Corn production in many states of the Midwest is limited by nitrogen levels in the soil. Some farmers reduce the need to apply expensive anhydrous ammonia to their fields by rotating corn crops with nitrogen-fixing soybean crops. Using soybeans to add nitrogen to degraded soils is an example of

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Biological augmentation is defined as the addition of natural predators or pollinators, or the introduction of specific microorganisms or plants, to an ecosystem in order to improve its function. In this case, soybeans are being used as a natural source of nitrogen to improve the soil quality for corn production, which is an example of biological augmentation. The other choices do not accurately describe this process. The biomass pyramid refers to the hierarchy of trophic levels in an ecosystem, promoting leaching efficiency is not related to adding nitrogen to soil, bioremediation refers to the process of using organisms to clean up pollutants in the environment, and trophic efficiency refers to the transfer of energy between trophic levels.

Corn Production in Many States of the Midwest Is Limited