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" ... depth of eight feet. Mr. Mechi, of Tiptree Hall, England, tells us that the reason clover is usually so short-lived, is the fact that the lower roots are either unable to penetrate the subsoil or to find in it the requisite supplies of food. He also... "
Practical Farm Drainage: Why, when and how to Tile Drain - 第 16 頁
Charles Gleason Elliott 著 - 1882 - 92 頁
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Public Documents of Massachusetts, 第 3-4 卷

Massachusetts - 1875 - 692 頁
...find in it the requisite supplies of food. He also states that his neighbor, Mr. Dixon, of Riven Hall, dug a parsnip which measured thirteen feet six inches in length, but, unfortunately, was broken at that depth. The roots of lucerne often penetrate to the depth of more...
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Annual Report of the Secretary of the State Pomological Society of ..., 第 4 卷

State Pomological Society of Michigan - 1875 - 592 頁
...find in it the requisite supplies of food. He also states that his neighbor, Mr. Dixon, of Riven Hall, dug a parsnip which measured thirteen feet six inches in length, but, unfortunately, was broken at that depth. The roots of lucerne often penetrate to the depth of more...
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