How to Read a Soil Test Report

What each parameter tells you

pH

pH determines whether the nutrients already present in the soil are accessible to the plant. Too low (acidic), and aluminium and manganese can reach toxic levels. Too high (alkaline), and iron, zinc and manganese lock out. Correcting pH is a slow process — lime applications need six to twelve months to work through; acidification takes more than one season. Acting early is the only efficient approach.

EC (Electrical Conductivity)

EC reflects dissolved salt concentration. Under irrigation it builds over time; intensive fertilization accelerates it. In greenhouse soils, EC can reach critical levels quickly and quietly. Periodic leaching irrigation and adequate drainage are the prevention; monitoring is the early-warning system.

Organic Matter

Organic matter percentage is the single number that most concisely summarizes soil health. It governs water retention, aeration, nutrient buffering and microbial life. Raising it is a multi-year project — compost and cover crops move the dial, but not in a single season. For soils already below 1.5%, the yield ceiling is real and measurable.

NPK and Micronutrients

Nitrogen, phosphorus and potassium make up the bulk of fertilizer inputs — but the soil test shows reserve, not availability. Micronutrients (Fe, Zn, Mn, B, Cu, Mo) are needed in small amounts, yet the gap between deficiency and toxicity is narrow. A single low reading may be the root cause of several unexplained symptoms.

The report is not a decision — interpretation is

A soil test report is raw data. The decision — what to apply, when, how much, in what form — requires pairing the report with the crop’s actual needs, the irrigation system and the fertilizer sources available. The report alone cannot make that call.