denitrifying, 144.
in manures, 174.
in the roots of legumes, 68.
in the soil, 68, 143.
nitrifying, 144.
nitrogen-fixing, 144.

Bare fallow, 100.
when advisable, 100.

Barn manures, 171.
application of, 177.
condition of, 179.
effect of on soil texture, 172.
loss of value of, 173.
meaning of term, 173.

Beet, 6.

Beets, 4.
nitrogen for, 214.

Biological properties of a fertile soil, 143.

Biology, 143.

Blood, dried, 194.
as a fertilizer, 194.
nitrogen in, 194.