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At a recent avocado meeting, Carol Lovatt of the Botany Department at UC Riverside pointed out that avocado fruit take up more potassium than nitrogen, almost twice as much, and that much of that uptake occurs later when the fruit is expanding.

http://ciwr.ucanr.

Assessing water quality for Southern California agriculture typically revolves around the total salinity of the water, its total dissolved solids (TDS), and the toxic ions boron, sodium and chloride.

Along with drought there are also concerns about water quality which has all kinds of weird units that area actually convertible. Here's a little guide for the principle water quality components and their conversions.

Dothiorella leaf blight which is really a whole range of fungi that cause leaf diseases, along with cankers and wilts goes to many different host plants from citrus to Brazlian pepper to ash to redwood to palm to pittosporum to eucalyptus to pine.