Farm Development: An Introductory Book in Agriculture, Including a Discussion of Soils, Selecting & Planning Farms, Subduing the Fields, Drainage, Irrigation, Roads, Fences, Together with Introductory Chapters Concerning Farm Business, and the Relations of General Science to AgricultureOrange Judd Company, 1910 - 391 páginas |
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Página 32
... particles which form the larger part of our soil as we see it today . Some of the lower forms of plant life which live largely from the elements of the air , at first grew upon the rocky surfaces and on the pulverized surface ma ...
... particles which form the larger part of our soil as we see it today . Some of the lower forms of plant life which live largely from the elements of the air , at first grew upon the rocky surfaces and on the pulverized surface ma ...
Página 34
... particles to the low places and with them the forms of life that then existed , thus leaving a record of the times in the fossils preserved in the layers thus formed . In some cases a deposit of earlier records has been raised and ...
... particles to the low places and with them the forms of life that then existed , thus leaving a record of the times in the fossils preserved in the layers thus formed . In some cases a deposit of earlier records has been raised and ...
Página 35
... particles from many places , thus mixing them together and spreading them out in layers ready to form the home of plants . In other places the winds bring together soil particles in a mixture which is adapted to the growth of plants ...
... particles from many places , thus mixing them together and spreading them out in layers ready to form the home of plants . In other places the winds bring together soil particles in a mixture which is adapted to the growth of plants ...
Página 39
... particles of sand and clay , depositing the heaviest particles first . The finer particles of clay and silt are often carried long dis- tances before they are deposited in the quiet waters of some lake or large stream . Since the fine ...
... particles of sand and clay , depositing the heaviest particles first . The finer particles of clay and silt are often carried long dis- tances before they are deposited in the quiet waters of some lake or large stream . Since the fine ...
Página 40
... particles of all kinds of rocks , thus making soils wonderfully adapted to the growth of useful plants . These soils of mixed materials furnish ideal mechanical conditions for the roots of plants , contain the needed variety of mineral ...
... particles of all kinds of rocks , thus making soils wonderfully adapted to the growth of useful plants . These soils of mixed materials furnish ideal mechanical conditions for the roots of plants , contain the needed variety of mineral ...
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Farm Development; An Introductory Book in Agriculture, Including a ... W. M. Hays Sin vista previa disponible - 2017 |
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