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Fertilizer
N, P & K (Nitrogen Phosphorus & Potassium)

Nitrogen:
Encourages vegetative growth

‚ Important in making chlorophyll

‚ It is fast acting with a

short soil life

Potassium:
Winter hardiness - in the autumn

‚ Strong stems

‚ Better root system

‚ Has a long residual time in the soil

Shultz Cactus Fertilizer Pursells Sta Green Fertilizer Scotts Osmocote Fertilizer Schultz Blooms PLus Fertilizer
Phosphorus:
Increases flowering and fruiting

‚ Flower colour is more intense

‚ Flowers last longer

‚ Shorter internodes

Micronutrients:
‚ Eliminate micronutrients deficiencies.

‚ Work as a catalyst for the macronutrients (N, P & K)

‚ Holds well in the soil in a form that can be readily available to the plant

pH

pH is the relative acidity or alkalinity of the soil

This scale is logarithmic: a soil with a pH of 4 is 100 times as acidic as one with a pH of 6 and 10 times as acidic as one with a pH of 5.

All plants have a soil pH requirement. This pH is determined by the plants ability to maximize food uptake. If the pH of a soil is too alkaline or too acidic a plant can starve, even in the presence of sufficient food. Also, incorrect pH can result in a build up of nutrients to toxic levels.

Examples of pH requirements

  • Vegetables - 5.0 to 7.0

  • Residential Turf Grass - 6.5 to 7.0

  • Rhododendron, Azalea, Blueberry - 5.0 to 6.0

  • Clematis - approx 7.0

pH Control

To change a soil pH

  • Sandy soils - They are easier to change the pH but the changes last a shorter time.

  • Clay soils - They are harder to change, but the changes last longer

  • Horticultural lime is used to raise the pH.  The finer the horticultural lime, the faster acting it will be.

  • Peat Moss - Pine needles have a pH of about 6.0 to 6.5

  • Finished compost usually has a pH of 6.5

  • Garden sulphur is used to make a soil more acidic and is quick acting.  Use caution

  • Always follow the label directions


             Acidic                 Alkaline   10

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