The pH required for the healthy growth of plants can be determined using a pH meter or pH testing kits. Soil pH is crucial for nutrient availability, and different plants thrive in specific pH ranges. To measure soil pH, a soil sample is collected, and a pH meter or testing kit is used to assess the acidity or alkalinity. Alternatively, pH paper or indicator solution can be employed for a quick estimation. Adjusting soil pH within the appropriate range ensures optimal nutrient uptake for plant growth. Regular monitoring and adjustments help create a conducive environment for healthy plant development.