DENITRTFICATION. 



23 



Fig. IC. — Diagram showing the relation between the quantity of alkali and the nitrification in samples of 

 soil from plats ISO, 190, 170, 100, 120, KiO, 110, and 150, Truckee-Carson Experiment Farm. Samples 

 taken from depths of 12 to 18 inches. 



Fir. 17.— Diagram showing the relation between the quantity of alkali and the nitrification in samples of 

 soil from plats l.so, 170, l!i0, 1(K), 110, ir.o, l.")0, and 120, Truckee-Carson Experiment Farm. Samples 

 taken from depths of 18 to 24 inches. 



211 



