insoluble, 195, 196.
reverted, 196.
soluble, 196.
sources of, 171.

Phosphorus in plants, 66, 67.
in soils, 68.

Plank harrow, 102, 105.

Plant, analysis of, 63.
most important part of to plant itself, 7.
most important part of to plant grower, 7.

Plant diseases, 118.

Plant food, 63.
and the farmer, 5.

Plant food, in soil, 63.
in fertilizers, 68, 192, 205.
what it is, 63, 69.

Planting,
corn, 84.
grass seed, 84.
grain seed, 84.
method of, 83.
seeds, 81.
vegetable seeds, 84.