endeitz

Great info, Richard. Does the estimate of 1-2 years for micronutrient depletion assume that no natural amendment, such as compost, has been added as top dressing?

I will look into the fertigation systems more closely and then start a thread, so I will be more likely to have relevant questions to ask.

Good thread on pH meters. I actually have that same pH meter that you show with the probe submerged in seaweed extract. It has performed faithfully (good enough for me, at least) for a couple of years now. I got it at Lowe's.

Just for fun, I called the local greenhouse supply this evening. They carry Jack's 20-10-20 water soluble fertilizer:

this one

for 37.99. Not as good an NPK as yours (although the micros look OK to my untrained eye), and about the same price.

Cheers,

Ed.