Fertilized (and watered) the potted potatoes to see if helps with yellow

The east-most pot, which has the most yellow received 2 Tbsp kelp meal and 2 Tbsp MRP, no alfalfa.

The middle pot received that, plus 1/4 cup alfalfa.

The west-most pot, which has no yellow yet and is the big terra-cotta-colour pot, received the 2 Tbsp kelp + 2 Tbsp MRP, no alfalfa.

And all received a good watering.