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2. List of agricultural machinery - Wikipedia

   en.wikipedia.org/wiki/List_of_agricultural_machinery

   Agricultural equipment is any kind of machinery used on a farm to help with farming. The best-known example of this kind is the tractor. From left to right: John Deere 7800 tractor with Houle slurry trailer, Case IH combine harvester, New Holland FX 25 forage harvester with corn head. Unimog with a flail hedge and verge trimmer implement used ...

3. 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.

4. Soil fertility - Wikipedia

   en.wikipedia.org/wiki/Soil_fertility

   Soil fertility refers to the ability of soil to sustain agricultural plant growth, i.e. to provide plant habitat and result in sustained and consistent yields of high quality. [3] It also refers to the soil's ability to supply plant/crop nutrients in the right quantities and qualities over a sustained period of time.

5. Soil loss tolerance - Wikipedia

   en.wikipedia.org/wiki/Soil_loss_tolerance

   Soil loss tolerance. Soil loss tolerance for a specific soil, also known as the T value, which can be calculated with [1] formula, is the maximum average annual soil loss expressed as tons per acre per year that will permit current production levels to be maintained economically and indefinitely. T values range from 1 to 5 tons per acre per ...

6. Have you tested your garden soil? Here's what you should know

   www.aol.com/tested-garden-soil-heres-know...

   Taking soil samples. Most gardeners need only submit one soil sample for analysis, no matter the size of the garden, bed or planting area. As long as the soil is not different in color, texture or ...

7. Unified Soil Classification System - Wikipedia

   en.wikipedia.org/wiki/Unified_Soil...

   The Unified Soil Classification System (USCS) is a soil classification system used in engineering and geology to describe the texture and grain size of a soil. The classification system can be applied to most unconsolidated materials, and is represented by a two-letter symbol. Each letter is described below (with the exception of Pt): If the ...