CONTENTS. 



i/ I INTRODUCTION 7 



II THE ATMOSPHERE 23 



III THE SOIL 35 



IV NATURAL WATERS 08 > 



/ THE PLANT 7<> 



VI FARM MANURE Ill 



VII COMMERCIAL FERTILIZERS 146 



VIII CROPS . : 173 



IX THE ANIMAL BODY 206 



X FEEDING STANDARDS 229 



Xt FOOD REQUIREMENTS OF ANIMALS 248 



XII MILK AND ITS PRODUCTS 80f> 



XIII INSECTICIDES AND RELATED SUBSTANCES 294 



APPENDIX 315 



INDEX . . 327 



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