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The Soil Is Compact:
Furthermore, the soil is compact, because no dust was seen to rise when the Surveyor crafts landed, nor did the soil crawl electrostatically up the legs of the crafts. The Surveyors also found that the surface is strong enough to support the much heavier Lunar Excursion Vehicle, in which astronauts will land on the surface of the moon.Spiked rollers are used to puncture sod that has become too compact and special aerifying machines are made for use on very large lawns. An excellent Hand Tool is a hollow-tined fork which removes slender plugs of soil when it is pressed into the sod. Failing one of these, you can use an ordinary digging fork by stabbing it into the turf and working it back and forth to loosen the soil somewhat and leave definite slender holes extending to a depth of four inches or so. The holes should be spaced about four inches apart. After aerifying scatter sand or very sandy soil over the surface and brush gently until all the holes are filled.
The role of soil bacteria is crucial for they not only fix nitrogen from the air in a form that plants can use but also promote the processes of decay. Animals whose homes are in the soil have an important if largely mechanical function in shifting and aerating the soil -it has been estimated that earthworms alone can turn over between one and ten tonnes of soil per hectare per year. As they eat and excrete the soil they also change its texture and composition.
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