THE SOIL AS A CULTURE MEDIUM 



037 



TABLE 68 

 Optimum and limiting reactions for the activities of microorganisms 



ORGANISMS 



Nitrosomonas 



Nitrobacter 



Nitrification in soils 



Thiobacillus denilrificans . . 

 Th. thiooxidans 



Bac. pycnoticus 



Bac. amylobacter 



Azotobacter 



Bad. radicicola of 



Medicago and Melilotus.. 



Pisum and Vicia 



Trifolium and Phaseolus. 



Soja 



Lupinus 



Bact. coli 



Bad. vulgare 



Bact. pyocyaneum 



Bact. stutzeri 



Bac. subtilis 



Bac. pulrificus 



Act. scabies 



Mucor glomerula 



Asp. terricola 



Pen. italicum 



Fus. oxysporum 



Asp. niger 



Gibberella saiibinetii . : 



Spore germination of fungi. 

 Protozoa: 



Paramoccium 



Colpidium 



ALKALI 

 MAXIMUM 



pH 



9.7 



13.0 

 >11.9 



10.75 



6.0(?) 



9.2 

 8.8-9.2 



11.0 



7.8 

 8.4 

 8.0 



9.6-9.* 

 9.4 

 8.5 

 8.7 



8.7- 9. 



9.0- 9. 



9.1- 9. 

 9.2-11. 



11.7 



9.0 



Gaarder and 

 Hagem 



Meek and Lipman 



Gerretsen, Waks- 

 man 



Trautwein 



Waksman and 



Starkey 



Ruhland 



Dorner 



Gainey, Johnson 

 and Lipman, 



Yamagato and 

 Itano, Stapp 



Fred and Daven- 

 port, Fred and 

 Loomis, Bryan 



Dernby 



Dernby 



Dernby 



Zacharowa 



Itano 



Dernby 



Gillespie, Waksman 



Johnson 



Terroine and 



Wurmser 

 Maclnnes 

 Webb 



Cutler and Crump 



