Why potassium sulfate is often smarter than potassium nitrate

Quick summary:

For sports turf, you want potassium to be stable and controllable, without growth spikes or unnecessary leaching risk. Potassium sulfate (K₂SO₄) tends to deliver a calmer, more consistent effect, while potassium nitrate (KNO₃) acts faster but is often shorter-lived and more “peak-prone” due to nitrate mobility.

Sports turf is all about control

In sports turf management, it’s all about consistent quality: stable growth, strong plant structure, stress tolerance, and avoiding peaks and dips. Yet in specifications and tenders, we still regularly see potassium nitrate (KNO₃) written in as an explicit requirement.

That steers the market toward one specific raw material, while agronomically, there are often better alternatives. In many sports turf applications, potassium sulfate (K₂SO₄) is simply the more logical choice.

1) The key difference isn’t potassium, it’s the “companion ion”

Both sources supply potassium (K). The real difference is what comes with it:

• Potassium sulfate (K₂SO₄) → potassium + sulfate

• Potassium nitrate (KNO₃) → potassium + nitrate

That companion ion strongly influences mobility, speed, and controllability in your fertilization program.

2) Nitrate is fast and highly mobile (which often means shorter effective performance)

Nitrate (NO₃⁻) dissolves immediately and moves easily with water through the soil. That typically results in:

• rapid uptake and a fast visible response

• a shorter effective window (what you apply can be “gone” faster via uptake or leaching)

• a higher chance of growth flushes followed by a drop-off

• under less favorable conditions, a higher risk of loss through leaching

On sports turf, a quick “kick” isn’t always a benefit. Most managers prefer steady, healthy growth and predictability.

3) Sulfate works calmer and fits better into a controlled strategy

Sulfate (SO₄²⁻) is less mobile than nitrate and does not trigger an immediate growth surge. That makes potassium sulfate a better fit for sports turf, because it:

• supports a more even growth pattern

• adds no extra nitrogen impulse

• integrates well with programs where nitrogen is managed separately (e.g., via CRF/SRF strategies)

Practically speaking: you deliver potassium where it’s needed, without automatically adding “extra growth pressure.”

Mini comparison: K₂SO₄ vs KNO₃ (sports turf)

Focus: mobility, controllability, and peak risk in turf nutrition programs.

Feature	Potassium sulfate (K₂SO₄)	Potassium nitrate (KNO₃)
Companion ion	Sulfate	Nitrate
Speed of response	Calm / even	Fast / immediate
Soil mobility	Lower than nitrate	Very high
Release behavior	More consistent, less peak-prone	More peak-prone, often shorter effective window
Nitrogen impulse	No	Yes (via nitrate)
Fit with controlled N strategy	Strong	Less logical (N is “attached” to K)
Leaching risk (companion ion)	Lower	Higher (nitrate)

Autumn and winter: why nitrate is often less desirable

In autumn and winter, the goal shifts from “pushing growth” to maintaining vitality: root health, stress tolerance, and a stable plant without soft growth. During this period, turf managers often want less nitrate-driven growth, because conditions (temperature, light, uptake capacity) are less favorable and the risk of nutrient loss increases.

Potassium sulfate fits this seasonal approach well: you support potassium function without a direct nitrate impulse, helping you keep calm and control in the program.

Specifications: focus on function, not one raw material

A tender that literally requires “potassium nitrate” focuses on the means rather than the goal. In sports turf, the goal is typically:

• consistent potassium availability in the rootzone

• limited peak effects

• low leaching sensitivity

• smooth integration into a controlled nutrition plan

Conclusion

On sports turf, potassium should be stable, predictable, and controllable—without unwanted peaks. That’s why potassium sulfate is in many cases a more practical and agronomically stronger alternative than potassium nitrate, especially when nitrogen is managed separately through a controlled strategy.

Want to know which potassium strategy best fits your field, season, and management goals? We’re happy to help with a practical fertilization plan and if desired, support it with soil and/or plant sap measurements.

Contact Our Technical Manager

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Better Spread, Better Fertilization

Does size matter? It may sound playful, but in controlled-release fertilizers it points to something essential: granule size and, even more importantly, how many granules you apply per gram.

Modern CRF technology focuses on coatings, osmotic processes and release curves, but true nutritional uniformity starts with something much simpler. It’s the number of contact points on the field or in the growing medium, the number of granules within a single gram of fertilizer.

More granules means more precision

A CRF granule is not just a pellet. It is a micro-reservoir of nutrients that releases over several months. When you apply fifteen or sixteen of those reservoirs per gram, the feeding pattern across the crop looks very different compared to applying forty or more.

Mivena compared several similar CRF products, all with six-month longevity and all fully coated NPK formulas. Each product was tested by counting exactly one gram of granules. The results were striking.

Results:

Horti-Cote Plus 16-6-11 → 41 granules per gram
O-cote Exact Standard 15-9-12 → 28 granules per gram
M-Cote 15-9-15 → 17 granules per gram
E-kote 15-9-14 → 16 granules per gram

The conclusion is simple. When the same amount of nutrients is divided over smaller and more uniform granules, you create more contact points in the root zone. More contact points lead to a more even nutrient supply. And a CRF that falls more evenly performs more evenly.

The comparison speaks for itself. At the same weight, Durable® CRF 44-0-0 delivers roughly four times more granules than Cote-N 42-0-0. More granules mean more contact points, a finer spread pattern and noticeably more uniform feeding across the treated area. This simple physical difference directly translates into more consistent plant performance.

Impact on growth, colour and root development

Plant performance is highly sensitive to variations in nutrient distribution. A finer granule distribution leads to more uniform colour, more consistent leaf mass and fewer visible patches. In both turf and horticultural crops, a higher granule count results in steadier growth and predictable biomass production.

Roots benefit as well. When nutrients are released evenly, stress is reduced and plants develop a more balanced root system. This effect is especially important in soft fruit, pot plants and young plants where uniformity is critical.

Visual of spread quality

The Durable CRF visualization shows clearly how granule count affects real-world spreading. A product with about 120 granules per gram creates a near pixel-like coverage, while one with only thirty leaves gaps and clusters.

This difference in physical spread leads to noticeable differences in plant response, not because the formulation changes, but because the distribution does.

Why Mivena focuses on high granule density

In Horti-Cote Plus and Durable CRF, Mivena intentionally uses compact, high-density granules. Each particle is fully coated and engineered for controlled nutrient release. By increasing the number of granules per gram, feeding becomes more stable, more predictable and ultimately more efficient.

Conclusion: Does size matter?

Yes, size matters, especially when it comes to performance.

CRF performance is not driven by chemistry alone. It also depends on a physical reality that is often overlooked: how evenly the nutrition is distributed. The difference between sixteen and forty-one granules per gram is the difference between average uniformity and true professional precision.

Granule count determines spread quality. Spread quality determines growth quality. And that makes granule size and granule density one of the most underestimated performance factors in controlled-release fertilizers.

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Timing is everything

By October, the turf season begins to split: some courses slow down, others stay busy. But beneath every fairway, green, or pitch, the same challenge emerges—how to protect turf nutrition through winter and make sure growth restarts cleanly in spring.

That preparation begins now.
A single fall application of a 4-month controlled-release fertilizer (CRF) can make the difference between a sluggish comeback and a smooth, early lift-off when temperatures rise again.

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The science behind it: temperature-responsive nutrition.

Our Durable® coating technology adapts naturally to soil temperature.
As autumn progresses and soil cools toward 7–10 °C, nutrient diffusion through the coating slows dramatically. That means the product “waits” with the turf. Feeding less when growth is minimal.

Then, as soon as the soil warms again, the release rate accelerates in sync with turf demand.
The result?

• Minimal nutrient loss in winter, even under wet conditions.
• Balanced feeding, without the common peaks and dips of conventional fertilizers.
• Consistent early color and growth once spring returns.

Why choose a 4-month CRF?

Because it’s perfectly tuned to bridge the coldest period of the year.
Apply in fall, and your turf carries the nutrients safely through winter, ready to fuel early spring growth. It’s a low-effort, high-impact strategy that saves labor, reduces washout risk, and keeps turf health stable during dormancy.

It’s not about feeding more. It’s about feeding smarter.

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One principle, different climates.

Europe has no single “perfect” application date.
The 4-month CRF adapts to local soil temperature, not the calendar. But here’s a practical guide:

Region	Best Application Window
Northern / North-Eastern Europe	Mid October
Central / Western Europe	Late October – Early November
Southern Europe	November – Early December

The key? Let soil temperature fine-tune your timing.

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The payoff: a faster start in spring.

When the mowers roll out again, courses treated in autumn will already show stronger recovery, denser color, and fewer uneven patches.
That’s the Durable® advantage—science that works with nature’s rhythm, not against it.

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Why Silica (Si)?

Silicon isn’t classified as an essential nutrient like nitrogen or potassium. But its benefits? Far from optional. Once absorbed by the roots, silica travels through the xylem and is deposited into the cell walls, acting as a microscopic shield.

• Stronger plant cell structure
• Enhanced resistance to disease and environmental stress
• Improved mowing quality and upright growth
• Greater wear tolerance and recovery speed

Thanks to the addition of 4% Si, this Granuform formulation goes beyond conventional SRF products. The slow and consistent nutrient release also includes silica, supporting continuous plant fortification from the inside out.

What does it mean on the field?

• Reduced incidence of foliar diseases, including Pyricularia grisea (gray leaf spot)
• Denser turf canopy with greater resilience
• Harder, more robust leaf blades that resist tearing or wilting
• Consistent turf performance, even under high-stress conditions

“Greens treated with Granuform + Si show a firmer surface, improved ball roll, and better recovery after wear,” shared one greenkeeper from Scandinavia.

Ideal for fine turf

Granuform 16+0+22+2MgO+4Si is formulated for use on:

• Golf greens and tees
• Bowling greens
• Short-cut football or hockey fields
• Any sports surface where precision meets performance

Alongside calcium, magnesium and iron, the addition of silica strengthens plant structure and resilience. It also stimulates lignin biosynthesis, which enhances cell wall elasticity, crucial for both growth and mowing tolerance.

Download the full product datasheet (TDS)

Need tailored advice for your turf program? Contact your local distributor or your Mivena representative.

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Just like humans need a balanced diet of vitamins, proteins, carbohydrates, and water, plants require their own mix of essential nutrients to thrive. From major nutrients like nitrogen and potassium to supporting elements like magnesium and zinc, each plays a unique and critical role in plant health. And, as with human nutrition, it’s not just about having these nutrients but having them in the right balance for maximum benefit.

A well-nourished plant is resilient, vibrant, and capable of withstanding environmental stress while yielding abundantly. Let’s explore why every nutrient – from the macros to the micros – is essential for lush, healthy plant growth and how balanced fertilization can make all the difference.

Macronutrients: The Foundation of Plant Growth and Productivity

The three primary macronutrients – nitrogen (N), phosphorus (P), and potassium (K) – are foundational for plant structure and function. Each of these elements contributes uniquely:

• Nitrogen (N) supports lush foliage, chlorophyll synthesis, and photosynthesis, contributing to a plant’s vitality and vibrant green color. However, excessive nitrogen can lead to rapid, weak growth, making plants susceptible to disease.
• Phosphorus (P) is critical during early growth stages, aiding root development and energy transfer within the plant via ATP. This nutrient is especially valuable in spring when plants establish their root systems.
• Potassium (K) fortifies cell walls and regulates water balance, enhancing drought and frost resistance. Potassium is essential for structural integrity, particularly in turfgrass, where it promotes robust root development and disease resistance.

While macronutrients drive primary growth, meso- and micro-elements play supporting roles that enable efficient nutrient absorption and overall plant resilience.

Mesonutrients: Supporting and Balancing Nutrient Uptake

Calcium (Ca), magnesium (Mg), and sulfur (S) are the mesonutrients that support macronutrients by balancing plant processes and enhancing nutrient uptake:

• Calcium (Ca) plays a vital role in nutrient absorption and soil pH regulation. It promotes strong cell walls and healthy roots; a calcium deficiency can lead to brittle roots and limited nutrient intake.
• Magnesium (Mg), a core component of chlorophyll, supports photosynthesis and nutrient utilization, particularly for nitrogen and phosphorus. Magnesium’s balance with calcium is crucial to avoid nutrient uptake interference.
• Sulfur (S) aids in amino acid and protein synthesis, supporting plant growth and disease resistance. Particularly in sandy soils prone to leaching, sulfur is essential to prevent deficiencies that can result in yellowing leaves and stunted growth.

These mesonutrients, though less prominent, play an essential role in supporting plant health and maximizing the effects of macronutrients.

Micronutrients: Precision in Plant Growth

Micronutrients, though needed in trace amounts, are crucial for specific plant functions. Notable micronutrients include:

• Iron (Fe) and manganese (Mn), essential for photosynthesis and nitrogen use.
• Boron (B) and zinc (Zn), aiding in cell growth, enzyme activation, and sugar transport.
• Copper (Cu), supporting chlorophyll production and cell wall strength.
• Molybdenum (Mo), though needed in tiny amounts, is essential for nitrogen fixation and enzyme function, particularly for legume crops.

In What Proportions do the Elements Occur in the Plant

Achieving Balance: A Holistic Approach to Plant Fertilization

According to Liebig’s Law of the Minimum, plant growth is limited by the least available nutrient, while the Law of the Maximum warns of nutrient excesses that can inhibit nutrient uptake and harm plant health. Therefore, a balanced fertilization plan is essential, ensuring that all elements are available in the correct proportions for the crop and growth stage.

In essence, plant fertilization goes beyond nitrogen, phosphorus, and potassium. By including the full spectrum of nutrients, we empower plants to achieve their full potential, enhancing their health, resilience, and productivity in any season.

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Introduction

Introduction

After an unusually wet spring, many lawns in the Netherlands are facing fungal problems. From snow mold to red thread and leaf spot, these fungi all have one thing in common: they attack grass that is weakened by poor root development. In this blog, we explain how you can protect and restore your lawn, and how the right nutrition and aeration can help bring it back to health.

Fungal Problems in Your Turf: What’s Going On?

Due to the heavy rainfall of recent months, the soil in many areas has become compacted, leading to weak root development in the grass. Now that temperatures are rising, the risk of fungal infections like snow mold (Microdochium nivale), red thread (Laetisaria fuciformis), and leaf spot (Drechslera spp.) is increasing. These diseases thrive in damp environments where the grass is not strong enough to defend itself.

Why is Root Development So Important?

A well-developed root structure is crucial for a healthy lawn. Grass with strong roots can efficiently absorb nutrients and water, making it more resistant to diseases and fungi. However, due to the wet spring, root development has been less than optimal in many cases, leading to reduced absorption of essential nutrients such as calcium, one of the most critical building blocks for strong cell walls. Weak cell walls make the grass more susceptible to fungal infections.

Restore Your Turf with Granusol 10+52+10+MgO+MV10

To stimulate root growth and enhance your turf’s resistance, we recommend using Granusol 10+52+10+MgO+MV10. This specialized fertilizer is designed to help grass recover quickly under stressful conditions and strengthen it.

What Makes Granusol 10+52+10+MgO+MV10 So Effective?

2. High Phosphate Content (52%): Phosphate is essential for developing a strong root system, which is crucial for a healthy lawn that can resist diseases.

2. Sulfate for Fungal Control: Sulfate helps inhibit fungal growth, preventing further infections.

3. Magnesium Oxide (MgO): Magnesium oxide supports chlorophyll production, enhances photosynthesis, and contributes to the overall health of the turf. It promotes a deeper green color and strengthens the grass, especially during stressful conditions like drought or heat.

MV10 Vitamins: This unique blend of vitamins improves nutrient absorption by the grass, especially under stress conditions. It promotes faster recovery, strengthens cell walls, and enhances the turf’s overall resistance to fungal attacks.

Want to know more about Granusol 10+52+10+MgO+MV10? Check out our product page here: mivena.nl/search-by-product/

Granusol 10+52+10+MgO+MV10: mivena.nl/wp-content/uploads/2024/08/Granusol-105210MgO

Aeration: The Key to Success

In addition to the right nutrients, aerating the soil is crucial. Compacted soil restricts the flow of water and oxygen, suffocating the roots and hindering growth. By regularly aerating your lawn, you ensure that the roots receive enough oxygen and nutrients, which is essential for recovery and growth.

Effective Aeration Tips:

– Use a lawn aerator or spiked roller to loosen the soil.

– Combine aeration with the application of Granusol 10+52+10+MgO+MV10 for better recovery.

– Perform this action in the fall or early spring for the best results.

Foliar Feeding: Rapid Nutrient Absorption

In addition to soil-based feeding, foliar feeding can help provide your lawn with essential nutrients more quickly. This method is particularly useful under stressful conditions when root activity is limited. Foliar feeding ensures that nutrients are absorbed directly through the leaves, allowing the lawn to benefit more rapidly from the essential nutrients.

Want to learn more about foliar feeding? Download our leaflet here: mivena.nl/foliar-leaflet

Conclusion

A healthy lawn starts at the roots. By ensuring strong root development, proper nutrition with Granusol 10+52+10+MgO+MV10, and adequate aeration, you give your grass the best chance to recover from fungal problems and develop into a healthy, strong lawn. Prevent fungal infections by taking preventive measures and actively maintaining your turf, even during the winter months.

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The best start for your golf green!

Granuform®SRF is best suited to low-cut, fine turf areas, such as golf greens, due to its uniform and dust-free, fine 0.5-1mm granules. Available in several different analyses for each season, this beautiful Mivena product contains methylene urea (MU), the most reliable form of slow-release nitrogen, giving it a longevity of up to 12 weeks.

Granuform®SRF in a nutshell:

• High percentage of methylene urea (MU)
• Very reliable slow-release nitrogen
• Fine, dust-free 0.5-1 mm granules
• Longevity of 10-12 weeks
• Product range contains silicon (Si)

Granuform®SRF Cold Start 11+5+5+3MgO+7CaO+8Fe
https://www.mivena.nl/wp-content/uploads/2023/06/11-5-5-3-MgO-7-CaO-8-Fe.pdf

• Magnesium and iron for a dark-green colour
• Calcium for optimal cation balance and vital crop

The post Granuform®SRF Cold Start 11+5+5+3MgO+7CaO+8Fe appeared first on Mivena | Specialty fertilizer company.

Ready for the next 20 years and beyond with our biodegradable Durable®CRF coating

The first product to come off the Mivena production lines more than 20 years ago was our Granucote®CRF 23+5+12+2MgO+Fe+Mn, 8-9M seasonal fertilizer.

This highly-coated, long-lasting seasonal fertilizer is still the pride of our company to this day.

The distinctive character of Granucote®CRF seasonal fertilization lies in:

• Ongoing, consistent release over a longer period (8-9 months)
• High proportion of coated nitrogen
• Maximum nitrogen efficiency and a very sustainable choice
• Apply once per season, low carbon footprint (winter application optional)
• Biodegradable Durable®CRF coating

Ongoing, consistent release over a longer period
To this day, there are no comparable products on the market that can match the steady release from start to finish during the season. This makes Granucote®CRF unique in the market.

Granucote®CRF – minimized nitrate NO₃, less risk of turf grass diseases
High nitrate levels in early spring can increase the potential risk of turf grass diseases and should be avoided. In early spring, plant crop growth is still minimal, which easily results in an imbalance in grass plants.

Granucote®CRF seasonal (one-application) products:

• Granucote®CRF 23+5+12+2 MgO+0.5 Fe + 0.1Mn 8-9M
• Granucote®CRF 28+6+6+2 MgO+0.5 Fe 8-9M
• Granucote®CRF 31+5+5+2 MgO+0.5 Fe 8-9M

Safe in extreme weather conditions
The added value of Granucote®CRF is most visible in extreme weather conditions, such as drought and extremely high rainfall

The post Granucote®CRF Full Season, 8-9 months – Our flagship product for 20+ years appeared first on Mivena | Specialty fertilizer company.

Granusol®WSF foliar fertilizers are a welcome tool

Where soil balance is the starting point, Granusol®WSF foliar feeding can be a great help under conditions where your turf needs that little bit extra.

The pressure to phase out the use of pesticides in public spaces (including golf courses and sports pitches) is radically increasing all over Europa. This all started with a European Union Directive in 2000, aimed at improving water quality. As a result, each member state is now working hard to minimize the use of pesticides.

Similar to us humans, good nutrition is the basis for good health. Although we ourselves might occasionally be tempted to eat something less healthy, our turf is much more under our control.

What is foliar feeding?

Foliar feeding, also called ‘foliar fertilization’, is another method to apply fertilizers to plants besides the more regular method via the plant’s roots. Sometimes a (temporary) need for change in fertilization is observed, as a result of poor nutrient intake via the crop’s roots. This could be caused by:

• weak roots
• quick plant growth
• young and underdeveloped roots
• high pH in the root environment
• high pressure on the crop due to stress factors.

Benefits of foliar feeding

Foliar feeding has several benefits, including:

• quick nutrient intake
• low amount of energy needed to transport nutrients, as they are in the right place immediately
• non-mobile nutritional elements remain in the plant
• high utilization of nutritional elements
• zero-risk for fixation in the soil or substrate

Easy to mix and apply with a wide range of analyses, Granusol®WSF is the ideal product for foliar feeding fine turf. Granusol®WSF is a 100% crystalline fertilizer. Moreover, Mivena offers two different liquid fertilizers. Besides N, P, K, MgO and Calcium, Granusol®WSF also contains trace elements in the chelated forms EDTA, DTPA and EDDTA. This means they remain available for the plant at all times and any common pH level. Granusol®WSF can be used either as a total fertilizer or as extra feed in addition to Mivena’s CRF products. Finally, Granusol®WSF contains MV10, which enhances the uptake and effectiveness of nutrients and trace elements.

Granusol®WSF in a nutshell:

• air-conditioned production and in vacuum-sealed packaging, so no caking
• high-quality crystalline powder, 100% water soluble
• calcium easily absorbed by the plant
• MV10 – combination root stimulators
• trace elements in three different chelated forms.

Granusol@WSF foliar analyses:

Granusol®WSF 27+15+12+1MgO+TE+MV10

Recommended rate turf care: 10 – 20 kg/ha

Granusol®WSF 20+0+20+1MgO+TE+MV10

Recommended rate turf care: 10 – 20 kg/ha

Granusol®WSF 12+7+25+2MgO+8CaO+TE+MV10

Recommended rate turf care: 10 – 20 kg/ha

For foliar applications, low water volumes (300 – 600 l/ha) should be used, and in order to optimize uptake, high temperatures and too much sun light should also be avoided.

Always carry out a small-scale trial first, before changing the recommended rate or any other variables. As circumstances may differ and the application of our products is beyond our control, Mivena cannot be held responsible for any adverse results.

For more information, please contact your technical support.

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