462 



Journal of Agricultural Research 



Vol. XIII. No. 9 



Table XI. — Percentage of total boron as boric acid in potatoes, corn, beets, and string 

 beans, dry basis, Bethesda, Md., 1915 



POTATOES 



Boric acid added to upper 6 inches of soil. 



Material. 



Solids. 



Total boron 

 as boric 



acid 

 found. 



Per cent. 



0.00176 as borax (16-ton plot). 

 0.00264 as borax (24-ton plot). 

 40- ton control plot 



fTops. . . 

 {Roots. . 

 [Tubers. 

 [Tops. .. 

 I Roots. . 

 [Tubers. 



I Tops. . . 

 Roots. . 

 Tubers. 



Per cent. 



19. II 



17. 01 



IS- 51 



Per cent. 



Trace, 

 o. 000320 

 . 000004 

 . 00 1 000 

 . 000280 

 . 000006 

 . 000500 

 . 000400 

 . 000004 



BEETS 



C.00176 as borax (16-ton plot). 

 0.00264 as borax (24-ton plot). 

 40-ton control plot 



[Tops. . 

 (Roots. 

 /Tops. . 

 \ Roots. 

 /Tops. . 

 (Roots. 



11-95 

 13- 45 

 10. .^6 



. 000002 



. 000022 

 . 000012 



STRING BEANS 



0.00176 as borax (i6-ton plot) 



C.0044 as borax (40-ton plot) 



0.00232 as coletnanite (i6-ton plot) . 

 0.0058 as colemanite (40-ton plot) . 



16-ton control plot , 



(Beans and pods . 

 Tops 

 Roots 



I Beans and pods . 

 Tops 

 Roots 



(Beans and pods . 

 Tops 

 Roots 



I Beans and pods . 

 Tops 

 Roots 



/Beans and pods . 

 (Tops 



11-39 

 18.77 

 27.44 

 12. 63 

 21. 06 

 32.08 

 10. 31 

 17.78 



30-49 

 10. 41 

 19.04 

 28.26 

 9. 04 

 19.81 



o. 00004 

 . 00040 

 . 00006 

 . 0000 1 

 . 00003 

 . 00006 

 . 0000 1 

 . 00012 

 . 00004 



. OOCOI 



. 0000 1 

 . 0000 1 

 . 00002 

 . 00008 



* Nitrogen results=i.39, 1.57, and 1.18 per cent, respectively. 



