THERMO 8-0-30 + 4Mg: anti-stress fertilizer for summer turf fertilization

THERMO Granular fertilizer designed to support turf during the hottest periods. Ideal for accompanying lawns in the run-up to summer, helping to maintain color, nutritional balance, and greater resistance to heat stress. Discover the technical data sheet

Targeted nutrition to protect turf during heat, drought, and water stress

Summer turf fertilization requires a different technical approach compared to spring or autumn fertilization. During the hottest months, the lawn is exposed to particularly critical environmental conditions: high temperatures, intense solar radiation, increased evapotranspiration, and possible reduced water availability in the soil.

At this stage, the agronomic goal is not to stimulate intense vegetative growth, but to support the plant in maintaining its physiological balance. For this reason, it is essential to choose a specific summer fertilizer that can nourish turf gradually and improve its resistance to stress.

THERMO 8-0-30 + 4Mg is a professional turf fertilizer formulated for the most challenging climatic periods. Its composition, characterized by nitrogen exclusively in slow-release form, high potassium content, magnesium, and the absence of phosphorus, makes it particularly suitable for the summer nutrition of ornamental, sports, and professional lawns.

Why lawns suffer during summer

During summer, turf naturally reduces its metabolic activity in order to adapt to high temperatures. As heat increases, the plant tends to limit water loss and slow down certain physiological processes, especially in the presence of water stress or suboptimal irrigation.

The main summer stress factors are:

• high air and soil temperatures;
• increased evapotranspiration;
• reduced cell turgor;
• slowdown of root activity;
• greater sensitivity to wilting;
• loss of color, density, and uniformity of the turf.

Under these conditions, unsuitable fertilization can worsen the plant’s response. The use of fertilizers that are too rich in readily available nitrogen, for example, can push the lawn to produce new leaf mass precisely when it should be limiting water consumption and preserving energy.

Summer fertilization should therefore follow an anti-stress approach: nourishing without forcing growth.

Slow-release nitrogen: why it is essential in summer

Nitrogen is an essential element for turf because it contributes to the synthesis of proteins, enzymes, and chlorophyll. However, during the warm months, what matters is not only how much nitrogen is applied, but above all how it is released.

THERMO contains slow-release nitrogen, an essential feature for summer lawn fertilization. Gradual release allows the plant to receive nutrients steadily, avoiding sudden nutritional peaks.

In summer, fast-acting nitrogen can cause excessive leaf growth. This increases the plant’s transpiring surface and, consequently, its water requirements. In addition, overly rapid growth can produce softer, less resistant tissues, making turf more vulnerable to heat and physiological stress.

Using nitrogen exclusively in slow-release form means:

• maintaining more regular nutrition;
• reducing the risk of excessive vegetative stimulation;
• limiting the increase in water requirements;
• encouraging more balanced growth;
• supporting color and vitality without weakening the plant;
• optimizing turf maintenance management.

In summer, proper fertilization does not mean accelerating growth, but helping the lawn through a phase of resistance. This is why slow-release nitrogen represents a safer, more efficient agronomic choice, fully aligned with the plant’s real needs.

Why fast-acting nitrogen should be avoided during hot months

When temperatures are high, turf must carefully manage its water balance. Immediate nitrogen availability can disrupt this balance by stimulating the production of new vegetative tissues at an unfavorable time.

A lawn that is excessively pushed during summer tends to consume more water, requires more frequent mowing, and may show greater sensitivity to yellowing, loss of vigor, and heat stress. In addition, an excess of readily available nitrogen can encourage vegetative imbalances and increase susceptibility to plant health issues.

Choosing a slow-release nitrogen source instead allows the turf to remain nourished yet stable, avoiding aggressive interventions and respecting the plant’s physiological rhythm during the summer season.

High potassium content: the key nutrient against summer stress

THERMO’s formulation stands out for its high potassium content. This element plays a fundamental role in turf resistance to environmental stress.

Unlike nitrogen, potassium does not directly stimulate vegetative growth. Its function is mainly regulatory: it is involved in osmotic processes, water management within the plant, enzyme activation, and the regulation of stomatal opening and closing.

Stomata are essential structures for gas exchange and transpiration. In conditions of intense heat, their proper regulation allows the plant to limit water loss and maintain greater physiological efficiency.

An adequate potassium supply helps turf to:

• improve water balance management;
• maintain cell turgor;
• reduce the risk of wilting;
• increase tolerance to heat stress;
• support stomatal function;
• preserve the aesthetic quality and resistance of the lawn.

For this reason, in summer turf fertilization programs, potassium is considered one of the most important elements for stress prevention.

Potassium and cell turgor: physiological protection for the lawn

One of the most important effects of potassium concerns the maintenance of cell turgor. Turgor is the internal pressure exerted by water inside plant cells and is essential for keeping tissues active, elastic, and functional.

During periods of intense evapotranspiration, the plant may lose water more quickly than it can absorb it from the soil. This imbalance leads to loss of turgor, wilting, and a decline in the visual quality of the turf.

Potassium-rich nutrition helps the plant better regulate its water potential, improving its ability to cope with the most critical phases of summer. In this sense, THERMO acts as an anti-stress fertilizer, helping to prepare the lawn before heat damage becomes visible.

Magnesium and sulfur: support for turf metabolism

In addition to nitrogen and potassium, THERMO provides MgO and SO₃.

Magnesium is a central element in the chlorophyll molecule and contributes to the photosynthetic function of the plant. In summer, when turf may experience metabolic slowdowns, a correct magnesium supply helps support lawn color and physiological efficiency.

Sulfur contributes to the synthesis of amino acids and proteins, supporting various metabolic processes. Its presence completes the formulation, making nutrition more balanced and functional.

Why THERMO contains no phosphorus

THERMO has an 8-0-30 + 4Mg analysis, meaning it does not supply phosphorus. This choice is consistent with its use on established turf and with the typical nutritional needs of the summer period.

Phosphorus is particularly important during germination, rooting, and lawn establishment. During the warm season, however, the main objective is not to promote new roots or stimulate growth, but to improve the plant’s resistance to environmental stress.

The absence of phosphorus allows fertilization to focus on the elements that are truly strategic for summer: slow-release nitrogen, potassium, magnesium, and sulfur.

When to use THERMO

THERMO is suitable for summer turf fertilization programs, particularly in the periods preceding or accompanying the most critical climatic phases.

It can be used on:

• ornamental lawns;
• sports turf;
• professional green areas;
• surfaces subject to heat stress;
• lawns exposed to high evapotranspiration;
• turf requiring greater summer resistance.

Preventive application is particularly important: intervening before heat peaks allows the plant to face summer with a better nutritional supply and a greater capacity to respond.

THERMO: professional nutrition for a more resistant lawn

THERMO 8-0-30 + 4Mg has been developed to meet the needs of turf during periods of greater climatic stress. The presence of nitrogen exclusively in slow-release form allows gradual and controlled nutrition, while the high potassium content supports the plant’s main physiological defense mechanisms.

This combination makes THERMO particularly suitable for summer lawn fertilization, when it is necessary to maintain vegetative balance, resistance, and aesthetic quality without stimulating excessive growth.

Conclusion

Summer turf fertilization must be based on precise agronomic criteria. During the hot months, the lawn should not be forced, but supported with nutrients capable of improving its resistance to stress.

Slow-release nitrogen nourishes the plant progressively, avoiding vegetative peaks and reducing the risk of imbalances. Potassium, on the other hand, plays a central role in water regulation, cell turgor maintenance, and heat tolerance.

Thanks to its 8-0-30 + 4Mg formulation, THERMO represents a professional solution for summer turf fertilization, ideal for keeping lawns healthier, more balanced, and ready to face the most difficult conditions of the season.