 An excavation was made in the field to the depth of six feet, and a stream of water was directed against the vertical wall of soil until it was washed away, so that the roots of the plants growing in it were laid bare. The roots thus exposed in a field...  Report of the Commissioner of Agriculture - Página 558por Commissioner of Agriculture - 1869Vista completa - Acerca de este libro
 | Maine. Board of Agriculture, Maine. Department of Agriculture - 1873 - 516 páginas
...water was directed against the vertical wall until it was washed away, so that the roots of the plants growing in it were laid bare. The roots thus exposed...fibers to a depth of about four feet from the surface of the ground. Roots of winter wheat were observed as deep as seven feet in a light sub soil, forty-seven... | |
 | Ohio State Board of Agriculture - 1873 - 750 páginas
...water was directed against the vertical wall until it was washed away, so that the roots of the plants growing in It were laid bare. The roots thus exposed...fibers to a depth of about four feet from the surface of the ground. Hoots of winter wheat were observed as deep as seven feet in a light subsoil, forty... | |
 | Samuel William Johnson - 1868 - 408 páginas
...directed against the vertical wall of soil until it was washed away, so that the roots of the plants growing in it were laid bare. The roots thus exposed...a mat or felt of white fibers, to a depth of about 4 feet from the surface of the ground. The roots of winter wheat he observed as deep as 7 feet, in... | |
 | Samuel William Johnson - 1868 - 408 páginas
...directed against the vertical wall of soil until it was washed away, so that the roots of the plants growing in it were laid bare. The roots thus exposed...rye, in one. of beans, and in a bed of garden peas, ] (resented the appearance of a mat or felt of white fibers, to a depth of about 4 feet from the surface... | |
 | United States. Department of Agriculture - 1869 - 724 páginas
...directed against the vertical wall of soil until it was washed away, so that the roots of the plants growing in it were laid bare. The roots thus exposed...of winter wheat he observed as deep as seven feet, i» a light subsoil, fortyseven days after sowing. The depth of the roots of winter wheat, winter rye,... | |
 | Washington Government Pritning Office - 1869 - 722 páginas
...directed against the vertical wall of soil until it was washed away, so that the roots of the plants growing in it were laid bare. The roots thus exposed...appearance of a mat or felt of white fibers to a depth of abont four feet from the surface. The roots of winter wheat ho observed as deep as seven feet, in a... | |
 | Vermont - 1872 - 746 páginas
...water was directed against the vertical wall until it was washed away, so that the roots of the plants growing in it were laid bare. The roots thus exposed...to a depth of about four feet • from the surface of the ground. Roots of winter wheat were observed as deep as seven feet in a light subsoil, fortyseven... | |
 | Michigan. State Board of Agriculture - 1872 - 366 páginas
...water was directed against the vertical wall until it was washed away, so that the roots of the plants growing in it were laid bare. The roots thus exposed...presented the appearance of a mat or felt of white fibres to a depth of about four feet from the surface of the ground. Roots of winter wheat were observed... | |
 | Robert Brown - 1874 - 644 páginas
...difficult to extricate them entire from the earth. Schubart found the roots of winter wheat penetrated as deep as seven feet in a light subsoil forty-seven days after sowing, and that the quantity of roots in proportion to the entire plant decreases from forty per cent on the... | |
 | John Wrightson - 1877 - 234 páginas
...directed against the vertical wall of soil until it was washed away, so that the roots of the plants growing in it were laid bare. The roots thus exposed...presented the appearance of a mat or felt of white fibres, to a depth of about 4 feet from the surface of the ground." The same investigator traced the... | |
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