Organic Gardening

From Down Under

The pH Scale

The pH scale measures whether your soil is acid or alkaline.

It ranges from 1 which is extremely acid to 14 which is extremely alkaline.

The best range for plants is the middle range, 5.5 to 7.5 A pH of 7 is "neutral". This does not mean it is not acid or alkali but a happy balance.

If your plants are healthy and growing well it is a good indication that your pH is fine. (and you need not worry too much about soil pH) I don't.

If, however, you are doing all the right things, feeding and mulching and watering, and your plants are not responding it may be that your pH level needs adjusting.

In soils that are too acid or too alkali, some elements become unavailable to plants; soil bacteria stop working and are unable to break down matter to release the nutrients your plants require for good health, (even though the nutrients are in the soil). Some elements build up to toxic levels.

To correct a too acid soil you add lime.

To correct a too alkali soil you add Flowers of sulphur.

How much you add depends on how acid or alkali your soil is and your soil type (sand, clay, loam)

Soil test kits can be purchased from most produce stores and cost around $17.00. They give detailed instructions on the correction of pH levels and ideal pH ranges for most plants.

NATURAL SOURCES OF TRACE ELEMENTS FOR COMPOSTING

SULPHUR

CABBAGE LEAVES

IRON

STINGING NETTLE, COMPOST, DANDELION, HORSE MANURE, SPINACH

BORON

BEETROOT LEAVES, HORSE MANURE, COMPOST, SEAGRASS, UNTREATED SAWDUST

MANGANESE

CHICK WEED, COMPOST, UNTREATED SAWDUST

COPPER

STINGING NETTLE, YARROW, DANDELION, CHICK WEED, HORSE MANURE, COMPOST, UNTREATED SAWDUST

ZINC

HORSE MANURE, CORN STALKS, COMPOST, UNTREATED SAWDUST

CALCIUM

DANDELION, LUCERNE HAY, COMFREY, HORSE MANURE, COMPOST, SEAGRASS, BLOOD & BONE

MOLYBDENUM

CORNSTALKS, COMPOST, GRASS CLIPPINGS

NITROGEN

BIRD MANURE, BLOOD & BONE, GRASS CLIPPINGS

PHOSPHORUS

COMFREY, SEAGRASS, HORSE MANURE, BLOOD & BONE

POTASSIUM

COMFREY, HORSE MANURE, SEAGRASS

MAGNESIUM

GRASS CLIPPINGS, SEAGRASS

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