Sept. 17, 191 7' Effect of Applications of Boron on Wheat 



593 



for 1916 on all plots. It is apparent that during 1914 and 1915, when 

 there was a good growth on all plots, the borax had reduced the yield 

 of grain over that of the manured control. The yields of grain from the 

 borax plots both years were in excess of the yields from the unmanured 

 control. The colemanite had little, if any, influence on the yields. 

 During 1916, which was a poor year for wheat in this vicinity, the results 

 do not show any effect of the boron. There was no apparent cumulative 

 action of the boron in the soil. The yields of grain the first two years 

 from the borax plots were 12 to 14 pounds under that of the manured 

 control, while the third year (191 6) the yield was 7 pounds more than 

 that of the manured control. 



ANALYSES OP STRAW AND GRAIN 



In Table II are given results of the analyses of samples of straw and 

 grain each year from all the plots. Water, ether extract, and nitrogen 

 were determined by the methods of the Association of Of^cial Agricul- 

 tural Chemists.^ The boric acid was determined in the straw and grain 

 by the method described by the senior author (3, p. 879),^ who used 

 strips of paper dipped in an alcoholic solution of curcumin and compared 

 the resulting color with that from standard solutions of boric acid. 



TabIvE II. — Analyses of wheat straiv and grain grown on plots fertilized for three years 

 with manure containing added borax and colemanite, at Arlington, Va. 



1 Wiley, H. W., ed. Officlai, and provisionai, methods of analysis, Association of Officiai, 

 Agricultural Chemists. As compiled by the committee on revision of methods. U. S. Dept. 

 Agr. Bur. Chem. Bui. 107 (rev.), p. 38-39. 1908. 



' Reference is made by number to 'Literature cited ", p. 597. 



