Chemical aspects of soil health

 

Soil health relies on three essential pillars: physical, chemical, and biological. These dimensions interact to sustain fertility, resilience, and productivity. This article focuses on the chemical aspects that determine nutrient availability and plant performance.

Soil nutrients

A balanced nutrient profile is crucial for optimal growth. Macronutrients such as nitrogen (N), phosphorus (P), potassium (K), and sulphur (S), together with micronutrients like iron, zinc, manganese, and copper, play vital roles in photosynthesis, protein synthesis, and enzyme activation.
Sulphur is especially important for amino acid formation and nitrogen utilization. Deficiencies can limit yield and compromise crop quality.

Soil pH

Soil pH regulates how nutrients interact and are absorbed by roots. Most crops thrive in a slightly acidic to neutral range (pH 6.0–7.0). Outside this range, nutrient availability decreases, reducing fertilizer efficiency.

Cation Exchange Capacity (CEC)

CEC measures the soil’s ability to retain and release essential nutrients such as calcium, magnesium, and potassium. High-CEC soils act as nutrient reservoirs, minimizing leaching and improving root uptake.

 

Organic matter

Organic matter—such as humus and decomposed plant residues—enriches the soil, enhances nutrient and water retention, and stimulates beneficial microbial activity.

Salinity

Excessive salinity interferes with water absorption and can stress plants. Monitoring salt levels is essential to maintain soil fertility and productivity.

Maintaining chemical balance is essential for sustainable agriculture. AFEPASA’s Sultech range, including Microsul 40S and Organosul 20S, provides highly available sulphur that corrects deficiencies, balances soil pH, and enhances nutrient availability—strengthening soil health and supporting more resilient, productive crops.