46 University of California Publications in Agricultural Sciences [Vol. 1 



Table VI. Effects of Calcium and Magnesium Carbonates on the 

 Nitrification of Dried Blood 



Xitrate nitrogen 

 Treatment found mgs. 



None 14.5 



1.0 Gram Calcium Carbonate 23.5 



2.0 Gram Calcium Carbonate 19.2 



4.0 Gram Calcium Carbonate 21.2 



8.0 Gram Calcium Carbonate 20.2 



0.1 Gram Magnesium Carbonate 3.6 



0.2 Gram Magnesium Carbonate 2.9 



0.4 Gram Magnesium Carbonate 2.8 



0.8 Gram Magnesium Carbonate 5.1 



1.0 Gram Magnesium Carbonate 1.0 



2.0 Gram Magnesium Carbonate 2.0 



4.0 Gram Magnesium Carbonate 2.9 



8.0 Gram Magnesium Carbonate 3.3 



Original soil 5.0 



It will be observed that while approximately a 50 per cent 

 stimulation in nitrate formation was effected by the addition of 

 calcium carbonate, nitrification was totally inhibited by the addi- 

 tion of one-tenth of one gram of magnesium carbonate. Before 

 further discussing these results the data obtained from the 

 effects of calcium and magnesium carbonates acting synchron- 

 ously will be presented. 



Table VII. The Lack op Antagonism Between Calcium and Magnesium 

 Carbonates as Shown in the Nitrification of Dried Blood 



Nitrate nitrogen 

 Treatment found mgs. 



None 14.5 



1.0 gram Calcium Carbonate 23.5 



0.1 gram Magnesium Carbonate 3.6 



0.1 gram Magnesium Carbonate and 1. gram Calcium Carbonate 4.1 



0.1 gram Magnesium Carbonate and 2. gram Calcium Carbonate 3.4 



0.1 gram Magnesium Carbonate and 3. gram Calcium Carbonate 2.6 



0.2 gram Magnesium Carbonate and 1. gram Calcium Carbonate 1.9 



0.2 gram Magnesium Carbonate and 2. gram Calcium Carbonate 1.4 



0.2 gram Magnesium Carbonate and 3. gram Calcium Carbonate 2.0 



0.4 gram Magnesium Carbonate and 1. gram Calcium Carbonate 2.2 



0.4 gram Magnesium Carbonate and 2. gram Calcium Carbonate 1.8 



0.4 gram Magnesium Carbonate and 3. gram Calcium Carbonate 3.1 



0.8 gram Magnesium Carbonate and 1. gram Calcium Carbonate 2.9 



0.8 gram Magnesium Carbonate and 2. gram Calcium Carbonate 3.5 



0.8 gram Magnesium Carbonate and 3. gram Calcium Carbonate 4.1 



