John Bonnycastle, James Ryan's An introduction to mensuration and practical geometry PDF

By John Bonnycastle, James Ryan

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3) They are normally free-draining but a few drains may be required where there is clay or other impervious layer underneath. (4) They have a high proportion of sand and other coarse particles but very little clay— usually less than 5%—(they feel gritty). (5) They warm up early in spring but crops are very liable to "burn-up" in a dry period because the water-holding capacity is low. Management. Sandy soils are naturally very low in plant nutrients and fertilizers are easily washed out, so adequate amounts of fertilizer must be applied to every crop.

Drainage (see also "Water in the soil") Normally, the soil can only hold some of the rainwater which falls on it. The remainder either runs off or is evaporated from the surface or soaks through the soil to the subsoil. If surplus water is prevented from moving through the soil and subsoil it soon fills up all the pore-spaces and this will kill or stunt the crops growing there. The water-table is the level in the soil or subsoil below which all the pore space is filled with water. This is not easy to see or measure in clay soils but can be seen in open textured soils (see Fig.

TYPES OF SOIL There are wide variations in the types of soil found on farms. They may be classified in various ways but here they are grouped according to texture. The amount of clay, silt and sand which they contain can be found by a mechanical analysis. This is an elaborate separation of the particles by settling from a water suspension and sieving in the laboratory which can give accurate measurements of the amount of sand, silt and clay particles present. Gravel and stones are not included in a sample for mechanical analysis.

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An introduction to mensuration and practical geometry by John Bonnycastle, James Ryan


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