TABLE OF CONTENTS 



CHAPTER VI 



SOIL WATER 59 



Water Requirements of Plants Soil Components Soil 

 Water. 



CHAPTER VII 



AIR IN SOILS 63 



Composition of the Atmosphere Soil Air Effect of Car- 

 bon Dioxide on Decay Oxygen Must be Present Factors 

 Affecting Soil Air Means of Producing a Change of Soil Air. 



CHAPTER VIII 



THE ASSIMILATION OF PLANT FOOD 70 



Sources of Plant Food Osmosis Function of the Leaves 

 of Plants Leaching. 



CHAPTER IX 



THE FORMATION, COMPOSITION, AND FERTILITY OF SOILS 76 



Formation of Soil Composition of Soils Gain and Loss 

 of Plant Food Importance of the Rotation of Crops 

 Proper Sequence of Crops Use of Manures Keeping the 

 Land Covered. 



CHAPTER X 



ANIMAL MANURES 92 



Quality Liquid Manures Rotted Manures Effect of 

 Exposure to the Weather Rate of Application. 



CHAPTER XI 



AGRICULTURAL LIME 97 



Sources of Lime Effects of Lime on the Soil Shipping 

 Lime Applying Lime to the Soil Machine for Applying 

 Lime Gypsum. 



CHAPTER XII 



PHOSPHORUS 107 



Presence in the Soil Commercial Sources Phosphate 

 Rock Acid Phosphate or Super Phosphate Thomas Phos- 

 phate or Basic Slag Bone Mineral Phosphate Guano 

 Purchase and Application of Phosphorus. 



