How soils are warmed 58
How soils lose heat
How to check loss of heat 59
Conditions which influence soil temperature 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