Physiol, 1:429, 1919. 

 Hartt, C. E. — Potassium deficiency in sugar cane. Bot. Gaz., 88:229, 1929. 

 Johnston, E. S. — Growing plants without soil. Smithsonian Inst. Pub. 



No. 3156, 1932. 

 Johnston, E. S., and Fisher, P. L. — The essential nature of boron to the 



growth and fruiting of the tomato. Plant Physiol, 5:387, 1930. 

 Knight, R. C. — Potassium and aluminum. Sci. Prog., 21:418, 1927. 

 Lipman, C. B. — The chemical elements indispensable to plants. Sci. Mo., 



26:289, 1928. 

 Livingston, B. E., and Tottingham, W. E.— A new three-salt nutrient solu- 

 tion for plant cultures. Am. Jour. Bot., 5:337, 1918. 

 McClean, F. T., and Gilbert, B. E.— The relative aluminum tolerance of 



crop plants. Soil Sci., 24:163, 1927. 

 McH argue, J. S., and Calfee, R. K— Effect of boron on the growth of 



lettuce. Plant Physiol, 7:161, 1932. 

 Mirasol, J. — Aluminum as a factor in soil fertility. Soil Sci., 10:153, 1920. 

 Morris, H. S — Physiological effects of boron on wheat. Bull. Torr. Bot. Club, 



58:1, 1931. 

 Nightingale, G. T., Schermerhorn, L. G., and Robbins, W. R.— Effects of 



sulphur deficiency on metabolism in tomato. Plant Physiol, 7:565, 1932. 

 Pickering, S. U. — The effect of one crop on another. Jour. Roy. Hort. Soc, 



43:372, 1919. 

 Richards, M. B. — Manganese in relation to nutrition. Biochem. Jour., 24:1572, 



1930. 

 Samuel, G., and Piper, C. S— Manganese as an essential element for plant 



growth. Ann. Appl. Biol, 16:493, 1929. 

 Smith, T. O., and Butler, O— Relation of potassium to growth in plants. 



Ann. Bot., 35:189, 1921. 

 Sommer, A. L. — Copper as an essential for plant growth. Plant Physiol, 



6:339, 1931. 

 Thatcher, R. — The effect of one crop on another. Jour. Am. Soc. Agron., 



15:331, 1923. 



