Dolomite for Tea, Coffee, and Plantation Crops — Managing Acidic Soils in High-Rainfall Regions

Introduction

Tea, coffee, rubber, arecanut, and many spice and plantation crops are grown in high-rainfall, hilly regions — exactly the conditions that produce strongly acidic, magnesium-depleted soils. Dolomite is a mainstay amendment in these plantations, correcting acidity while replenishing the calcium and magnesium that heavy rain leaches away. This guide covers why plantation soils need dolomite and how to apply dolomite granules in perennial-crop systems.

Why Plantation Soils Turn Acidic and Magnesium-Poor

The plantation belt shares a difficult soil profile:

• Heavy rainfall continuously leaches calcium, magnesium, and potassium out of the topsoil, driving pH down.
• Naturally acidic parent soils (many are lateritic/red soils) start low and stay low.
• Perennial cropping removes nutrients year after year without the reset of annual tillage.
• Acidifying inputs — many nitrogen fertilizers used on tea and coffee push pH lower over time.

The result is chronically acidic soil, often with visible magnesium deficiency (interveinal yellowing on older leaves), that quietly limits yield and quality.

Note on Tea's Acid Preference

Tea is unusual: it *tolerates and even prefers* moderately acidic soil (often around pH 4.5–5.5), so the goal on tea is not to neutralise the soil to near-neutral. Instead, dolomite is used to arrest excessive acidification and correct magnesium deficiency without over-liming. Applied judiciously and to soil-test guidance, dolomite supplies magnesium and calcium and nudges dangerously low pH back to a healthier point within tea's preferred acidic band — it should not be used to push tea soils toward neutral.

Why Dolomite Suits Plantations

Dolomite is well matched to these systems because it does several jobs at once: