Sources/Usage: Some content may have restrictions. If excess nitrogen is found in the crop fields, the drainage water can introduce it into streams like these, which will drain into other larger rivers and might end up in the Gulf of Mexico, where excess nitrogen can lead to hypoxic conditions (lack of oxygen). As commonly found in small agricultural streams, Sugar Creek has been straightened, deepened, and had tile drains installed to favor rapid removal of water from agricultural lands. This image shows Sugar Creek in Indiana, as it has been extensively modified for human use. Fields have been leveled andВ modified to efficiently drain off excess water that may fall as precipitation or from irrigation practices. Of course, nitrogen is used in agriculture to grow crops, and on many farms the landscape has been greatly modifiedВ to maximize farming output. About 78% of the air that we breathe is composed of nitrogen gas, and in some areas of the United States, particularly the northeast, certain forms of nitrogen are commonly deposited in acid rain. Nitrogen, in the forms of nitrate, nitrite, or ammonium, is a nutrient needed for plant growth. Nutrients, such as nitrogen and phosphorus, are essential for plant and animal growth and nourishment, but the overabundance of certain nutrients in water can cause a number of adverse health and ecological effects.

Sugar Creek, Indiana, is a creek running through fertilized farmland.

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