January 19, 2011 report from Wallace Laboratories, LLC, El Segundo, C, sent to HGCG President David Baronfeld for a soil sample submitted July 2010.
At the time of the soil sample (July 2010), the results were the soil was low on Nitrogen, high in Phosphorus, and high in Potassium (Potash). This means the plants would be low in production, yet have plenty of green leaves. Alkalinity (pH) was 7.36.
The soil was identified to be a clay loam, that is slow to absorb water (infiltration rate). It had acceptable levels of micronutrients, although it is quite low in Nitrogen (normal for this area).
For vegetable and fruit gardening (non-treed fruits), Wallace recommends preparing your 300sf plot with (use 1/2 of these amounts for a 150sf triangle):
- 2.4 lb box (small box) of Blood Meal
- 4.5 lbs of gypsum
- compost, as needed (start with 4-6 inches, and mix in)
For ongoing conditioning of your plot, continue to apply either blood meal or urea ((46-0-0) or 0.6 lbs).
In warm weather use (choose one):
- coated urea per label instructions, or
- feather meal, 5 lbs
Irrigate deeply but not frequently after planting to lower the chloride to under 150ppm. Limestone is also present, which can cause chlorosis (iron deficiency, or yellowing of entire plant). Chlorosis can also be caused by over-watering, which happens often where your hose is left to run-out.)
To correct an iron deficiency use:
- Grow More’s Organic-Based Iron Chelate 10%;
- Becker Underwood Sprint 138 Fe, or
- Other Fe EDDHA chelated iron
See pages 3 and 4 of the report below for more detailed analysis, and places to buy amendments. I personally use Orange County Farm Supply, at 826 Chapman Ave, East of the CA 57, in Orange, CA. Ask for our 10% discount!
See original: HBCG Soil Test