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 39
... usually left assorted and in layers , just as the stream on the hillside carries forward gravel and small stones , particles of sand and clay , depositing the heaviest particles first . The finer particles of clay and silt are often ...
... usually left assorted and in layers , just as the stream on the hillside carries forward gravel and small stones , particles of sand and clay , depositing the heaviest particles first . The finer particles of clay and silt are often ...
Página 42
... down from the north many large fragments of the rocks over which it passed , as well as much of the finely pulverized materials . Usually these coarser ma- terials were taken from less than a hundred miles ; 42 FARM DEVELOPMENT.
... down from the north many large fragments of the rocks over which it passed , as well as much of the finely pulverized materials . Usually these coarser ma- terials were taken from less than a hundred miles ; 42 FARM DEVELOPMENT.
Página 51
... usually made up of a framework of more or less finely divided mineral particles , of partially decayed inorganic particles , of water , of air , of small quantities of soluble substances , and of bacteria and other low forms of life ...
... usually made up of a framework of more or less finely divided mineral particles , of partially decayed inorganic particles , of water , of air , of small quantities of soluble substances , and of bacteria and other low forms of life ...
Página 54
... usually much overlapped and mixed . A general soil survey of any locality , outlining the extent of its soil types and mapping each area under an appropriate name , gives a basis for studying the need of each soil area and for ...
... usually much overlapped and mixed . A general soil survey of any locality , outlining the extent of its soil types and mapping each area under an appropriate name , gives a basis for studying the need of each soil area and for ...
Página 58
... usually afford superior conditions for the permanent growth of large crops . It is on these soils that it is possible from generation to generation to increase rather than to decrease the productivity of the land by scientific field ...
... usually afford superior conditions for the permanent growth of large crops . It is on these soils that it is possible from generation to generation to increase rather than to decrease the productivity of the land by scientific field ...
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Farm Development; An Introductory Book in Agriculture, Including a ... W. M. Hays Sin vista previa disponible - 2017 |
Términos y frases comunes
acre agricultural animals better biped bottom brace building canal capillary capillary action capstan carry cement cents clay clover construction corn corner post cost crop rotation crops cubic yard cultivation culverts datum deep depth drain tiles drainage earth engine expense farm home farmers farmstead feet fence fields flood water flow Fresno scraper furrow-slice furrows gate glacial glacier grade grain Grass gravel ground water height Illustrated inches instrument irrigation labor lake Lake Agassiz layer limestone low area macadam material mile Minnesota Minnesota river Mississippi river mixed moisture necessary open ditch outlet particles peat plow practical profitable rain rainfall reversible road machine river road roller roadside roadway rock roots rotation rural sand schools showing shown in Figure side soil spade station stone stream stumps subsoil tile drains tion tivated trees wagon wheat wire fence