432 SOILS: PROPERTIES AND MANAGEMENT 



Number of Bacteria to a Gram of Soil during Some 

 Period of the Growing Season 



State 



Soil 



Depth 



Crop 



Investi- 



GATOB 



Number 



or 

 Bacteria 



Delaware . 



Stiff clay 



3 



inchcfe 



Orchard in high 

 state of culti- 

 vation. In 

 cover crops 



Chester ^ 



2,200,000 



Delaware . 



Adjoining soil above 



3 



Meadow for 



Chester i 



450,000 





and of same char- 



inches 



twelve years 









acter 











Delaware . 



Of same type as 



3 



Vegetables and 



Chester ^ 



1,800,000 





above 



inches 



heavily ma- 

 nured 







Delaware . 







Scarlet clover 



Chester ^ 



3,360,000 









plowed under 











and alter- 













nated with 













maize for ten 













years 







Kansas 



Loam, rich in humus 



30 



Alfalfa, five 



Mayo and 



33,931,808 







inches 



years 



Kinsley 2 





Kansas 



Loam, richer in hu- 



30 



Alfalfa 



Mayo and 



53,596,060 





mus than soil above 



inches 





Kinsley 2 





Kansas 



Thin soil, gumbo 



30 



Mixed grasses 



Mayo and 



78,534 





subsoil 



inches 





Kinsley *- 





Kansas 



Loam, low in humus 



30 



inches 



Oats and wheat 



Mayo and 

 Kinsley 2 



8,543,006 



Iowa . . 



Marshall loam, no 

 lime applied 



top 



soil 



Oats 



Brown ^ 



1,930,000 



Iowa . . 



Marshall loam, 1,000 

 pounds lime per 

 acre 



top 



soil 



Oats 



Brown ^ 



2,342,000 



Iowa . . 



Marshall loam, 2,000 

 pounds lime per 

 acre 



top 

 soil 



Oats 



Brown ^ 



2,787,000 



Iowa . . 



Marshall loam, 6,000 

 pounds lime per 

 acre 



top 

 soil 



Oats 



Brown ^ 



3,766.000 



1 Chester, F. D. The Bacteriological Analysis of Soils. 

 Delaware Agr. Exp. Sta., Bui. 65. 1904. 



2 Mayo, IJ. S., and Kinsley, A. F. Bacteria of the Soil. 

 Kansas Agr. Exp. Sta., Bui. 117. 1903. 



s Brown, P. E. Some Bacterial Effects of Liming. Iowa 

 Agr. Exp. Sta., Research BuL 2. 1911. 



