Controlled release fertilizers (CRF) are a precision technology that shows environmental benefits in comparison to conventional fertilizers. CRFs release nutrients over a longer period of time thanks to an innovative coating technology. The release pattern closely matches the needs of turfgrass throughout its entire growth cycle.
Benefits of using CRFs are:
- Often only one application is required, as nutrients are released in a controlled manner over a longer period of time, giving the turf grass all nutrients it need, exactly at the right time.
- The controlled release technology significantly reduces nutrient leaching to both soil and groundwater.
- Greenkeepers and turf managers can benefit from high quality turf while lowering the environmental foot print in comparison to conventional fertilizers.
- As such, CRFs are part of the solution in helping meet the future target to reduce nutrient losses in EU agriculture by 50 percent, as set out in the Farm to Fork Strategy, the Zero Pollution Action Plan, and EU Soil Strategy for 2030.
NEW: eqo.s technology
ICL’s latest sustainable innovation for its controlled release fertilizers is eqo.s release technology. A revolutionary, fully biodegradable coating technology for turfgrass that breaks down very quickly once all nutrients are released.
6 Brands found
35 Products found

ProTurf12-5-20+2CaO+2MgO is for use from mid-May until mid-autumn, with high solubility, stress-busting magnesium and fine granules for greater impact per m².

ProTurf 15-6-15+7CaO+2.5MgO’s mini-granules deliver gradual nitrogen release thanks to their Poly-S coating, while magnesium provides sustained color and reduced stress.

ProTurf 20-0-7+3CaO+3MgO is the ideal first controlled-release fertilizer of the season, promoting healthy, balanced growth from early spring until mid-June.

SierrablenPlus Stress Control 4-5M prepares your turf for winter so you have lush green grass in time for spring.

Sierrablen 14-5-21+2MgO responds quickly even in lower temperatures, and ideal for the second half of the growing season, with magnesium for a quick blast of color.

Sierrablen 15-0-25+4MgO is fast-acting and perfect for application ahead of stressful conditions.

Sierrablen 16–25–12 is for laying new turf or over-seeding; it reduces the risk of burning your young grass, while phosphate boosts root growth and the controlled nitrogen release encourages rapid establishment and a dense sward.

Sierrablen 16-8-16+5MgO+0.5Fe is a balanced NK fertilizer for tees, fairways, and sports fields with magnesium and iron to boost color.

Sierrablen 22-0-20 has a balanced N and K content and is designed for optimum results from spring to autumn.

Sierrablen 22-6-11 provides enough nitrogen to feed your grass plants for 8-9 months, releasing it during optimal growing conditions.

Sierrablen 24-5-10+2Fe gives 4-5 months’ constant growth and is ideal for the first half of the growing season.

Sierrablen 27-5-5-Fe needs just one application a year, is a good base food at low rates and is compatible with other nutrients.

Sierrablen 28-5-5-Fe provides enough nutrition for the whole growing season in one application, with controlled nitrogen release for up to six months of constant growth.

Sierrablen 31-5-7 responds immediately, even in poor growing conditions, and promotes healthy, balanced turf growth at the start of the season.

Sierrablen 38-0-0 releases small amounts of readily available nitrogen and helps to pre-stress condition your turf.

Give your shrubs, field-grown trees, newly-planted stock, and other soil-grown crops a nutrient-rich boost with Sierrablen® Flora. This controlled-release fertilizer uses ICL’s patented PACE coating technology, ensuring your plants never lose out on their nutrient intake, even under increased soil moisture levels. No matter the soil type, your plants will receive all available nutrients at exactly the same rate. You can also use this product for topdressing or general maintenance dressing.

When seeking active growth for active endeavors, look no further than Sierrablen® Plus Active 3M. This high nitrogen and potassium controlled release fertilizer is ideal for spring and fall applications. With ICL’s patented Poly-S coating technology, your turf will benefit from a controlled 3-month nutrient release. Aid stress recovery and improve overall plant health thanks to its full trace element package. Boost your turf’s color and hide stress symptoms thanks to its added magnesium content.

When actively seeking active growth, reach for Sierrablen® Plus Active 4-5M. Thanks to ICL’s patented Poly-S coating technology, this controlled-release nitrogen and potassium-rich fertilizer provides a 4-5 month sustained nutrient release, ideal for both spring and summer applications. The included full trace element package means you can promote stress recovery and increase overall plant health. Hide stress symptoms and boost your turf’s vibrant color with its added magnesium content.

Sierrablen Plus Autumn & Winter is potassium-rich and designed for use in late summer and autumn ahead of winter, while the lower nitrogen content keeps growth steady.

Sierrablen Plus Mini 38-0-0 has controlled-release nitrogen for 2-3 months’ continuous growth during optimal growing conditions so you pre-stress condition the plant.

Start your turf on the right track with Sierrablen® Plus N-Start 3M mineral fertilizer. Aside from guaranteed all-round healthy growth, this high-nitrogen NPK formula is particularly designed to provide your turfgrass with rapid green-ups during strong growing periods or simply over spring, even under cooler conditions. Ensure a controlled 3-month nutrient release thanks to ICL’s patented Poly-S coating technology, giving rise to that perfect lush, dense sward.

Sierrablen Plus Renovator is designed for seeding, over-seeding and sodding with a balanced nitrogen and phosphorous analysis, making it ideal for turf renovation.

Sierrablen Plus Spring & Summer CalMag supports your turf’s growth early in the spring and summer for luscious and healthy grass.

Sierrablen Plus Spring & Summer boasts extended longevity thanks to the controlled-release nitrogen, maximizing healthy turf growth all season.

Get your growing season off to the perfect start with Sierrablen® Plus Spring Starter 3M. Equipped with ICL’s patented Poly-S and PACE technologies, this NPK fertilizer will provide your turf with a controlled nutrient release over a pre-defined 3-month period. With its high level of nitrogen, you can ensure a quick plant response, even in cooler conditions, allowing your turf to step into spring in an all-round healthy fashion.

Start the growing season as you mean to go on with Sierrablen® Plus Spring Starter 4-5M fertilizer. With the inclusion of ICL’s patented Poly-S and PACE technologies, you can provide your turf with a controlled nutrient release well into the summer months with its pre-defined 4-5 month longevity. On top of all-round, balanced, and healthy growth, you will also enjoy lush green swards thanks to its added magnesium content.

Sierrablen Plus Stress Control 3M helps you prepare for winter to get a lush green sward in the spring.

Sierrablen Plus Turf Starter is phosphorus-rich and ideal for achieving maximum rooting.

Sierrablen Plus Zero Phosphate N-Starter contains calcium and magnesium for healthy growth in the warmer months.

Sierrablen Plus Renovator is designed for seeding, over-seeding and sodding with a balanced nitrogen and phosphorous analysis, making it ideal for turf renovation.

Sportsmaster CRF Mini Active is a balanced NK fertilizer with P, for use from spring to autumn; its magnesium enhances turf color and masks stress symptoms while the calcium content strengthens plant cells to give your harder-wearing turf.

Sportsmaster CRF Mini High N yields quick reactions in cooler conditions, and encourages healthy, balanced growth at the start of the season.

Sportsmaster CRF Mini Spring Starter is the ideal first CRF of the season – its advanced technology ensures a swift reaction in cooler conditions.

Sportsmaster CRF Mini Start is ideal for over-seeding or laying new turf; it minimizes the risk of burning young grass while high phosphate levels promote strong root growth, and the trace element package improves grass health.

Sportsmaster CRF Mini Stress Control only releases nitrogen in favorable conditions, helping to pre-stress condition the plant so it resists extreme temperatures; high magnesium boosts color, while potassium helps water regulation and strengthens cells walls.