1905.] Function of Silica in the Nutrition of Cereals. 459 



of the grain, and particularly in that of the straw, indicating that under the 

 ordinary soil conditions the barley plant does not obtain all the soluble silica 

 it would otherwise appropriate. 



Table III.— Hoos Field Barley. 



Nitrogen and Pure Ash per cent, in Dry Matter, and Phosphoric Acid and 



Silica in Pure Ash. 





Nitrogen. 



Nitrogen and 

 phosphate. 



Nitrogen and 

 potash. 



Nitrogen, 

 potash, and 

 phosphate. 



Only. 



With 

 silica. 



Only. 



With 

 silica. 



Only. 



1 



With 

 silica. 



Only. 



With 

 silica. 



1. 



IS. 



2. 



2S. 



3. 



3S. 



1 



4S. 











Grain. 













1903— 























Nitrogen in dry matter... 



1 63 



1 



•57 



1 -50 



1-50 



1 -59 



1 -61 



1 -53 



1 -54 



Pure ash ,, 



1 



•74 



1 -98 



2-27 







1 "96 



2 "36 



2 -36 



Phosphoric acid in pure 

 ash 



35 



•80 



37-74 



42-27 



42 '64 



35 '54 



36 "11 



41 "83 



44 "31 



Silica in pure ash 



14 -19 



18 



•67 



; 16-43 



20 '60 



15 "81 



18 "00 



16 "95 



19 "71 



~T"1 j " "l > i~\ j _ "V*" 



Katio, ir-iO; to J\ 







•38 



0-48 



0-64 









"64 



'68 



1904— 























Nitrogen in dry matter... 



1 



•79 



1 



•72 



1-52 



1-46 



.1-58 



1-73 



1 -46 



1-45 



Pure asli „ 



1 -94 



2 



■09 



2 -34 



2-41 



1 -97 



2-15 ! 



2 33 



2 -32 



Phosphoric acid in pure 

 ash 



32 



19 



35 



•29 



40-16 



36-40 



30 96 



34 -16 



38 -82 



38 -46 



Sdiea in pure ash 



16 -76 



20 



13 



19 -62 



20-75 



16 -45 



17-47 



16 -34 



19-08 



Eatio. P.,0, to N 







•35 







•43 



0-62 



0-60 



0-39 



0-42 



0-62 



62 













Straw. 













1903— 

















1 



1 





Nitrogen in dry matter... 







•53 







•43 | 



0-43 



0-41 1 



0-56 



0-50 i 



0-42 



0-44 



Pure ash ,. 



3 



•66 



4 



•80 i 



3-71 



4-86 



4-24 



4-82 : 



3-98 



4-73 



Phosphoric acid in pure 

 ash 



2 



•34 



2 



■40 j 



4-18 



3 62 



2 -41 



2 19 



4-02 



4-38 



Silica in pure asli 



51 



•98 



63 



•88 



56 -67 



64-00 



46-22 



55 -37 



48 -14 



57 -30 



Eatio, P-0 5 to N 







•16 







■27 



0-36 



0-43 



o-is 



0-22 



0-38 



0-48 



1904— 























Nitrogen in dry matter... 







•49 







-48 



0-40 



0-42 



0-50 



0-48 



43 



0-45 



Pure ash „ 



4 



•07 



5 



•00 



4-36 



5 -09 



4-61 



5 29 



4-19 



5-01 



Phosphoric acid m pure 



2-66 



2 -13 



4-47 



4-17 



2 -48 



2-02 



4-78 



3 96 



ash 























Silica in pure ash 



44 -00 



52 54 



47 -19 



51 -28 



35 -91 



44-07 



37 43 



44 -13 



Eatio, P 2 5 to N 







•21 







•23 



0-49 



0-51 



• 



23 



-22 



0-47 



1 



0-44 



As the application of a soluble silicate lowers the proportion of phosphoric 

 acid in the straw while raising it in the grain, it would seem at first sight to 



