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The last gadget mentioned here is a little expensive, but it might be helpful for dealing with a problem plant. I don't know if it gives soil PH info, but it does say something about fertilizer.
This huge, analog “farm” built by our predecessors is a snarled cats-cradle of crisscrossed strings between origin and destination, shipment and storage. And with the advent of natural-resource scarcity, flattening yields, loss of biodiversity, changing climates, environmental degradation, and booming urban populations, we’re hurtling toward its natural limit.
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