864 



Journal of Agricultural Research 



Vol. VI, No. 22 



so 



45 

 40 

 35 

 30 

 25 

 20 

 /5 

 /O 

 05 

 OO 



/ 



4 5 6 



3 /O 



/ 2 3 4 5 6 7 3 3 /O 



<SFS?/£IS MUMB&PS 



Fig. 3. — Diagram of the percentage of sodium carbonate added to trie loam soil in experiment 3 (1915), with 

 the percentage of carbonate and bicarbonate recovered, and green weight of wheat. The solid black line 

 on the left at each series number indicates the percentage of sodium carbonate added to the soil; the 

 line at the right shows the percentage recovered at the end of the experiment. The solid portion of 

 the line shows the carbonate and the hatched portion the bicarbonate. The curve at the right of the 

 figure shows the relative growth of the plants in each series of pots. 



.40 



^.25 

 \*> 



%/o 



.OO 



/ 



4 5 6 



7 <9 S / 2> 3 4 5 

 FEME'S /VL/MSE/?S^ 



Fig. 4. — Diagram of the percentage of sodium carbonate added to Monterey sand in experiment 3 (1915), 

 with the percentage of carbonate and bicarbonate recovered and the total green weight of wheat ob- 

 tained. The solid black line on the left at each series number indicates the percentage of sodium car- 

 bonate added to the soil; the line at the right shows the percentage recovered at the end of the experiment. 

 The solid portion of the line shows the carbonate and the hatched portion the bicarbonate. The curve 

 at the right of the figure shows the relative growth of the plants in each series of pots. 



