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Answers
If you have an area in your yard that doesn’t seem to respond to your fertilizing efforts, check your soil pH.
Soil pH is the measure of acidity (sourness) or alkalinity (sweetness) of a soil. The pH scale goes from 0.0 to 14.0. The most acid soil is 0.0 and the most alkaline is 14.0. Halfway along the scale, 7.0, is neutral, neither acid nor alkaline. A soil gets more acid as the pH values decrease from 7.0 to 0.0 and is more alkaline as pH values increase from 7.0 to 14.0.
For example lemon juice is 2.4 pH value or acid; water is 7.0 or neutral; soap solution is 9.3 or alkaline.
Soil pH can affect plant growth in several ways. Bacteria that change and release nitrogen from organic matter and some fertilizers operate best in the pH range of 5.5 to 7.0 making this the optimum pH range. Plant nutrients leach from the soil much faster at pH values below 5.5 than from soils within the 5.5 to 7.0 range. In some mineral soils aluminum can be dissolved at pH levels below 5.0 becoming toxic to plant growth. Soil pH may also affect the availability of plant nutrients. Nutrients are most available to plants in the optimum 5.5 to 7.0 range. PH can also affect the structure of the soil, especially in clay soils. In the optimum range clay soils are granular and easy to work with. However, if the soil is either extremely acid or alkaline clay, soils tend to become sticky and hard to cultivate.