INDEX 



383 



Rain, nitrogen contained in, 29 



Rape dust, 94, 240, 248, 345 



Recovery of nitrogen in crop, 99, 

 210 



Residues from manufactories, 67 ; 

 compensation for manuriai, 354 ; 

 duration of manuriai, 71, 96, 98, 

 212 



Retention of fertilisers by soil, 148, 

 164 



Reverted phosphate, 106, 126 



Ripening caused by phosphatic 

 manures, 136 



Rochdale manure, 245 



Rock salt, 159 



Roman agriculture, 2, 250 



Roots, development of, with nitro- 

 genous manures, 65 ; effect of 

 phosphatic manures on, 139; 

 ratio of, to leaf, 85 ; solvent action 

 of, 290 



Root system, importance of, 280 



Rotations, 32, 293, 301, 319 



Rothamsted, analysis of soil, 20 ; 

 experiments, 9, 13, 26, 277, 360; 

 grasB plots at, 65 



Russell, dung-making experiments, 

 199 ; on heated soil, 298 ; com- 

 position of seaweed, 75 



Rye, manures for, 312 



Sachs, 272, 290 



Sainfoin, manures for, 325 



Sale of fertilisers, 349 



Salt, 262, 268, 319; gunpowder, 



269 ; nitrate of, 51 

 Sampling of fertilisers, 349 

 Saussure, nutrition of the plant, 6, 



17, 276 ; on ammonia, I2 ; on 



phosphate of lime, 104 

 Scabby potatoes, 321 

 Schubler, theory of manures, 7 

 Schneidewind, 192, 202 

 Sclerotinia disease, 34, 297 

 Season, effect of, on yield and 



quality, 67, 83 

 Seaweed, 75 

 Secular decline in yield of crops 



grown continuously, 296 

 Selective action of plant, 19 

 Senebier, assimilation, 6, 276 

 Sewage, 245 ; sludge, 246 

 Sheep, composition of excreta of, 181 



Shoddy, 71, 334 



Short manure, 190, 205 



Sickness of land, 297 



Silica, action of, on plants, 271 



Skin, 12, 71 



Slaked lime, 251 



Slaughter-house refuse, 13, 70 



Sodium perchlorate, 51 j salts, 

 action of, 53, 170 



Solubility of phosphatic manures, 

 143 ; soil phosphates, 285 



Soil, acidity, 62 ; analysis of Rotham- 

 sted, 20; condition in, 210; ino- 

 culation of, 36 ; phosphates in, 

 144 ; temperature, 69 ; texture 

 affected by manures, lOl, 163, 

 176, 216, 269, 273; requiring 

 potash manures, 177 



Somme phosphates, 116 



Sonne, Danish barley experiments, 

 366 



Sorrel, 254 



Soot, II, 68, 307 



Sprengel, theory of manures, 7 



Spurrey, 254 



Stassfurt deposits, 13, 159 



Steamed bone flour, 109, 145, 1 52 



Stickstoff-kalk, 42 



Stohmann, water cultures, lO 



Straw, composition of, 182 



Stimulus due to manganese salts, 271 



Sugar cane, manures for, 336 



Sulphuric acid, as an ammonia- 

 fixer, 202 ; in manures, 74 



Superphosphate, 106, 1 19; as an 

 ammonia-fixer, 202 ; retention by 

 soil, 148; use of, 150; value in 

 Australia, 140 



Swede turnips and nitrogenous 

 manures, 90, 280, 312 



Surface tension of dung solutions, 

 221 



Sylvinit, 161 



Systems of manuring, 300 



Tafla, 47 



Tankage, 238 



Tares as green manure, 272 



Tea, manures for, 337 



Temperature of soil raised by soot, 



69 

 Tetra-basic phosphate of lime, 106, 



131, 143 



