Slow release fertilisers (SRFs) for turf are a special type of fertiliser that releases nutrients gradually over time. This ensures a consistent and predictable nutrient release, which is essential for healthy plant growth. Unlike controlled release fertilisers (CRFs), which use a coating technology to release nutrients, SRFs are made up of minerals that take a certain amount of time to become soluble and available to the turf.
The nutrient release of SRFs is influenced by a variety of factors, including temperature, water, soil pH, and microbial activity. For example, warmer temperatures and higher levels of soil moisture can increase the rate of nutrient release, while cooler temperatures and drier soil conditions can slow it down. Soil pH can also affect the rate of nutrient release, as certain minerals may dissolve more quickly or slowly depending on the pH of the soil. Additionally, the activity of soil microbes can also impact nutrient availability.
One of the main benefits of using SRFs is that they provide a steady and sustained release of nutrients to plants, to maintain plant health whilst also reducing the risk of nutrient leaching. This is particularly important in areas where rainfall is high, as excess water can quickly wash away nutrients from the soil.
Another advantage of SRFs is that they are typically more cost-effective than other types of fertilisers. While they may be more expensive initially, their slow release nature means that they do not need to be applied as frequently, which can reduce overall fertilizer costs in the long term.
Overall, ICL’s slow release fertilisers offer a high-quality, reliable source of nutrients for plants, delivering consistent performance over time. With their gradual nutrient release and ability to withstand environmental factors, SRFs are an effective and sustainable option for maintaining healthy plant growth.
8 Products found

Sierraform GT All Season contains NPK in a normal-release form plus slow-release nitrogen and potassium, a full range of trace elements to improve turf health, plus magnesium for a boost to colour. It's ideal for use after aerating to encourage growth.

Sierraform GT Anti-Stress helps your turf through stress and helps keeps it in peak condition. The high potassium content is perfect in the summer or autumn, in areas of fine turf. The slow-release nitrogen supports growth for 6 – 8 weeks and minimises growth surges.

The micro-granules contain standard-release and slow-release nitrogen and potassium, plus all essential trace elements. K-STEP's low nitrogen content means compact growth and hardened turf, while its magnesium will boost colour and hide the symptoms of stress. Ideal all year round, on all fine turf.

The single-compound micro-granules are easy to spread quickly and evenly, and feature our patented MU2 and SilK coatings. Momentum contains NPK in a classic turf-friendly 4:1:2 ratio, with nitrogen and potassium in both standard-release and slow-release form, to feed your grass for up to 6 – 8 weeks. Also formulated with magnesium for a boost to colour and trace elements for optimum health. Suitable for any area of fine turf and especially useful in the spring and summer when grass grows most actively.

High phosphorus analysis to use as a preseeding fertiliser. Ideal to supply phosphate to the establishing young plant. Slow release nitrogen also to sustain early plant growth.

Ideal for fine turf application through the summer and autumn, supplying calcium, magnesium and trace elements particularly where these are indicated as required from soil testing. The excellent granulation means that low application rates can be employed. The response is a sustained turf response from the MU based nitrogen. The added SMX seaweed in the formulation aims to bring benefits from plant rooting and stress tolerance.

A granular fertiliser to get your growing season off to a great start. Sierraform GT Spring Start has iron and manganese to boost photosynthesis and colour, and low levels of MU to help your turf start getting greener even in cooler conditions. The product also contains slow-release potassium, as well as standard-release nitrogen and potassium. Phosphate-free, so it helps you manage phosphorus build-up. Spring Start comes as homogeneous micro-granules, featuring our patented MU2 and SilK coating technologies.

STEP Hi-Mag contains all the micronutrients required for healthy turf growth. Especially useful for preventing deficiencies in sand-based constructions.
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