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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. There are generally a high concentration of roots in topsoil since this is where plants obtain most of their vital nutrients.

3. Structural Soil - Wikipedia

   en.wikipedia.org/wiki/Structural_Soil

   Structural Soil is a medium that can be compacted to pavement design and installation requirements while permitting root growth. It is a mixture of gap-graded gravels (mostly made of crushed stone) and soil (mineral content and organic content). It provides an integrated, root penetrable, high strength pavement system that shifts design away ...

4. Friant-Kern Canal - Wikipedia

   en.wikipedia.org/wiki/Friant-Kern_Canal

   The Central Valley Project Delta-Mendota Canal replenishes the San Joaquin River at the town of Mendota, and replaces the volume of water being delivered by the Friant-Kern Canal. Average annual throughput is 1,051,000 acre-feet (1.296 km 3 ), with a high of 1,720,000 acre-feet (2.12 km 3 ) in 2005, and a low of 58,000 acre-feet (0.072 km 3 ...

5. Irrigation - Wikipedia

   en.wikipedia.org/wiki/Irrigation

   Irrigation (also referred to as watering of plants) is the practice of applying controlled amounts of water to land to help grow crops, landscape plants, and lawns. Irrigation has been a key aspect of agriculture for over 5,000 years and has been developed by many cultures around the world. Irrigation helps to grow crops, maintain landscapes ...

6. Soil fertility - Wikipedia

   en.wikipedia.org/wiki/Soil_fertility

   Soil fertility is a complex process that involves the constant cycling of nutrients between organic and inorganic forms. As plant material and animal wastes are decomposed by micro-organisms, they release inorganic nutrients to the soil solution, a process referred to as mineralization.

7. USDA soil taxonomy - Wikipedia

   en.wikipedia.org/wiki/USDA_soil_taxonomy

   A taxonomy is an arrangement in a systematic manner; the USDA soil taxonomy has six levels of classification. They are, from most general to specific: order, suborder, great group, subgroup, family and series. Soil properties that can be measured quantitatively are used in this classification system – they include: depth, moisture ...