La culture du sol et des méthodes agricoles modernes . édition qui ne peuvent pas être attainedwhere la charrue ordinaire est utilisé. Il ne faut pas oublier, cependant, que de labourer profond avec la sod charrue ordinaire tournant la sod, comme isnecessarily le cas, pour le fond du sillon et la mise sur les matières premières, le sol non ventilé de surfacela portée dépourvues d'humus, est désastreuse. Malheureusement, il existe des conditions du sous-sol où un labour profond ne peut pas être accom-plished jusqu'à l'état physique du sol a été modifiée. Somesoils sous la profondeur de l'ordinaire sont de charrue si dense et collante, thatpenetration est difficile et impossible à récurer.

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Soil culture and modern farm methods . ition which cannot be attainedwhere the ordinary plow is used. It must be remembered, however, that to plow sod deep with the ordinary plow turning the sod, as isnecessarily the case, to the bottom of the furrow and bringing to thesurface raw, unventilated soil devoid of humus, is disastrous. Subsoil Unfortunately, conditions exist where deep plowing cannot be accom-plished until the physical condition of the soil has been changed. Somesoils below the depth of the ordinary plow are so dense and sticky, thatpenetration is difficult and scouring impossible. In other soils a hard-pan may exist which is not only difficult to penetrate but if turned ormaterially loosened, large air spaces are formed which hinder theupward movement of capillary water. Either condition can be over-come by using the right type of subsoil plow. The benefits of subsoiling are often misunderstood, and, in manyinstances, the farmer has been misled to the extent of making his landunproductive for a number of years.. New Deere Gang Equipped with Subsoil Attachment36 The First Type of Subsoil Plow invented had a narrow share and a long moldboard, which would bringsubsoil to the surface. Theorists at that time believed that subsoil, being new, was rich in plant food elements, and that it would maketheir land productive. The absence, however, of humus in the suteoilresulted in disappointments. If the subsoil was clay or sand, therewould be no production until organic matter was thoroughly mixed withthe soil and reduced to humus. The Next Type of Subsoil Plow devised was one with a duck-bill-shaped point, intended to break up thesoil below the bottom of the furrow. This implement was condemned,

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