Test Results:
This explains a lot. I noticed my Psychotria Viridis reacted poorly when my mix was too rich in worm castings. Also, using store bought compost in my potting mix wasn't sufficient feeding even for a short while. I had always heard that compost was very rich in nutrients but perhaps this doesn't apply to all compost.
I stopped making my own aerobic compost once I got the worm farm and started buying a local brand of pre-packaged compost. I used both compost and castings in my soil mix and determined the best ratios by experimentation. It was very puzzling until I tested.
Results for Ph, Nitrogen(N)and Phosphorous(P) are all color match. Potassium(K) is determined by cloudiness:photo 1. Results from store bought local brand of compost
Ph around 7 is ok but NPK is low
photo 2. Standby for hyperspace core transfer.
The worm castings are hitting all high marks.
The cloudy ph tube doesn't show up well in the photo but it is about 6.5.
N&P there is no mistaking-- supercharged
K super cloudy -- supercharged.