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Updated: June 6, 2025
According to M. Cuzent, the whole number of plants on an atoll such as Fakarava will scarce exceed, even if it reaches to, one score. Not a blade of grass appears; not a grain of humus, save when a sack or two has been imported to make the semblance of a garden; such gardens as bloom in cities on the window-sill.
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?
Mangrove, that horror of the African voyager, shines by its absence; and the soil is not mud, but humus based on gravels or on ruddy clays, stiff and retentive. The formation, in fact, is everywhere that of Eyo or Yoruba, the goodly region lying west of the lower Niger, and its fertility must result from the abundant water supply of the equatorial belt. The charts are fearful to look upon.
Humus, he said, is one of the very best substances for destroying these toxic excrete although they had some other things which were as good or better than any sore of fertilizing materials.
"Our farmers are still producing crops very largely by drawing on this reserve. Of course most of this great supply of humus is very old.
In agriculture, this must ever be taken into account and in this respect humus is of importance in favouring the growth of vegetables, cabbages, &c.
While your soil contains eight hundred pounds of nitrogen on the steeper slopes and one thousand pounds on the more gently undulating areas, ours contains five thousand pounds in the brown silt loam and eight thousand pounds in the heavier black clay loam. This means that our Illinois prairie soil contains from five to ten times as much humus, or organic matter, as your best upland soil.
What do you understand by humus? as, according to Liebig, humus sometimes means one thing and sometimes another, and he appears to treat it very much as modern chemists treat phlogiston, as something which they don't comprehend, but which they need to explain the phenomena of vegetation. If you are a believer in humus, what is it composed of, and how does it act in forwarding vegetation?
It is a mass of volcanic matter to which the air, the rain, and the passage of a million years have given an all-covering verdure except upon the loftiest peaks, have cut into strangely shaped cliffs, sloping hills, spacious vales, and shadowy glens and dingles, and have poured down the rich detritus and humus to cover the coral beaches and afford sustenance for man and beast.
The ability to grow the clovers and to furnish rich vegetable matter to the soil, which naturally is poor in humus, rests upon lime application first, and then upon any supply of plant food that may continue to be lacking. The Litmus Paper Test. A method of testing soils for acidity, which has been in use for many years, is the simple litmus paper method.
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