354 



Index 



Ps. fiiioresccns putidus, 167 

 Ps. zonatum, 271 

 Pseudomycorrhiza, 88 

 Pseudoparasitic fungi, 83 

 Pure humus, 125 

 Purple sulfur bacteria, 67 

 Putrefaction, 10, 15, 16, 73 

 Pijthium, 278, 287 



Radiobactcr, 60, 251, 255, 256, 257 

 Raw humus, 136, 144 

 Reaction, effect of, 179, 180, 181, 

 186, 301 

 of soil, 331 

 Reduction of nitrates, 186 

 Reducti\e deaminization, 167 

 Remy-Lohnis solution method, 325 

 Rhizobium, 217, 218, 219, 220, 224 

 Rh. japonicum, 217 

 Rh. leguminosurum, 38, 200, 217 

 Rh. lupini, 217 

 Rh. meliloti, 217 

 Rh. phaseoh, 217 

 Rh. radicicola, 217 

 Rh. trifolii, 111 

 Rhizoctonia, 79, 278, 292 

 Rh. solani, 288, 290, 294 

 Rhizopoda, 90 

 Rhizopus, 83, 119, 264 

 R. ingricans, 269, 289 

 Rhizosphere, 70, 247-250 

 Rhodococcus cinnebareus, 268 

 R. roseus, 268 



Roman writers, 7, 11, 14, 208 

 Root infection, 212 

 Root-inhabiting fungi, 84 

 Root-nodule bacteria, 191 

 Root region, 247 

 Root rots, 301 



Roots, effect on microorganisms, 248 

 Rossi-Cholodny techniciue, 25, 295 

 Rotation of crops, 77, 90 

 Russell, Sir John, 22 

 Russula amoena, 86 

 R. maculata, 86 



Rye plants, composition ot, 100, 104 

 Rye straw, decomposition of, 156, 

 178 



Succharomyces eUipsuideus, 268 

 Sac. murianus, 268 

 Sac. pastorianus, 268 

 Salmonella enteriditis, 268 

 Sal. pullorum, 268 

 Sal. suipestifer, 268 

 Sarcina lutea, 167, 268 

 Sarcodina, 90 

 Schloesing, J. J. T., 14 

 Sclerotinia trifoltorum, 287, 288 

 Sclewtium rolfsii, 78, 278, 291 

 Scopulariopsis brevicaule, 243 

 Season of year, effect of, 49 

 Selenium transformation, 243 

 Serratia marcescem; 172, 268, 270 

 Shigella galliuanim, 285 

 S/i. parady.senferiac, 268 

 S/i. pullorum, 285 

 "Sick" soils, 69, 91, 256 

 Silicon transformation, 244 

 Simple mycorrhiza, 87 

 Smuts in soil, 287 

 Soil, as li\ing system, 337, 340 

 composition of, 7 

 conserxation of, 327 

 fertility of, 17, 18, 87-91, 323- 

 335 



Soil aggregation, 326 



Soil atmosphere, 164, 165 



Soil chamber, 44 



Soil-enrichment methods, 51 



Soil-inhabiting fungi, 84 



Soil inoculants, 301, 330 



Soil methods, 32 



Soil plate, 43 



Soil processes, 344-345 



Soil reaction, effect of, 286 



Soil sterilization, 296 



Solution methods, 32 



Space antagonism, 274 



Spirillum desulfuricans, 72 



Spirochaeta cytophaga, 76, 77, 115 



Spirochaetales, 60 



Spore-forming bacteria, 68-69 



Sporotricha, 86 



Sporotrichum, 86, 328 



Sp. olivaceum, 86 



Sporovibrio desulfuricans, 72, 234 



Sjiorozoa, 91 



