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Fertilizer FAQ's

Why fertilize my garden?

In the same way that all animals need food all plants require certain nutrients. The different elements are categorised into three groups (primary, secondary, and micro–nutrients) according to the quantity required by plants. The three most important nutrients for plants are nitrogen, phosphorous, and potassium – the so-called “primary elements”. In general, nitrogen stimulates green and leafy growth, phosphorus stimulates root and fruit growth, and potassium enhances robustness against cold and disease.

Sulphur is generally regarded as the 4th most important element in plant nutrition. For this reason it is classified as a “secondary element” along with calcium, and magnesium. Plants use sulphur to manufacture protein. Without protein, plants have a yellow complexion and weak leaves and stems.1

As their name suggests, “micro–nutrients” are needed in lower quantities, for this reason they are usually supplied by the soil itself and are not required to supplement your garden.

What is the difference between granular and liquid fertilizer?

Granular fertilizer is made up of dry granules and is packaged in bags. Liquid fertilizer is ‘fertilizer in solution’ and is bottled. They contain the same components, and there is little variation in plant reaction to the two types.

What are the advantages of using a liquid fertilizer instead of a granular fertilizer?

For homeowners, the advantages of liquid fertilizer over granular fertilizer are numerous. Firstly, liquid fertilizer is easier and quicker to apply. This is particularly the case with Fertigation systems which allow gardeners to fertilize when irrigating. These systems dose appropriate quantities of fertilizer into irrigation water.

Secondly, when opened, granular fertilizer products absorb moisture over time making the granules difficult to apply. Granular fertilizers have to be stored in a dry, shady place to increase their useful life. Sulfert 8 is a stable formulation and it can be stored for long periods – there is no need to use it in the current fertilizer season.

Thirdly, liquid fertilizers penetrate the soil much faster than granular fertilizers. This means that there is less risk of the fertilizer’s nitrogen converting into gaseous nitrogen and escaping to the atmosphere (volatilisation). It also means that, there is no risk of children or pets ingesting granules on the soil/lawn’s surface. From an aesthetical perspective, there is no dust and dirt to contend with during and after application when using a liquid fertilizer. Unlike many granular fertilizer products, Sulfert 8 ensures that your garden is always pleasing to the eye.

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What are the disadvantages of using liquid fertilizers?

The major disadvantage of liquid fertilizer is the price associated with the application. There are many ways of applying liquid fertilizers, however, the most convenient way of doing so is through a fertigation system. Unfortunately, these dosing devices are usually expensive. More affordable application can be achieved by using: a spray device, a venturi mix nozzle, or by simply using a watering can.

How do I apply liquid Fertilizer?

A liquid fertilizer can be applied through use of a watering can, a fertigation system, a spray device, or a venturi mix nozzle. Sulfert 8 is highly soluble and will not clog up the proportioning device if used according to instruction.

What does Sulfert 8 offer my garden?

Sulfert 8 is primarily a nitrogen and sulphur source for your plants. Together, the nitrogen and sulphur will stimulate growth and encourage greening. For green and healthy-looking plants use Sulfert 8 as instructed on label directions.

How do I identify a nitrogen deficiency in my plants?

Lack of nitrogen in the soil may be evident if plants appear to have:

  • Yellowish leaves – predominantly on older leaves
  • Stunted growth
  • Premature ripening of fruit1

Sulfert 8 provides nitrogen in the ammonium form for your plants!

How often do I apply Sulfert 8 fertilizer?

Early Spring
When rapid growth begins      (South Africa: Late August – September)
Late Spring
Prior to summer heat and drought stress (South Africa: November)
Early Autumn
After summer heat and drought stress (South Africa: Late March)

Can Sulfert 8 harm my children or pets?

No, Sulfert 8 will not harm your children or pets if applied according to label directions. Unlike granular fertilizers which lie on the surface of the soil, Sulfert 8 is absorbed quickly into the ground for efficient plant uptake. This mitigates the risk of children or pets ingesting Sulfert 8 after application. Many fertilizers contain toxic herbicides or pesticides that are harmful to children and pets – however, Sulfert 8 does not contain such herbicides or pesticides. As customary with all fertilizers, it is recommended that the gardener irrigate thoroughly after application

1The Fertilizer Society of South Africa, Fertilizer Handbook 2003 , 5th revised edition.

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