Rhubarb soil, 28.

Ridging the soil, 98, 158, 169.

Rock salt, 31.

Rollers, 107.

Rolling, 101, 106, 158.
autumn-sown grain, 106.
light soils, 106.
reason for, 106.
spring-sown grain, 106.

Rolling cutter harrows, 102.

Root, 8.
how it takes moisture, 18.
most important part of plant, 7.

Root hairs, 17, 18.

Roots,
absorb water, 9, 11, 17.
absorb plant food, 10, 11.
alfalfa, 13.
and fertilizers, 15.
growth of in length, 16.
conditions necessary for growth of, 8, 20, 141, 220.