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Yes; the most important are: phosphates, nitrates and potassium As chloride. Micronutrients are: calcium, sulfur, iron, magnesium, selenium, sodium etc.
Most types of urine contain nitrates and phosphates and can be use to feed plants and improve soil in a dilute form as the concentration of the urine is so high in the afor mentioned chemicals that it can be deadly to plants. But be careful as urine is acidic and may kill alkaline loving plants in the soil were the urine is used.
The are calcium and sodium phosphates.
Most phosphates are soluble. There are some such as AlPO4 which are not.
Nitrates are ionic compounds soluble in water.
Plant food contains the 3 most needed substances in fertilizer: nitrogen usually supplied by nitrates, phosphorous usually supplied by phosphates, and potassium usually supplied by salts. Other trace compounds are also present.
the country that has the most nitrates in the air is the U.S
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Bacteria is the the most responsible organism that converts nitrogen into nitrates. Which plants can then use.
Yes, most nitrates are soluble
Most nitrogen in the Chesapeake Bay is the result of fertilizer use and agricultural runoff.
Most were Jerichoholics;)