406 



STATE BOARD OP AGRICULTURE 



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 c.c. OJ A/ E^w\^. 



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Fig. 7. — Titration curves — sandy loam soil. 



Curve No. 0. Initial titration curve, Ca(OH)2. 



No. 1. After standing one day, Ca(OH)2. 



" No. 2. After standing two days, Ca(0H)2. 



No. 3. Back titration of Ca(OH)2 series with HCl. 



No. 4. Initial titration curve, HCl. 



No. 5. After standing one day, HCl. 



No. 6. Back titration of HCl series with Ca(0H)2. 



