Chapter XXI: Indirect Manures--Gypsum, Salt, Etc

Gypsum 462
Mode in which gypsum acts 462
Salt 465
Antiquity of the use of salt 465
Nature of its action 465
Salt not a necessary plant-food 466
Can soda replace potash? 466
Salt of universal occurrence 467
Special sources of salt 468
The action of salt 468
Mechanical action on soils 470
Solvent action 470
Best used in small quantities along with manures 472
Affects quality of crop 472
Rate of application 473