. Dry farming in western Canada . Fig. 17.—Rock Weathering. A step in soil formation.—Chamberlain & Salisbury, courtesy Henry Holt & Co. With the coming of life upon earth, first the bacteria perhaps and then higher plants and animal life, new forces of disintegration came into play. The bacteria were able to feed upon the rock materials, building liv- ing tissue from the solid minerals which they dissolved and assimilated. Plants and then animals took part in the process, exerting in part mechanical or physical force, in part chemical force and in part biological force. With the decay
. Dry farming in western Canada . Fig. 17.—Rock Weathering. A step in soil formation.—Chamberlain & Salisbury, courtesy Henry Holt & Co. With the coming of life upon earth, first the bacteria perhaps and then higher plants and animal life, new forces of disintegration came into play. The bacteria were able to feed upon the rock materials, building liv- ing tissue from the solid minerals which they dissolved and assimilated. Plants and then animals took part in the process, exerting in part mechanical or physical force, in part chemical force and in part biological force. With the decay of vegetable and animal matter organic acids were liberated and these assisted in the process.
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectdryfarm, bookyear1921
