Pictures of Rich's students test the Phosphorus and Potassium of the Lettuce leaves

On Wednesday, May 18th students tested the phosphorus and potassium levels of the leaves growing in their farm plot at Battery Park:

The dark blue color indicates that the phosphorus level is high.

The level of precipitate (solid) that forms indicates the potassium level, therefore, we need to compare this to the leaves after we add potassium-rich fertilizer (Plant Tone).