Chemical Properties of Soil

Jun 28th, 2015
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1. pH 2. Salinity (EC) 3. Cation exchange capacity (CEC) 4. Organic matter 5. C:N ratio (Carbon to Nitrogen)

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Chemical Properties of Soil1. pH2. Salinity (EC)3. Cation exchange capacity (CEC)4. Organic matter5. C:N ratio (Carbon to Nitrogen)Soil pHA measure of the acidity or alkalinity of a soil.Neutral = 7.0Acidic < 7.0Alkaline > 7.0Logarithmic scale which means that a 1-unit drop in pH is a 10-fold increase in acidity.Soil pH and plant growthAffects availability of plant nutrients (in general, optimal pH is between 5.5-7.5)Low pH soils (<6.0) results in an increase in Al. Aluminum is toxic to plantsAffects availability of toxic metals (in general, more available in acidic soils)Affects the activity of soil microorganisms, thus affecting nutrient cycling and disease riskNutrient AvailabilityIncreasing soil pH:Liming materials (pure calcium carbonate or dolomitic lime) will increase soil pH.1. Lime is a certified organic product2. Slow-release product. Do not add

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