Soil nutrients

I found a website with recommendations for fertilization of vineyards. Their recommendation regards growing conditions in various countries, including Italy, Spain, South Africa and India, which I imagine would apply to us as well. 

• Plant population: 2,000-10,000 vines/Ha.
• Soil type: light to medium.
• Expected yield: 15-30 T/Ha.

Soil level		Suggested correction method
Low P	10-25 ppm	Band 1250-600 (resp.) Kg/Ha superphosphate
Medium P	25-40 ppm	Band 600-350 (resp.) Kg/Ha superphosphate
High P	40 ppm and above	Band 350-200 (resp.) Kg/Ha superphosphate
Low K	<200 ppm	360 Kg/Ha SOP
High K	>200 ppm	No correction required

Our soil analysis showed very low concentrations of both Potassium (K) and Phosphorus (P).  The analysis also confirmed the pH readings we got using our gauge. 

That may explain our low yield in year one. As we have now placed seaweed at the base of the first ten plants, I am hopeful that we can correct that over the course of the winter. I'd like to maintain an organic approach to the management of the vines. 

Happy winter solstice!