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Baking Soda Test for Acidic Soil

Soil acidity can reduce nutrient availability and affect crop growth. If the soil is too acidic, fertilizers like phosphorus and zinc may not work effectively. While lab testing is ideal, you can do a quick home test using baking soda to check if your soil is acidic.

What You Need

• Moist soil (from 3–6 inches depth)

• 1 tablespoon baking soda

• A clean bowl

• Water (if soil is dry)

How to Do the Test

1. Place moist soil in a clean bowl.

2. Add 1 tablespoon of baking soda.

3. If the soil is dry, add a few drops of water to moisten it.

4. Mix gently and observe.

What to Observe

• Fizzing or bubbling: Soil is acidic (pH likely below 6.5).

• No reaction: Soil is neutral or alkaline.

Why It Matters

Acidic soils lock essential nutrients like zinc and phosphorus. Even if you apply good fertilizers, the crop won’t respond well. Correcting soil pH improves nutrient uptake and crop performance.

Next Step

If fizzing is seen, the soil is acidic. In such cases:

• Apply agricultural lime or dolomite to neutralize pH