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2. 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.

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4. Subsoil - Wikipedia

   en.wikipedia.org/wiki/Subsoil

   Subsoil is the layer of soil under the topsoil on the surface of the ground. Like topsoil, it is composed of a variable mixture of small particles such as sand, silt and clay, but with a much lower percentage of organic matter and humus. The subsoil is labeled the B Horizon in most soil mapping systems.

5. Irrigation - Wikipedia

   en.wikipedia.org/wiki/Irrigation

   In modern agriculture, drip irrigation is often combined with plastic mulch, further reducing evaporation, and is also the means of delivery of fertilizer. The process is known as fertigation. Deep percolation, where water moves below the root zone, can occur if a drip system is operated for too long or if the delivery rate is too high.

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7. Humus - Wikipedia

   en.wikipedia.org/wiki/Humus

   Soil carbon sequestration is a major property of the soil, also considered as an ecosystem service. [24] Only when it becomes stable and acquires its multi-century permanence, mostly via multiple interactions with the soil matrix , molecular soil humus should be considered to be of significance in removing the atmosphere's current carbon ...