Monitor Soil pH and Nutrient Levels
Tomatoes and peppers thrive at a soil pH of 6.0–6.8. If pH dips too low (acidic), plants struggle to absorb calcium and magnesium; too high (alkaline) and iron uptake suffers, leading to yellow leaves. A simple home test kit can guide you.
Adjust pH by adding lime to raise acidity or elemental sulfur to lower it. Conduct a soil test every two seasons and top-dress with worm castings or balanced organic fertilizer to replenish nutrients. Consistent fertility means steady flowering and larger fruits!