It's All About the Soil
***Below is a link of an article dating from the Los Angeles Times on October 19, 2011 about the San Fernando's Soil.
http://articles.latimes.com/print/2011/oct/19/local/la-me-dirty-work-20111019
***This is a MUST READ!!! It goes full detail in San Fernando's three main groups of soil-forming materials (residual soils, coastal-plain and old valley-filling soils, and recent-alluvial soils). Each has different types of soils.
1. First group, residual soils, represented by four series-Holland, Atlamont, Sites, and Diablo, which include a total of seven types.
2. The second group, coastal plains and old valley-filling soils, has one series-the Ramona, which has four types
3. The third type, recent-alluvial soils, has four series- Hanford, Tujunga, Yolo, and Dublin, which has twenty-two types.
... And they say the third type is "by far the most important".
Additionally they mention there are three miscellaneous classes of materials- Rough broken land, Rough stony land, and Riverwash, which are mainly nonagricultural.
Also along with the fruits used to plant. It talks about the agriculture, climate, topography and more!
http://soils.usda.gov/survey/online_surveys/california/SanFernandoValley1917/SanFernVallCA1917.pdf
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