TABLE OF CONTENTS XI 



PAGE 



CHAPTER XIII 



NITROGEN 120 



Importance of Nitrogen Commercial Nitrogen Profitable 

 Selection of Source of Nitrogen Inorganic Sources of 

 Nitrogen Saltpeter Sodium Nitrate Calcium Nitrate 

 Ammonium Sulphate Organic Sources of Nitrogen Vege- 

 table Sources. 



CHAPTER XIV 



SOURCES AND USE OF POTASH SALTS 137 



Occurrence Wood Ashes Organic Sources of Potash 

 Minor Sources Commercial Salts of Potash Functions of 

 Potash Use of Potash on Different Soils Selection of the 

 Source of Potash Tendency to Use too Much Potash. 



CHAPTER XV 



MEASURING PLANT FOOD REQUIREMENTS 152 



Forms of Plant Food Soil Analyses Field Tests. 



CHAPTER XVI 



MIXING OF FERTILIZERS 162 



Advantages of Home Mixing The Calculation of Formulas. 



CHAPTER XVII 



ANIMAL NUTRITION 174 



Purposes of Animal Food Classes of Foods Development 

 of the Science of Animal Nutrition Digestible Nutrients 

 Metabolism Rations for Various Purposes. 



CHAPTER XVIII 



FEEDS AND THE CALCULATION OF RATIONS 184 



Corn Oats Barley Dried Brewers' Grain Rye 

 Wheat Rice Cottonseed Meal Linseed Meal Meat 

 Scraps Dried Fish Blood Meal Soy-bean Meal Pea- 

 nuts Timothy Cereals Legumes Composition and Diges- 

 tibility of Feeds The Calculation of Rations. 



CHAPTER XIX 



MILK AND ITS PRODUCTS 198 



Milk Danger from Infected Milk Preservatives The 

 Detection of Formaldehyde in Milk Detection of Boracic 

 Acid Testing Milk for Per Cent of Fat Determination of 

 Specific Gravity Ash Butter Cheese Condensed Milk. 



