XI 1 CONTENTS 



Chapter Page 



VI. Loss OF SOIL WATER 



By surface wash 



By percolation and leaching 



By evaporation 



By transpiration 



How to check these losses . . -53 



VII. SOIL TEMPERATURE 57 



How soils are warmed 58 



How soils lose heat 



How to check loss of heat . . . -59 

 Conditions which influence soil tempera- 

 ture 60 



Value of organic matter . . . .61 



VIII. PLANT FOOD IN THE SOIL . . . . .63 



IX. SEEDS 70 



Conditions necessary for sprouting . . 70 



Seed testing 75 



How the seeds come up . . -77 



Use of cotyledons and endosperm . . 79 



X. SEED PLANTING 81 



Depth of planting : 



Operation of planting 



Planting machines . . . .81 



Seed classification 85 



Transplanting 87 



XI. SPADING AND PLOWING 90 



Spading the soil 90 



Plowing 91 



Why we spade and plow . . . .91 



Parts of a plow 92 



Characteristics of a good plow . . -95 



The furrow slice 96 



How deep to plow 96 



" Breaking out the middles " . . -97 



