x CONTENTS 
experiments — Horse manure -— Cow manure — Sheep 
manure—Poultry manure—Rate of application—Liquid 
manure—The functions of lime—Commercial fertilizers 
—Sources of nitrogen—Sources of phosphoric acid— 
Sources of potash. 
CHAPTER V 
SoIL PREPARATION ~_-~---------- 70 
Ideal conditions—Changing soils—Composting—Manur- 
ing in the field—Green manuring—Manuring in the 
greenhouse—Drying greenhouse soils—Summer mulch- 
ing — Plowing and harrowing — Spading and raking — 
Applying lime—Applying fertilizers. 
CHAPTER VI 
Som STERILIZATION ~----------------------- = ; 85 
The necessity of sterilization—Methods—Steam steri- 
lization—Temperature required—Time required—Boiler 
and pressure—Preparing soil—Devices for sterilizing— 
Boxes—Pans—Perforated pipe—Perforated pegs—Tile 
—Frequency of sterilization—After treatment—Forma- 
lin sterilization—Strength of solution—Application— 
Cost—Hot water sterilization 
CHAPTER VII 
Insect ENEMIES AND THEIR CONTROL ----------~-------_-_- 103 
The insect problem—Preventive measures—The rotation 
of crops—Steam sterilization—Tobacco fumigation— 
Tobacco preparations — Hydrocyanic gas fumigation — 
Miscellaneous insecticides ——The spraying apparatus — 
Nematodes (Heterodera radicicola)—Aphis—White fiy 
(Aleyrodes vaporariorum) — Appearance of infested 
plants—Red spider (Tetranychus telarius, Linn). 
CHAPTER VIII 
DISEASES AND THEIR CONTROL _____----------------------___ 127 
An important factor—Sanitation—Soil selection—Ma- 
nure selection—Infected plants—Influence of light—In- 
fluence of moisture—Influence of temperature—Vigor 
of growth—Crop rotation—Resistant varieties or strains 
—Steam sterilization—Formalin sterilization—Summer 
mulch —Spraying — Bordeaux mixture — Ammoniacal 
copper carbonate—Potassium sulphide or liver of sul- 
phur—Sulphur. 
