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2. Rattan Lal - Wikipedia

   en.wikipedia.org/wiki/Rattan_Lal

   Rattan Lal. University of Sydney, Australia 1968-69; International Institute of Tropical Agriculture, Ibadan, Nigeria, 1969-87; The Ohio State University, Columbus, OH, USA 1987-2010. Rattan Lal (born 5 September 1944) is a soil scientist. His work focuses on regenerative agriculture through which soil can help resolve global issues such as ...

3. Humic substance - Wikipedia

   en.wikipedia.org/wiki/Humic_substance

   Humic substances represent the major part of organic matter in soil, peat, coal, and sediments, and are important components of dissolved natural organic matter (NOM) in lakes (especially dystrophic lakes), rivers, and sea water. Humic substances account for 50 – 90% of cation exchange capacity in soils. "Humic substances" is an umbrella term ...

4. 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 ...

5. Humus - Wikipedia

   en.wikipedia.org/wiki/Humus

   Humus has a characteristic black or dark brown color and is an accumulation of organic carbon. Besides the three major soil horizons of (A) surface/topsoil, (B) subsoil, and (C) substratum, some soils have an organic horizon (O) on the very surface. Hard bedrock (R) is not in a strict sense soil. In classical [1] soil science, humus is the dark ...

6. 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.

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   Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!