Copyright © 2005 Pearson Education, Inc. publishing as Benjamin Cummings Figure 37.9 The role of soil bacteria in the nitrogen nutrition of plants (layer.

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Copyright © 2005 Pearson Education, Inc. publishing as Benjamin Cummings Figure 37.9 The role of soil bacteria in the nitrogen nutrition of plants (layer 1) Atmosphere N2N2 Soil N2N2 Nitrogen-fixing bacteria Organic material (humus) NH 3 (ammonia) NH 4 + (ammonia) H + (from soil) Soil Atmosphere Ammonifying bacteria

Copyright © 2005 Pearson Education, Inc. publishing as Benjamin Cummings Figure 37.9 The role of soil bacteria in the nitrogen nutrition of plants (layer 2) Atmosphere N2N2 Soil N2N2 N2N2 Nitrogen-fixing bacteria Organic material (humus) NH 3 (ammonia) NH 4 + (ammonia) H + (from soil) NO 3 – (nitrate) Nitrifying bacteria Denitrifying bacteria Soil Atmosphere Ammonifying bacteria

Copyright © 2005 Pearson Education, Inc. publishing as Benjamin Cummings Figure 37.9 The role of soil bacteria in the nitrogen nutrition of plants (layer 3) Atmosphere N2N2 Soil N2N2 N2N2 Nitrogen-fixing bacteria Organic material (humus) NH 3 (ammonia) NH 4 + (ammonia) H + (from soil) NO 3 – (nitrate) Nitrifying bacteria Denitrifying bacteria Root NH 4 + Soil Atmosphere Nitrate and nitrogenous organic compounds exported in xylem to shoot system Ammonifying bacteria

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