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2. Terra preta - Wikipedia

   en.wikipedia.org/wiki/Terra_preta

   Terra preta (Portuguese pronunciation: [ˈtɛʁɐ ˈpɾetɐ], literally "black soil" in Portuguese) is a type of very dark, fertile anthropogenic soil (anthrosol) found in the Amazon Basin. It is also known as "Amazonian dark earth" or "Indian black earth". In Portuguese its full name is terra preta do índio or terra preta de índio ("black ...

3. List of Superfund sites in Washington (state) - Wikipedia

   en.wikipedia.org/wiki/List_of_Superfund_sites_in...

   The NPL guides the EPA in "determining which sites warrant further investigation" for environmental remediation. [2] As of May 1, 2010, there were 48 Superfund sites on the National Priorities List in Washington. [2] Seventeen others have been cleaned up and removed from the list; no sites are currently proposed for addition.

4. Superphosphate - Wikipedia

   en.wikipedia.org/wiki/Superphosphate

   Superphosphate is a chemical fertiliser first synthesised in the 1840s by reacting bones with sulfuric acid. The process was subsequently improved by reacting phosphate coprolites with sulfuric acid. Subsequently, other phosphate-rich deposits such as phosphorite were discovered and used. Soluble phosphate is an essential nutrient for all ...

5. Topsoil - Wikipedia

   en.wikipedia.org/wiki/Topsoil

   Topsoil is composed of mineral particles and organic matter and usually extends to a depth of 5-10 inches (13–25 cm). Together these make a substrate capable of holding water and air which encourages biological activity. There are generally a high concentration of roots in topsoil since this is where plants obtain most of their vital nutrients.

6. Fertilizer - Wikipedia

   en.wikipedia.org/wiki/Fertilizer

   A farmer spreading manure to improve soil fertility. A fertilizer (American English) or fertiliser (British English) is any material of natural or synthetic origin that is applied to soil or to plant tissues to supply plant nutrients. Fertilizers may be distinct from liming materials or other non-nutrient soil amendments.

7. Phosphate rich organic manure - Wikipedia

   en.wikipedia.org/wiki/Phosphate_rich_organic_manure

   Phosphate rich organic manure is a type of fertilizer used as an alternative to diammonium phosphate and single super phosphate . Phosphorus is required by all plants but is limited in soil, creating a problem in agriculture In many areas phosphorus must be added to soil for the extensive plant growth that is desired for crop production.