sept. 4, 1916 Influence of Barnyard Manure on Soil Bacteria 



897 



average counts from the pots receiving the same quantities of irrigation 

 water are with 12.5 per cent of water, 4,251,000; 15 per cent of water, 

 3,838,000; 17.5 per cent of water, 3,882,000; 20 per cent of water, 

 3,352,000; and 22.5 per cent of water, 3,680,000. 



TablB II. — Number of bacteria developing on synthetic agar and quantity of ammonia 

 and nitric nitrogen formed in 100 gin. of soil and of nitrogen fixed in lOOc. c. of Ashby 

 solution — pot experiments 



Treatment. 



12.5 per cent of water; no manure 



12.5 per cent of water; 5 tons of ma- 

 nure 



12.5 per cent of water; 10 tons of 

 manure 



12.5 per cent of water; 15 tons of 

 manure 



12.5 per cent of water; 20 tons of 

 manure 



12.5 per cent of water; 25 tons of 

 manure 



15 per cent of water; no manure 



15 per cent of water; 5 tons of manure . 



15 per cent of water; 10 tons of ma- 

 nure 



15 per cent of water; 15 tons of ma- 

 nure 



15 per cent of water; 20 tons of ma- 

 nure 



15 per cent of water; 25 tons of ma- 

 nure 



17.5 per cent water; no manure 



17.5 per cent of water; 5 tons of ma- 

 nure 



17.5 per cent of water; 10 tons of 

 manure 



17.5 per cent of water; 15 tons of 

 manure 



17.5 per cent of water; 20 tons of 

 manure 



17.5 per cent of water; 25 tons of 

 manure 



20 per cent of water; no manure 



20 per cent of water; 5 tons of manure . 



20 per cent of water; 10 tons of manure . 



20 per cent of water; 15 tons of manure . 



20 per cent of water; 20 tons of manure . 



20 per cent of water; 2 5 tons of manure . 



22.5 per cent of water; no manure . . . . 



22.5 per cent of water; 5 tons of ma- 

 nure 



22.5 per cent of water; 10 tons of 

 manure 



22.5 per cent of water; 15 tons of 

 manure 



22.5 per cent of water; 20 tons of 

 manure 



22.5 per cent of water; 25 tons of 

 manure 



