 He separated them from the soil by the following expedient. 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...  Annual Report of the Secretary of the Maine Board of Agriculture - Էջ 192Maine. Board of Agriculture, Maine. Department of Agriculture - 1873Ամբողջությամբ դիտվող - Այս գրքի մասին
 | Colorado. State Board of Horticulture - 1890 - 634 էջ
...have penetrated the soil. A few experiments by Schubartand others — Schubart separated the roots from the soil by the following expedient: An excavation...directed against the vertical wall, until it was washed so that the roots of the plants growing in it were laid bare. The roots thus exposed in a field of... | |
 | Frederick Leroy Sargent - 1899 - 140 էջ
...way is that described in the following account of observations carried on by a German botanist : " An excavation was made in the field to the depth of...stream of water was directed against the vertical wall of soil until it was washed away, so that the roots of the plant growing in it were laid bare. The... | |
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