. Elementary principles of agriculture : a text book for the common schools . Fig. 47. A, root system of pea with tubercles. B, root system of alfalfa with tubercles. After Belzung on the roots of beans, peas, alfalfa, blue bonnets, etc., we notice in the center a rose-colored area. If a bit of this is scraped into a drop of water, it becomes milky because of the hundreds of bacteria. They are so small that the most powerful microscopes are needed to make out their form. (Fig. 48.) It is these httle plants that have the power to take the free nitrogen of the atmosphere and convert it into such
. Elementary principles of agriculture : a text book for the common schools . Fig. 47. A, root system of pea with tubercles. B, root system of alfalfa with tubercles. After Belzung on the roots of beans, peas, alfalfa, blue bonnets, etc., we notice in the center a rose-colored area. If a bit of this is scraped into a drop of water, it becomes milky because of the hundreds of bacteria. They are so small that the most powerful microscopes are needed to make out their form. (Fig. 48.) It is these httle plants that have the power to take the free nitrogen of the atmosphere and convert it into such form that the nodule-bearing plants, such as the cow-pea, may use it. Without these bacteria the legumes do not fix free nitrogen. It is this nitrogen-fixing power that makes these plants so valu- 'fubercie o/°\e- , . gume showing able to us. the bacteria.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectagriculture, bookyear
