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Inherent Factors Affecting Soil pH

Page 1 Guides for Educators soil pH is a measure of soil acidity or alkalinity. It is an important indicator of soil health. It affects crop yields, crop suitability, plant nutrient availability, and soil micro-organism activity which influence key soil processes. soil pH can be managed by measures such as applying the proper amount of nitrogen fertilizer, liming, and cropping practices that improve soil organic matter and overall soil health. Inherent Factors Affecting soil pH Inherent Factors Affecting soil pH such as climate, mineral content and soil texture cannot be changed. Natural soil pH reflects the combined effects of soil -forming Factors (parent material, time, relief or topography, climate, and organisms). The pH of newly formed soils is determined by minerals in the soil s parent material. Temperature and rainfall control leaching intensity and soil mineral weathering.

Nitrogen cycling is inhibited by low pH. The effectiveness and degradation of herbicides and insecticides and solubility of heavy metals depend on pH. Some diseases thrive when soil is alkaline or acidic. Effectiveness and potential arryover of c certain soil-applied herbicides is also impacted by soil pH.

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