CONTENTS. 



PASS 



Introduction 1 



Difference between Barn Manure and Commercial Fertilizers ... 6 



What is Barnyard Manure ? . 8 



Humus 12 



Are Fertilizers but Stimulants ? 13 



Potash 16 



Wood Ashes 23 



Coal Ashes 29 



Cotton-Seed Hulls 29 



The Uses of Potash in Agriculture .30 



What is Nitrogen ? "34 



Where Nitrogen or Ammonia comes from 35 



How to Handle Fish- Waste, and the Best Way to Feed it to the Crops, 40 



Other Sources for Nitrogen 44 



Phosphoric Acid 54 



Bones, and where they come from 57 



Making our own Superphosphate 58 



Reduction of Unground Bone 64 



The Theories of Fertilizing 68 



Testing our Soils 72 



A Faith that is Dangerous ; Buying Cheap Fertilizers ..... 74 



Making our own Fertilizers 77 



The Manufacturers of Fertilizers 78 



Leather-Waste 79 



Some Facts and Suggestions 81 



Fertilizing Ingredients in Raw Materials and Chemicals 84 



Commercial and Agricultural Values of Fertilizers 86 



Where to Obtain our Fertilizing Material at the Lowest Cost ... 86 



Formulas, and how to Compound them 90 



Formulas for Various Crops 91 



How to Compound our own Formulas 94 



Some Formulas as Compounded 96 



Condensation of Special and other Formulas 98 



How to Mix the Ingredients that enter into a Formula 101 



Applying Fertilizers 102 



The System of Manuring with Unleached Wood Ashes 103 



Fertilizers Excellent for Various Crops, and Suggestions .... 105 



Composts 108 



American Analyses of Composition of Fertilizing Materials . . Ill, 112 



Estimates of Cost of Plant-Food in Crops 114 



A Plea for Mercy 115 



