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#4221
Mario Tenuta
Keymaster

    Hello Meaghan.

    Release of protons (H+) to soil from roots will decrease soil pH, especially very close to the root. So when plants take up predominantly NH4+ has a nitrogen source, the volume around roots is acidified.

    When plants predominantly take up NO3-, they release hydroxyl (OH-) to soil. This increase the pH around roots.

    Mario

    Welcome to the Applied Soil Ecology Lab at the University of Manitoba