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From cultivated fields, In Wheat . 21 1/2 " " Oats . 22.3 " " Rye . 15.2 " " Potatoes . 34.1 " " Beetroot . 39.1 " " Clover . 44 " " Peas . 62 " " Boussingault obtained from his farm at Bechelbronn, in Alsace, in five years, in the shape of potatoes, wheat, clover, turnips, and oats, 8,383 of carbon, and 250.7 nitrogen.
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