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Untouched by human hands, on the prairies and in the forests, topsoil is deepened year by year as winter frosts break up soft rocks, as dead grasses, leaves, twigs break down into humus, to become part of the topsoil and provide the nourishment for a new round of vegetation. Topsoil is renewable, replaceable. Lost through cropping and erosion, it may be rebuilt and deepened by natural processes.
There are quite a lot of broken magnesia bottles and old shinbones scattered through it, and they ought to help along. The topsoil and the humus may be a little mixed, but we are not going to sort them out by hand. Our method is to go out at twilight the first Sunday in April, about the time the cutworms go to roost, and take a sharp-pointed stick.
In temperate climates with normal rain and snowfall, the topsoil of grasslands or a forest may be deepened year by year and century by century. Topsoil may also be deepened by dust storms that pick up particles of humus from dry lands and carry them to moister areas.
He judged that he was the source of his misery and with application he would find a way to plant himself in their fecund topsoil and burgeon into the future. His childhood memories were mostly American in origin although it was difficult to isolate the Korean episodes from that of the latter.
When the Tide died, it disintegrated into its component molecules; and the result was that all those vast fertile Jungle lands were now beautifully levelled and completely cleared areas covered with up to twenty feet of the richest topsoil imaginable.
You'll have to have farmers to feed the people. And I can farm anything from chemicals to naturals, in hard rock or muddy water." He paused and clamped his jaws together and said proudly, "My father was a farmer, and his father before him. One of the first to put a plow into Venusian topsoil!" "Yes uh of course, Mr. Logan," mumbled Roger. "I don't think there'll er be any trouble about it."
As soon as they hear the voice of Shaw all the vegetables dig themselves in. This saves going all along the rows with a shingle to pat down the topsoil or the humus or the magnesia bottles or whatever else is uppermost. Fred says that certain vegetables kohl-rabi and colanders, we think extract nitrogen from the air and give it back to the soil. It may be so, but what has that to do with us?
I saw the harnessing of the turbulent Missouri, muddy with the topsoil of many states. And I saw barges on new channels carrying produce and freight athwart the nation. Let me give you two simple illustrations of why government projects of this type have a national importance for the whole country.
Vegetation, in its turn, furnishes the nourishment on which animals thrive. At the top of our priority list for the well-being of the earth stands the injunction: conserve and build topsoil. Topsoil is lost through erosion wind erosion, water erosion, erosion through over cropping. It is held in place by stones, grasses, and the roots of shrubs and trees.
The earth with its oceans and its atmosphere is a storehouse containing many if not most of the essentials for survival, growth and development, for mankind as well as a multitude of other life forms. Perhaps its most valuable single asset from the human viewpoint is its topsoil. Topsoil plus light, air and moisture provide the elements necessary for producing vegetation.
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