Germs, 143.
denitrifying, 144, 147.
nitrifying, 144, 145.
nitrogen fixing, 144.

Goosefoot family, 86.

Gourd family, 86.

Grafting, 136.

Grain crops humus wasters, 224.

Grain soils, 28.

Grass, 5.
family, 86.
soils, 28, 29, 30, 162.

Gravel, 26.

Gravelly loams, 29.

Green-crop manures, 171, 183.
benefits from, 185.
best plants for, 185.

Green manure-crops, 186.
clovers as, 188.