You can dump unlimited nitrogen on a lawn with pH 4.5 and the grass still starves — the nutrients are chemically locked in acidic soil. Most vegetables thrive at pH 6.0-7.0. Test soil pH annually with a $10 kit. Amend with lime to raise pH (takes 3-6 months) or sulfur to lower it. Per most state extension services, pH correction is the single highest-ROI action for any garden.
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