VI CONTEXTS 



CHAPTER VII- Phosphates 70-79 



Bones. Raw Bone-Meal. Steamed Boiie-Meal. De- 

 gree of Fineness. Bone-Black. Bone-Asli. Bone 

 Tankage. Dry Ground Fish. Mineral Phosphates. 

 South Carolina Phosphates. Florida Phosphates. 

 Tennessee Phosphates. Canadian Apatite. Rodunda 

 Phosphate. Basic Slag. Phosphatic Guanos. Classifi- 

 cation of Phosphates. Form of the Phosphates. 

 Availability of the Phosphates. 



CHAPTER VIII— vSuperphcsphates and Effect of Phos- 

 phoric Acid 80-89 



Manufacture of Super or Acid Phosphate. Phosphates 

 of Lime. Insoluble Phosphoric Acid. Soluble Phos- 

 phoric Acid. Reverted Phosphoric Acid. Basic Slag 

 Phosphate. Value of Reverted Phosphoric Acid. Dif- 

 ference Between Phosphate and Superphosphate. 

 Names Applied to Superphosphates. Available Phos- 

 phoric Acid. The Difference in the Forms of Phosphoric 

 Acid in Superphosphates. Some People F'avor Bone 

 Superphosphates. Double Superphosphates. No Free 

 Acid in Treated Phosphates. The Color of an Acid 

 Phosphate. How to Made Superphosphate at Home. 

 Amount of Phosphoric Acid in Soils. Fixation of 

 Phosphoric .A.cid. Inunctions of Phosphoric Acid. 

 The Kind of Phosphate to Use. 



CHAPTER IX— Potash Fertihzers 90-97 



Potash Salts (Stassfurt). History of. Kinds of. 

 Kainit. Sylvinit. Muriate of Potash. Sulphate of 

 Potash. Double Sulphate of Potash and Magnesia. 

 Potash Manure Salts. Potassium-Magnesium Car- 

 bonate. Potash from Organic Sources. Wood Ashes. 

 Value of Wood Ashes. Tobacco Stems and Stalks. 

 Cotton-Seed Hull Ashes. Carbonate of Potash. Beet 

 Molasses. Amount of Potash in Soils. Forms of 

 Potash. Fixation of Potash. Functions of Potash. 

 Potash Favors Seed Formation. It Effects the Leaves 

 and Maturity. It Neutralizes Plant Acids. It Checks 

 Insect Pests and Plant Diseases. 



CHAPTER X — Miscellaneous F'ertilizer Materials. . . . 98-103 

 Compost. Seaweed. Marl. Peat and Muck. Pul- 

 verizeii Manures. Fresh Fish and P'resh Fish Wastes. 

 Sewage and Sewage Sludge. Coal Ashes. Lime Kiln 

 .\shes. Rice Hull .\shes. Corn Cob Ashes. Brick 



