Grandmas Garden

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The first thing that pops into my head is soil pH. Beans like slightly acidic soil. If your soil is alkaline, that interferes with iron take up.

Quick test: take a scoop of the soil and pour some vinegar on it. If it bubbles, it's probably to alkaline. (The acid vinegar reacting with the alkaline soil.) You can add a soil acidifier to fix that, like chelated iron.
 
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