Good question. I have no idea. I have soil that I think is some of the best in the world. It's mostly composted hay. So I am able to get by with very little fertilizer. I hardly use any at all. But I still love the injector idea to be able to inject tiny amounts at each watering, plus to combat any specific deficiencies that pop up towards the end of the season, typically magnesium. If I'm running the drip, I always want to be pumping a little something through it, even if it is just a little molasses.
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