Green-crop manures:
Functions 183
Benefits 185
Character of best plants for green-crop manuring 185
The time for green-manure crops 186
Leguminous green-manure crops 186
Non-leguminous green-manure plants 191

XXI.--COMMERCIAL FERTILIZERS 192
The raw materials 192
Sources of nitrogen 193
Sources of phosphoric acid 195
Sources of potash 199
Sources of lime 200

XXII.--COMMERCIAL FERTILIZERS, CONTINUED 202
Mixed fertilizers:
What they are
Many brands
Safeguard for the farmer
Low grade materials
Inflating the guarantee 202
Valuation 205
Low grade mixtures 207
Buy on the plant food basis 209

XXIII.--COMMERCIAL FERTILIZERS, CONCLUDED 211
Home mixing of fertilizers 211
Kind and amount to buy 212
The crop 213