SOIL IMPROVERS & COMPOSTS

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WE DELIVER! To Toowoomba & Surrounding Regions

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GYPSUM

Gypsum is a fine crystalline mineral (crushed rock) that greatly improves the structure of clay soil by causing the clay particles to coagulate. This thereby facilitates drainage and movement of air through the soil. Gypsum has little effect on soil pH however it may make an alkaline soil slightly more acidic. Apply to the surface of the soil (or gently fork into the soil) approximately 1 litre (1 kg) per square metre. It is a particularly effective way to correct calcium deficiency in alkaline soil and helps to neutralize excessive soil sodium and magnesium.

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INFORMATION GUIDE

Knowing your soil is critical! Some soils are better for growing plants than others. The condition of the soil is crucial to plant and other organic life obtaining the maximum benefit from the soil.

TOOWOOMBA SOIL

The majority of Toowoomba is located on a deep, acid to neutral (6.0 to 7.0 pH) structured red to red/brown clay. Many garden plants do not have a high tolerance to clay soils. The particles of clay are so fine that the roots of plants cannot penetrate the spaces between them. There is little aeration in the soil and thus little oxygen for plant roots and soil-dwelling animals such as earthworms. Fewer animals mean less soil turnover and poorer oxygenation that exacerbates the problem.

Although clay soils tend to be high in nutrients, plants can’t always access these nutrients. At different pH levels, the elements in your soil will form different chemical compounds. Some of these compounds will dissolve in water (soluble). Nutrients must dissolve in water to be accessible to plants. Therefore the pH of the soil must be adjusted for certain compounds to become soluble. The most essential nutrients form soluble compounds when the pH is around 6.5 to 7.0 and therefore this is the most desirable level of pH for most plant life.

It is possible to treat soils (even Toowoomba clay soils) and improve the soil quality thus freeing up nutrients for plants, by adding soil improvers and/or composts regularly to the soil.