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Foliar Nutrition
Reasons for deficiency
Plant Nutrients
Requirements & signs of deficiencies
Symptoms of nutrient deficiencies
Trace element deficiency table
Influence of the least nutrient
The influence of pH
The effect of pH
Absorbition of nutrients IONS
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The influence of pH

Put simply, pH is a measure of the acidity or alkalinity on a scale of 1 to 14. A reading of 7 is deemed to be neutral, alkaline if above and acidic if below. The following diagram gives an idea of pH values for a range of commonly found liquids.

 

pH values for commonly used liquids.
  pH  
battery acid <1
vinegar <3 acidic
orange juice >4
boric acid 5
milk <7
pure water 7 neutral
blood >7
sea water 8
borax >9
ammonia >11 alkaline
bleach >12
lye <14

The pH value of soil, as a general rule, ranges from about 4,0 to about 8,5. An azalea, for instance, enjoys a pH of between 4,5 and 5,5 . At pH 4,5 or less, there is damage to root membranes and less favourable conditions for growth of beneficial bacteria.

Optimum pH values for some other plants:

  • Camelias 5,5 to 6,5
  • Gardenias ±6,0
  • Magnolias 6,5 to 7,0
  • Hydrangeas 4,5 to 6,0 ( the lower value gives a blue colour, the higher value gives a pink colour.)

phgraph



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