tailieunhanh - USES OF ORGANIC MATTER AND USES OF INORGANIC MATTER

It will be recollected that, in addition to its mineral portions, the soil contains organic matter in varied quantities. It may be fertile with but one and a half per cent. of organic matter, and some peaty soils contain more than fifty per cent. or more than one half of the whole. The precise amount necessary cannot be fixed at any particular sum; perhaps five parts in a hundred would be as good a quantity as could be recommended. The soil obtains its organic matter in two ways. First, by the decay of roots and dead plants, also of. | USES OF ORGANIC MATTER AND USES OF INORGANIC MATTER What proportion of organic matter is required for fertility How does the soil obtain its organic matter How does the growth of clover etc. affect the soil It will be recollected that in addition to its mineral portions the soil contains organic matter in varied quantities. It may be fertile with but one and a half per cent. of organic matter and some peaty soils contain more than fifty per cent. or more than one half of the whole. The precise amount necessary cannot be fixed at any particular sum perhaps five parts in a hundred would be as good a quantity as could be recommended. The soil obtains its organic matter in two ways. First by the decay of roots and dead plants also of leaves which have been brought to it by wind etc. Second by the application of organic manures. When organic matter decays in the soil what becomes of it Is charcoal taken up by plants Are humus and humic acid of great practical importance When a crop of clover is raised it obtains its carbon from the atmosphere and if it be plowed under and allowed to decay a portion of this carbon is deposited in the soil. Carbon constitutes nearly the whole of the dry weight of the clover aside from the constituents of water and when we calculate the immense quantity of hay and roots grown on Pg 78 an acre of soil in a single season we shall find that the amount of carbon thus deposited is immense. If the clover had been removed and the roots only left to decay the amount of carbon deposited would still have been very great. The same is true in all cases where the crop is removed and the roots remain to form the organic or vegetable part of the soil. While undergoing decomposition a portion of this matter escapes in the form of gas and the remainder chiefly assumes the form of carbon or charcoal in which form it will always remain without loss unless driven out by fire. If a bushel of charcoal be mixed with the soil now it will be the same bushel of .

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