amount to use, 200.
effect on sand, 200.
effect on clay, 200.
in soils, 149.
its action on soils, 149, 200.
sets free potash, 149.
sources of, 171, 200.

Lime stone soluble in water, 31.

Loam, 28.

Loamy soils, 28.

London purple, 117.

Loss of soil water, 53, 155.

Lucern, 13.
roots, 13.


Magnesium in plants, 66.

Maintenance of fertility, 150.

Materials composing soils, 26.

Mallow family, 86.