The soil 215
The system of farming 215
Testing the soil 215

XXIV.--ROTATION OF CROPS 219
Systems of cropping 219
The one crop system 221
Rotation of crops 224
Benefits derived from rotation of crops 230
The typical rotation 231
Conditions which modify the rotation 232
General rules 233
Length of rotation 233

XXV.--FARM DRAINAGE 235
How surplus water affects fertility 235
Indications of a need of drainage 235
Drains:
Surface drains
Open ditch drains
Covered drains or under drains 236
Influence of covered drains on fertility 237
Location of drains:
Grade
Tile drains 238

GLOSSARY 241