Normal Soil and Its Requirements 9 



Sand 



plowed 4 inches deep increases the number of bacteria. .35.06% 

 plowed 6 inches deep increases the number of bacteria. . 13.53% 

 plowed 8 inches deep increases the number of bacteria . .22.90% 

 plowed 1 o inches deep increases the number of bacteria . . 5.11% 



The Influence of Manure on the Number of 



Soil Bacteria 



Besides cultivation, there are other treatments 

 which may lead to an increased bacterial flora in the 

 soil. As shown by Temple 1 such a result is obtained 

 through the application of manure. In working with 

 a newly cleared sandy loam, and applying fresh cow 

 manure (this included solid excreta and no bedding) , 

 at the rate of ten tons per acre, Temple obtained the 

 following results as shown in Table 3. 



Table 3 



Showing Number of Bacteria per Gram of Dry Soil 



Date 

 March 26, 1909 

 April I, 1909.. 

 April 9, 1909 . 

 April 15, 1909. 

 April 22, 1909. 

 April 29, 1909 . 

 May 6, 1909. . . 



As further evidence that manure increases the soil 

 flora, Temple used a clay loam, dividing it in the 

 following manner ; and treated as follows : 



1 Temple, J. C, Georgia Agr. Expt. Sta. Bui. 95 : 6-35, 191 1. 



