Contents. 



CHAPTER PAGE 



I. Introduction 7 



II. Essentials of Plant Life 9 



III. The Plant and the Atmosphere 35 



IV. -Origin of Soils 53 



V. Physical Composition and Classes of Soils 79 



VI. Physical Properties of Soils 101 



VII. The Soil and Water 119 



VIII. Chemical Constituents of the Soil 149 



IX. Chemical Composition of the Soil 167 



X. Active Plant Food and Water Soluble Constituents of the Soil 180 



XI. Chemical Changes in the Soil 204 



XII. Soil Deficiencies 244 



XIII. Losses and Gains by the Soil 271 



XI V. Manure 280 



XV. Sources and Composition of Fertilizers 293 



XVI. Purchase and Use of Fertilizers 312 



XVII. Constituents of Plants 346 



XVIII. Composition of Plants 379 



XIX. Digestion 392 



XX. -Utilization of Food 411 



XXL The Maintenance and Fattening Rations 435 



XXII. Feeding Work Animals and Growing Animals 453 



XXIII. Feeding Milk Cows 461 



XXIV. Calculation of Rations 474 



Index 482 



