Sept. 17, 1917 Effect of Applications of Boron on Wheat 597 



More boron was absorbed by the plants from the borax than from 

 the colemanite plots, although only minute amounts of boron were 

 absorbed by any of the wheat plants. The 191 6 samples of straw and 

 grain contained more boron than the 191 4 and 191 5 samples. In all 

 samples a relatively uniform distribution of boron in the straw and 

 grain was found. 



A yellowing of the young plants was observed the first year (191 4) on 

 the borax plot. This directly followed a heavy application of borax 

 manure to the plot, and the sample of soil from this plot taken nine 

 months later showed the presence of soluble boron. In no other soil 

 sample was any soluble boron found. Apparently the added borax is 

 gradually combined in an insoluble compound and so distributed that 

 the upper 6 inches of soil show little total boron after three yearly 

 additions of borax. There were no evidences of any cumulative action 

 of boron in the soil. It was apparently the soluble boron, not the total 

 boron, in the soil that produced injury to the wheat plants. 



LITERATURE CITED 

 (i) Agulhon, H. 



I910. RECHERCHES SUR LA PRE;sENCE ET LE r6lE DU bore CHEZ LES 



v6g6taux. 163 p., 6 pi. Paris. 



(2) American Public Health Association. 



i912. standard methods for the examination of water and sewage. 

 144 p. New York. Bibliography, p. 70-74, 137-140. 



(3) Cook, F. C. 



1916. boron: ITS ABSORPTION AND DISTRIBUTION IN PLANTS AND ITS EFFECT 



ON GROWTH. In Jour. Agr. Research, v. 5, no. 19, p. 877-890. Lit- 

 erature cited, p. 889-890. 



(4) FoLiN, Otto, and McCallum, A. B. 



I912. ON THE DETERMINATION OF AMMONIA IN URINE. In Jour. Biol. Chem., 



V. II, no. 5, p. 523-525. 



(5) Nakamura, M. 



1903. can boric acid in high dilution exert a stimulant action on 

 PLANTS? In Bul. Col. Agr., Tokyo Imp. Univ., v. 5, no. 4, p. 509-512, 

 pi. 28. 



(6) VoELCKER, J. A. 



I915. THE INFLUENCE OF BORON COMPOUNDS ON WHEAT AND BARLEY. In 



Joiu:. Roy. Agr. Soc. England, v. 76, p. 347-363, 10 pi. 



