Archive image from page 181 of Dairy farming being the. Dairy farming : being the theory, practice, and methods of dairying dairyfarmingbein00shel Year: 1880 HO DAIRY FARMING. intervals, the niitUllc of those intervals remains unbenetited. ' It appeare to me that the only reasonable argument for the shallower draining of a stiff clay soil arises out of its greater richness in matters which the plant requires as food. There is no doubt that plants will make use of a verj' great depth of soil and subsoil if it be laid open to them; but, on the other hand, it is jilain that a smaller depth of
Archive image from page 181 of Dairy farming being the. Dairy farming : being the theory, practice, and methods of dairying dairyfarmingbein00shel Year: 1880 HO DAIRY FARMING. intervals, the niitUllc of those intervals remains unbenetited. ' It appeare to me that the only reasonable argument for the shallower draining of a stiff clay soil arises out of its greater richness in matters which the plant requires as food. There is no doubt that plants will make use of a verj' great depth of soil and subsoil if it be laid open to them; but, on the other hand, it is jilain that a smaller depth of clay soil, with its larger quantity of internal surface—owing to the sniall- ness of its particles, and its richer comiKisition, too—will contain as much available food for plants as a much greater depth of sandy soil. It thus amounts to this, that the maximum which it is desirable, as a supply of food, to lay open to plants I's smaller in clays than in sands; while the minimum depth—that at which the drains must be laid, if the capillary attraction of the soil for water is to be overcome at all—is greater in clays than in sands. The capillary attraction of the clayey soils is greatest; it is in them that water will be lifted highest from the level of the drains, and it is in them, therefore, that the drains must be laid lowest before any drainage at all is effected by them. 'On the arrangement of the drains upon the land, it would seem plain that, as we have already provided for the exit of spring-water, and as our object now is mei-ely to remove from below the soil the water which falls upon its surface, the channels for that purjiose should be placed as uniformly below as the water to be removed is supplied above. And this, as a general rule, does accordingly guide the practice of the drainer. Nevertheless, the structure of the sub- soil docs to some extent justify a departure from that uniform arrangement of drains which would at first sight seem to be justified by
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