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How to Fix Alkaline Soil?

To fix alkaline soil, it’s essential to use amendments in appropriate quantities, typically based on grams or kilograms, to ensure gradual and effective pH reduction without harming the soil. Here’s a guide with recommended dosages for common soil amendments:

1. Organic Matter (Compost, Peat Moss):

Apply 2.5 to 10 cm (1 to 4 inches) of compost or peat moss to the soil, mixing it into the top 15-20 cm (6-8 inches). For a 10 m² (100 square feet) area, use approximately 20-40 kg of compost or peat moss. This helps improve soil structure and mildly acidifies the soil over time.

2. Elemental Sulfur:

For slight pH reduction (about 1 pH point), apply 45 to 90 grams per square meter (about 1 to 2 pounds per 10 m²) of elemental sulfur. For strong alkaline soils (pH above 8), up to 225 grams per square meter (5 pounds per 10 m²) might be necessary. Sulfur works slowly, so it’s important to monitor pH over time.

3. Aluminum Sulfate:

Apply 150 grams per square meter (approximately 1.5 pounds per 10 m²) of aluminum sulfate to lower the pH by around 1 point. For a more significant reduction, you can increase the dosage to 300 grams per square meter (about 3 pounds per 10 m²). This amendment works faster than elemental sulfur but should be used carefully to avoid aluminum toxicity.

4. Iron Sulfate:

Apply 100 to 200 grams per square meter (1 to 2 pounds per 10 m²) for a moderate pH reduction. This amendment works more quickly than sulfur, especially for plants like blueberries.

5. Acidic Fertilizers (Ammonium Sulfate, Ammonium Nitrate):

For ammonium sulfate, apply 50-100 grams per square meter (0.5 to 1 kg per 10 m²). This also provides nitrogen while acidifying the soil.

6. Vinegar Solution for Watering:

Dilute 15 grams (1 tablespoon) of vinegar in 1 liter of water and apply it directly to the soil. This is effective for small-scale or container plants but should be used cautiously.

Regular soil testing is crucial to track pH changes and prevent over-acidification.


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