. Adventures with animals and plants. Biology. in ammonia compounds. -N free in air Fig. 328 Find "N in nitrates" on the left and Fig. 329 Roots and base of peanut plant. Ni- trace an atom of nitrogen through one coin- trogen-fixing bacteria live in the nodules. How plete cycle. Which orgajiisms are involved in are legumes such as the pea?iut related to the this cycle? How is free N produced? jiitroge?i cycle? (Brooklyn botanic garden) the soil and kept in plant proteins, in ani- mal proteins, and in the nitrogenous wastes of animals. In all these forms ni- trogen is useless to plant
. Adventures with animals and plants. Biology. in ammonia compounds. -N free in air Fig. 328 Find "N in nitrates" on the left and Fig. 329 Roots and base of peanut plant. Ni- trace an atom of nitrogen through one coin- trogen-fixing bacteria live in the nodules. How plete cycle. Which orgajiisms are involved in are legumes such as the pea?iut related to the this cycle? How is free N produced? jiitroge?i cycle? (Brooklyn botanic garden) the soil and kept in plant proteins, in ani- mal proteins, and in the nitrogenous wastes of animals. In all these forms ni- trogen is useless to plants. The nitrogen, however, is not locked up forever. The ammonium compounds and nitrates needed by green plants are restored to the soil by several groups of bacteria and larger fungi. One group is the decay organisms which form am- monia from the proteins and urea. The sharp odor from a decaying pile of com- post or of manure is that of ammonia. Some of the ammonium compounds are used directly by green plants but large quantities of them are built up by an- other group of bacteria into nitrates. The nitrify ing (ny'tri-fy-ing) bacteria do this. A careful study of Figure 328 will help you understand how nitrogen is kept in circulation. Complications in the nitrogen cycle. Side by side with the nitrifying bacteria which build up nitrates in the soil are other species of bacteria known as deni- trify mg bacteria. Some of the denitrify- ing bacteria again break down some of the nitrates into ammonium compounds and others break down nitrates com- pletely and form nitrogen gas, which then becomes a part of the air. The ele- ment nitrosren cannot be used by ^reen plants in food-making, so nitrogen thus released is temporarily lost to green plants and thus to animals. This loss of nitrogen would be serious were it not for still another group of bacteria. These are the nitroge?i-fixing bacteria of the soil. These bacteria use the gaseous nitro- gen of the air and produce plant proteins,
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