SUBJECT INDEX 



457 



Respiration: effects of carbon dioxide on plant 

 tissue, 403-406 



effects of chemicals on dormant potato tubers, 

 249-2.-)0, 251 



ethylene effects, 160 



of dormant gladiolus corms, 39 



of dormant seeds, 39 

 Rest period: {See Dormancy) 

 Rhizoclotiia tuHparum , 190, 197 

 Rhizopus Jiigricayts, 165 

 Rhodotypos. 89, 92, 93, 94, 98 

 Rhodotypos kerrioides, 93, 95, 98, 112, 130 

 Ribes, b\ 



Ripening: ethylene effects on fruits, 158-159 

 River maple: (See Acer saccharinum) 

 Robinia, 35, 38 

 Rooting: carbon monoxide effects, 161-164 



effects of growth substances, 209-215 



gases effects, 160-164 



methods of treating cuttings with growth sub- 

 stances, 213-215 

 Rootone effects on: germination of seeds, 419 

 Roots: ethylene effects, 172-176 



growth substances effects, 209-215 

 Rom, 89, 91, 159 

 Rosa rubiginosa, 89 

 Rose: carbon dioxide effects on flower color, 403 



niercurj^ effects, 183 

 Rudberkia, 35 

 Rumex: 35, 36, 37 



dormancy and water-absorption of seeds, 126 

 Ruppia marHima: 15 



sea-water tolerance, 20 



Sabal, 33 



Saint paulia: as affected by growth substances, 215 



Salix, 32 



Salvia, 150, 151 



Salvia officinalis: as an insecticide, 354 



Sanguinaria canadensis: 120, 121 



dormancy and germination of seeds, 120-121 

 Scirpus, 91 



Scirpus americanus, 101 

 Scirpus campestris, 101 

 Sclerotinia fructicola: 197 



effects of carbon dioxide on pH of hyphae, 401- 

 403 ■ 



effects of pentathionic acid, sulphuric acid and 

 hydrogen sulphide on spore germination, 

 363-366 



time and temperature effects on germination of 

 spores, 372 

 Sclerotium delphinii, 197 

 Scrophularia, 42, 76 



Sea-water concentration: titration studies, 16-20 

 Sea-water effects: on aquatic plants, 15-26 

 Sea- water tolerance: by aquatic plants, 20 

 Seed coats: effect on dormancy, 71-74 



effect on seed vitality, 51 



restricting oxygen supply to embryo, 80-85 

 Seed storage: citrus, 31-32 



dandelion, 57 



delphinium, 56-57 



drying effects, 32 



economic importance, 52 



humidity effects on vitality, 53-55 



importance of air conditioning, 60 



moisture effects, 31-33, 57-59 



optimum conditions, 28-29 



oxygen effects, 32, 56 



temperature effects, 31, 32, 55 



under controlled conditions, 52-60 

 Seed testing: quick vitality test, 128-131 

 Seedless fruit: as produced by growth substances, 



218-220 

 Seedling growth: effect of nitrogenous and carbo- 

 hydrate reserves, 436 



Seeds: after-ripening in dry storage, 12^5-127 

 causes of degeneration, 60-63 

 dormancy: {See Dormancy in seeds) 

 factors influencing pH equilibrium, 416 

 germination: {See Germination of seeds) 

 life span, 28-63 

 longevity, 28-63 

 quick vitality tests, 128-131 

 respiration: {See Respiration of seeds) 

 temperature effects on vitality, 55 

 two-year seeds, 106 

 vitality, 28-63 

 vitality of old seeds, 30-31 

 water absorption capacity, 5.3-55 

 with dormant embryos, St)-101 

 with non-dormant embryos, 101-105 

 with resistant coats and dormant embryos, 106- 

 112 

 Seeds in soil: life span, 33-41 

 Seeds of long life span: germination tests, 29-31 

 Seeds of .short life span: vitality, 31-33 

 Seeds of wild plants: dormancy and delayed ger- 

 mination, 41-43 

 Seeds, macrobiotic: germination tests, 20-31 

 Selenium: toxicity compared to sulphur, 365-366 

 Seploria lycopersici: use in greenhouse tests of fun- 

 gicides on tomato, 374-378 

 Sequoia, 91 

 Sequoia gigantea, 102 

 Setaria, 102 



Settling tower: method of applying fungicides, 374 

 Shade: effects on plants. 323-328 

 Shrubs: diagnosis of artificial illuminating ga.s in- 

 jury, 178-179 

 effect of illuminating gas, 172-176 

 Sida, 30 



Silver bell: (See Halesia) 

 Sinapis, 34, 40, 43 

 Sisymbrium, 43 

 Smilacina, 91 

 Smilacina racemosa: dormancy and germination of 



seeds, 120-123 

 Snapdragon rust: greenhouse method of testing 



fungicides, 379 

 Snowberry: (See Symphoricarpos racemosus) 

 Soaps, potassium: contact insecticides, 346 

 Sodium thiocyanate eft'ects: on enzyme activities in 



potato tubers, 250-251 

 Sodium vapor lamps: effects on plant growth, 293- 



296 

 Soil studies, 425-429 

 Soils: as affected by sulphur dioxide, 427-428 



sampling method, 438—139 

 Solanum, 35 



Solanum tuberosum: effects of carbon dioxide on 

 dormancy, 400 

 importance of mother-tuber in growth of potato 

 plant, 420-423 

 Solanum tuberostim tubers: critical storage tempera- 

 tures for sugaring and sprouting, 394 

 effects of carbon dioxide on respiration, 403-406 

 low temperature storage effects on sugars, 388- 



389 

 storage temperature effects on cane sugar con- 

 tent, 389, 390, 393 

 storage temperature effects on de-sugaring, 389- 



392 

 storage temperature effects on reducing sugar. 



392-394 

 sugar content at time of harvest, 388-389 

 varieties classified by sugar content, 388-389 

 Sorfrus, 89, 91,92, 93, 99 

 Sorbus aucuparia, 86, 87, 88, 99, 100, 130 

 Spectral glasses, effects: (See Quality of radiation 



effects) 

 Spore germination: effect of Bordeaux mixture, 366- 

 368 



