If clay soil is obtainable nearby, a small area of sandy soil, such as is required for the garden, can be made into excellent soil by the addition of the former, applied as you would manure. Plow the garden in the fall and spread the clay soil on evenly, harrowing in with a disc in the spring. The result will be as beneficial as that of an equal dressing of good manure—and will be permanent.
It is one of the valuable qualities of lime, and also of gypsum to even a greater extent, that while it helps a clay soil, it is equally valuable for a sandy one. The same is true of ashes and of the organic manures—especially of green manuring. Fertilizers, on sandy soils, where they will not long be retained, should be applied only immediately before planting, or as top and side dressing during growth.
Sandy soil in the garden will produce early and quick results, and is especially adapted to melons, cucumbers, beans and a number of the other garden vegetables.
GRAVELLY SOIL is generally less desirable than either of the others; it has the bad qualities of sandy soil and not the good ones of clay, besides being poorer in plant food. (Calcareous, or limestone pebble, soils are an exception, but they are not widely encountered.) They are not suited for garden work, as tillage harms rather than helps them.
THE IDEAL GARDEN SOIL is what is known as a "rich, sandy loam," at least eight inches deep; if it is eighteen it will be better. It contains the proper proportions of both sand and clay, and further has been put into the best of mechanical condition by good tilth.
That last word brings us to a new and very important matter. "In good tilth" is a condition of the soil difficult to describe, but a state that the gardener comes soon to recognize. Ground, continually and properly cultivated, comes soon to a degree of fineness and lightness at once recognizable. Rain is immediately absorbed by it, and does not stand upon the surface; it does not readily clog or pack down; it is crumbly and easily worked; and until your garden is brought to this condition you cannot attain the greatest success from your efforts. I emphasized "properly cultivated." That means that the soil must be kept well supplied with humus, or decomposed vegetable matter, either by the application of sufficient quantities of organic manures, or by green manuring, or by "resting under grass," which produces a similar result from the amount of roots and stubble with which the soil is filled when the sod is broken up. Only by this supply of humus can the garden be kept in that light, friable, spongy condition which is absolutely essential to luxuriant vegetable growth.
PREPARING THE SOIL
Unless your garden be a very small one indeed, it will pay to have it plowed rather than dug up by hand. If necessary, arrange the surrounding fence as suggested in the accompanying diagram, to make possible the use of a horse for plowing and harrowing. (As suggested in the chapter on Implements), if there is not room for a team, the one- horse plow, spring-tooth and spike-tooth cultivators, can do the work in very small spaces.
If however the breaking up of the garden must be done by hand, have it done deeply—down to the sub-soil, or as deep as the spading-fork will go. And have it done thoroughly, every spadeful turned completely and every inch dug. It is hard work, but it must not be slighted.