1. Dible, W. T., Truog, E. and Berger, K. C., Boron determination in soils and plants Anal. Chem.26, 418 (1954).
2. Eaton, F. M., Deficiency, toxicity and accumulation of boron in plants. J. Agr. Research69, 237 (1945).
3. Gauch, H. G. and Dugger, W. M., The physiological action of boron in higher plants. Univ. Maryland Agr. Exp. Sta. Bull. A.80 (1954).
4. Hewitt, E. J., Sand and Water Culture Methods Used in the Study of Plant Nutrition, p. 111. Commonwealth Agr. Bureaux (1952).
5. Humphries, E. C., Effect of quality of light on development of roots on dwarf bean hypocotyls in presence and absence of boron. Nature190, 701 (1961).