Sept. 4> 1916 Influence of Barnyard Manure on Soil Bacteria 923 



There was found to be a direct relationship between the bacterial 

 count, the ammonifying powers, the nitrifying powers, and the crop pro- 

 duced on a soil receiving no manure, 5 tons, and 15 tons of manure per 

 acre. 



A close correlation was also found to exist between the bacterial 

 activities of soil receiving varying amounts of water and crop produced 

 upon the soil. 



LITERATURE CITED 



(1) Barthel, Christian. 



19 14. Der Einfluss organischer Korper auf die Nitrifikation und die Denitrifika- 

 tion im Ackerboden. In Centbl. Agr. Chem., Jahrg. 43, Heft 6, 

 P- 37 2 -373- 



(2) BORNEMANN. 



1913. In welchem Masse tragen Stallmist und Griindungung durch Lieferung 

 von Kohlensaure zum Ernteertrag bei? (Abstract.) In Centbl. Bakt. 

 [etc.], Abt. 2, Bd. 41, No. 9/10, p. 290-291. 1914. (Original article 

 in Mitt. Deut. Eandw. Gesell., Jahrg. 28, Stuck 31, p. 443-445. 

 1913. Not seen.) 



(3) Briscoe, C. F., and Harned, H. H. 



1915. Bacteriological effects of green manures. Miss. Agr. Exp. Sta. Bui. 

 168, 20 p., 7 fig. 



(4) Brown, P. E. 



1913. Bacteriological studies of field sods. III. The effects of barnyard manure. 

 In Centbl. Bakt. [etc.], Abt. 2, Bd. 39, No. 20/22, p. 523-542. 



(5) Burgess, P. S. 



1913. The aluminum reduction method as applied to the determination of 

 nitrates in "alkali" soils. In Univ. Cal. Pub. Agr. Sci., v. 1, no. 

 4, p. 51-62, illus. 



(6) Caron, A. 



1895. Eandwirtschaftlich-bakteriologische Probleme. In Landw. Vers. Stat., 



Bd. 45, p. 401-418. 



(7) Coleman, L. C. 



1908. Untersuchungen iiber Nitrifikation. In Centbl. Bakt. [etc.], Abt. 2, 

 Bd. 20, No. 12/14, P- 401-420. 



(8) Dafert, F. W., and Boluger, R. 



1896. Conservation of farmyard manure. (Abstract.) In Jour. Chem. Soc. 



[London], v. 72, pt. 2, Abstracts, p. 590-591. 1897. (Original ar- 

 ticle in Relat. Ann. Inst. Agron. Sao Paulo, Brazil, v. 7/8, 1894/95 

 p. 175-186. 1896. Not seen.) 



(9) Deh£rain, P. -P., and Demoussy, E. 



1896. Sur l'oxydation de la matiere organique dusol. In Compt. Rend. Acad. 

 Sci. [Paris], v. 123, no. 5, p. 278-282. 



(10) Emmerich, Rudolf, Leiningen-Westerburg, W. T. E., Graf zu, and Loew, 



Oscar. 

 1911. liber schadliche Bakterientatigkeit im Boden und iiber Bodensauberung . 

 In Centbl. Bakt. [etc.], Abt. 2, Bd. 29, No. 23/25, p. 668-683, 2 

 fig., 2 pi. 



(11) Engberding, Diednch. 



1909. Vergleichende Untersuchungen iiber die Bakterienzahl im Ackerboden 

 in ihrcr Abhangigkeit von ausseren Einflussen. In Centbl. Bakt. 

 [etc.], Abt. 2, Bd. 23, No. 21/25, P- 569-642. 



