Clevis, 93.

Climbing plants, 121.

Clover, 68.
Bokhara, 190.
crimson, 189.
mammoth, 189.
red, 188.

Clovers, as green manure-crops, 188.
as nitrogen gatherers, 184.
nodules on roots of, 184.

Commercial fertilizers, 171, 192.
amount to buy, 212.
home mixing, 211.
kind to buy, 212.
raw materials, 192.
(See also Fertilizers.)

Composts, 171, 181.

Conditions necessary for root growth, 20.

Corn, a humus waster, 226.
depth of root growth of, 13.
flower of, 132.
germination of, 78, 79.