. Erweiterte Biologie. Biologie; Physiologie; Reproduktion. 408 VORTEILHAFT AKTIVITÄTEN VON BAKTERIEN Kapitel. Wenn Sie eine POD-Pflanze, wie Klee, Luzerne, Bohne, Erbse, ist Jung, seine Wurzeln sind von der Stickstoff-fixierenden Bakterien angegriffen in der Erde gefunden. Sie die Wurzeln Durchdringen durch die Deli - cate roothairs und selbst in der äußeren Schicht der root. die Zellen. Die Wurzel bietet Ihnen durch den Bau von mehr Zellen in der Region, bilden kleine Knötchen oder tuberkel. In diesen Knötchen, die Stickstoff-fixierenden Bakterien vermehren. Sie nehmen die freien Stickstoff aus der Luft, durchdringt die

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. Advanced biology. Biology; Physiology; Reproduction. 408 BENEFICIAL ACTIVITIES OF BACTERIA chapter. When a pod-bearing plant, such as the clover, alfalfa, bean, or pea, is young, its roots are attacked by the nitrogen-fixing bacteria found in the soil. They penetrate the roots through the deli- cate roothairs and establish them- selves in the outer layer of the root. cells. The root accommodates them by building more cells in that region, forming little nodules or tubercles. In these nodules, the nitrogen-fixing bacteria multiply. They take the free nitrogen from the air which permeates the soil, and build it into nitrites which are later converted to nitrates. ^Vhen the roots of these plants are plowed under, they decay, and the nitrates are liberated into the soil. Soil may be inoculated with cultures of nodule bacteria. A crop of clover or alfalfa plowed under supplies the soil with about 100 They were both watered with a nutrient pOUuds of uitrOgCU tO the acrC. Such solution containing all the necessary ^ Jg ^^ Valuablc aS many loads nutrients but nitrogen. Explain the -t^ ^ relation of the tubercles to the growth ^f manurC. A gOod CrOD of COm Or of the plant. ^ ° ^ wheat will take from 50 to 75 pounds of nitrogen per acre from soil. There are certain free- living soil bacteria which build nitrogen into nitrates when con- ditions are favorable. The result of the activity of these organ- isms is not unlike the nitrates formed by nitrogen-fixing bacteria. But they differ from the nitrogen-fixing bacteria in that they do not need roots of plants for their homes. Lightning and similar electric discharges in the air unite some free nitrogen w^ith oxygen to form nitrates. These are washed from the. The value of nitrogen-fixing bacteria was demonstrated in the above experi- ment. When the roots of the plants were examined, those on the left had numerous well-developed tubercles; those on the right had no tubercles.. Please note that these images are extracted from s

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• bookcentury1900
• bookdecade1920
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• booksubjectphysiology