905 



Skin disease of hyacinths 451-53 



Slime 198 



Slime cork 279 



— exudation of trees 854-55 



Slope of the soil surface- 86-120 



Slopes, Too steep 89-91 



Small fruits. Dropsy 335-38 



Smelters. Smoke 738. 740 



Smoke. Chemical composition 738-39 



— Gases 718-36, 884 



— Soil poisoning 722 



Smoke as cause of disease 49, 459 



predisposition to disease 722 



Smoke Commissions, Federal 744 



Smoke injuries. Acute 721 



Chronic 721 



Invisible 721 



Smoke injuries with calcium fertiliz- 

 ation •/22 



— production in smelting furnaces. . .738 



Smudges as protection against frost 628 



Snow covering 76, 634 



as protection against frost 624 



Snow pressure 634-37 



Soaking of seed. Advisability 295 



Soda dust 743 



Sodium chlorid 266 



content of sewage disposal 



beds 750 



fertilization 193 



in waste water 748-51 



— fumes 



— nitrate. See Nitrate of soda. 



— sulfid 



Soil. Absorption due to chemico- 



physical processes 264-68 



— Acid content 240-41 



— Aeration 241 



— Alkalinity 367 



— "Baking" 405 



— Breaking up 183 



— Chemical constitution. Unfavor- 



able 264-407 



— Covering with silt I9I-94 



— Crust formation no 



— Cultivation 183-84, 226, 234, 245 



— Feeding Cultures 142 



— Flocculency 193 



— Harrowing 184 



— Hoeing 184 



— Impoverishment 91, 238, 266 



due to fertilization 266 



— Increased density due to washing.. 748 



— Irrigation 182-83 



— Lack of moisture 182 



— Leaching 243 



— Mechanical resistance 141 



— Mulching 184-85 



— Physical constitution, Unfavor- 



able 138-263 



— Poisoning 266 



from metallic sulfur 250-51 



from smoke 722 



— Pulverization 191 



— Reduction 190 



— Removal of turf 184 



742 



741 



Soil. Shading due to weeds 658 



— Slope of the surface 72, 86-91 



— Use of a plant cover 185-86 



Soil, Alkali 195, 267 



— Compact. Improvement 194-95 



— Dry. Suitable fruit varieties. .. 174-75 



— Favorable for Cassava 232 



for sweet potatoes 22,2 



for Taro 232 



for yams 232 



— Heavy. Overcoming dis- 



advantages of 232-40 



— Lean 1 52 



— Light 148-89 



- — Loamy 189-240 



— Marshy, causing root decay 196 



— Moor. See Moor soil. 



— Peaty 185 



— Sandy. Capacity for becoming wet 



with dew 149 



Danger from frost i-;9 



Disadvantages 148-50 



— — Leaching 149, 243 



— Unfavorable for cocoa 230 



for cofifee 230 



for cotton 229 



for maise 231 



for millet 232 



for Pennlsetum spicatum 232 



for Sorghum 231 



for sugar 227 



for tea 231 



for tobacco 229-30 



• for tropical plants 22-], 232 



— Unripe 272 



— Virgin. Mosaic disease less pre- 

 valent on 687 



Soil bacteria 256, 269 



— conditions causing disease 72-407 



— encrustation 134, 405 



— exhaustion 265, 271 



— heat. Influence of excessive. 73, 648-50 



— in pot cultures 140 



— ■ mass. Limited T38-47 



— organisms. Work 268-74 



— ripening 2-7:^ 



— solution. Effect of too high con- 



centration 387 



— structure. Relation of food sub- 



stances 264-74 



Unsuitable 148-240 



— surface. ]\Iulching 235 



— — Slope 86-120 



— warmth. See Soil heat. 



Solidago virga aurea 84 



Soot. Composition 738 



— Injuriousness 737 



Sorghum. Unfavorable soil 231 



Sorghum millet. Mafufa disease 415 



Sorrel. Indication of scarcity of lime.. 237 



Souring of seed 201-203 



South wind. Destructive 636 



Specific gravity in seeds 295 



Specks. Brown, on foliage of potatoes. .297 



Sphacelus 608-13 



Sphaerocarpus 53 



