Elementary principles of agriculture : a text book for the common schools elementaryprinci02ferg Year: 1913 The Plant as Related to the Soil 45 the first effort is to destroy the granular texture, which is done by wetting and working the clay. Puddled clays do not crumble when dried before baking. Neither will a soil puddled by plowing when too wet crumble into fine particles in drying. (See T[ 105 and Fig. 40.) (b) By exposing the soil to the weathering influences of the air, frost, sun, snow, etc. When a lump or clod of stiff soil is left exposed to the alternate wetting of the rain and dr
Elementary principles of agriculture : a text book for the common schools elementaryprinci02ferg Year: 1913 The Plant as Related to the Soil 45 the first effort is to destroy the granular texture, which is done by wetting and working the clay. Puddled clays do not crumble when dried before baking. Neither will a soil puddled by plowing when too wet crumble into fine particles in drying. (See T[ 105 and Fig. 40.) (b) By exposing the soil to the weathering influences of the air, frost, sun, snow, etc. When a lump or clod of stiff soil is left exposed to the alternate wetting of the rain and drying of the sun, it breaks up into many smaller particles and becomes mel- low. Without this weather- ing effect, much of our plow- ing would be worse than useless. The land often breaks up cloddy, but in time it becomes mellow and loose. (Fig. 29.) It requires time. In order that a soil may be in the best condition for seed- ing, plowing should be done long before planting time so that the weathering influences may have ample time to per- form their work thoroughly. Some soils will weather or crumble promptly, while others, Hke clay, require more time. Under this head should be included some of the effects following under- drainage. (See Fig. 41.) The surplus water is thus carried off and air takes its place, and the soil particles crumble. Fig 29. Waiting for time and the rains to mellow down the clods.
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