Spinach Handbook

Stock Solutions
Two concentrated stock mixtures are prepared and added to RO water to produce concentrated, full strength, stock solutions. Two separate stock solutions are prepared to prevent precipitation of solids from the solution.

Stock A
These chemicals are added to 300 L of RO water.

Stock B
These chemicals are added to 300 L of RO water.

The nutrient solution used to grow the hydroponic spinach was derived from the above listed full strength stock solutions.  Equal volume parts of stock A and B solutions were diluted 200 times with RO water before the mixture was delivered to the plant roots.  Estimated EC and pH of the dilted nutrient solution are 1.2 mS/cm and 5.8, respectively.