364 



Index 



truck crop, 238-244 ; early, 238 ; 

 formulas, late, 243, formulas, 

 roughage, 282. 



Potential fertility, 6. 



Poultry manure, 46, 125. 



Powder waste, 116. 



Power of plant to acquire food, 199. 



Practical fertility, 6. 



Previous treatment of soil, 195. 



Prices received for fertility ele- 

 ments in crops removed, 14. 



Pulse, crops, 296. 



Pumpkins, 299. 



Purchase of fertilizers: standard 

 high-grade materials, 154; va- 

 riable materials, 155 ; unit basis 

 of fertilizers, 157 ; ton basis of 

 fertilizers, 157 ; guarantee a 

 necessity, 158 ; relation of guar- 

 antee to selling price, 159; dis- 

 cussion, 162; raw materials vs. 

 mixed fertilizers, 165 ; home 

 mixtures, 167; formulas, 169; 

 general advice, 173. 



Rape, 278. 



Raspberries, 326. 



Raw bone, 63. 



Raw material vs. mixed fertilizers, 



165. 



Rhubarb, 304. 

 River phosphate, 69. 

 River rock phosphate, 69. 

 Rock phosphates, 69. 

 Root crops : characteristics, 202 ; 



for green forage, 279 ; for market 



garden, 289. 

 Roses, 354. 

 Rotation of crops, 209; gain in 



fertility in soil, 228. 

 Rye, 225 ; fertilizer constituents in, 



16 ; forage crop, 263 ; spring rye, 



264. 

 Rye grass, Italian, 269. 



Salt, 115, 



Sandy soils : imperfections, 194. 

 Seaweeds, source of potash, 100, 110. 

 Sewage, 107. 



Shallots, 291. 



Shell marl, 140. 



Slag, basic, 72 ; meal, 73. 



Soda, nitrate of, see Nitrate. 



Soft phosphate, 70. 



Soil fertility, see Fertility. 



Soiling crops, 275. 



Soils: derivation, guide to possible 

 imperfections, 192 ; clay, 194 ; 

 sandy, 194 ; influence of previous 

 treatment, 195. 



Solanaceous crops, 297. 



Soluble plant-food, danger of loss, 

 25. 



Sorghum, 352. 



South Carolina rock phosphates, 69. 



Soybean and cowpea, 271. 



Spinach, 294. 



Spring vetch, 272. 



Squash, 299. 



Standard high-grade materials, 153. 



Strawberries, 326. 



Sugar beets, 280, 343-347. 



Sugar cane, 347 ; Louisiana experi- 

 ments, 347. 



Sulfate of ammonia, 48. 



Sulfate of lime see Gypsum. 



Sulfate of potash, 97 ; on potatoes, 

 242. 



Superphosphates, 61, 82; process 

 of manufacture, 83 ; differences 

 in superphosphates, 84 ; phos- 

 phates vs. superphosphates, 85; 

 reversion, 87 ; double superphos- 

 phates, 89: "total available," 

 89 ; chemical composition, 90. 



Swedes, 281. 



Sweet corn, 305. 



Sweet potatoes, 244-248; rough- 

 age, 282. 



Systems of fertilizing: 1. based 

 upon the influence of a single 

 element, 204 ; 2. based upon 

 need of abundant supply of min- 

 erals, 205 ; see also " Use" of fer- 

 tilizers. 



Tanbark ashes, 111. 



Tankage, 40 ; garbage, 42 ; bone, 66. 



