As a highly specialized nitrogen-sulphur compound, BASF Ammonium Sulphate Nitrate (ASN) serves as a core pillar within modern mineral fertilizer systems. Engineered specifically for strategic early spring applications, it combines instant-release nitrate, steady-release ammonium, and highly bioavailable sulphate sulphur. This unique chemical synergy prevents growth stalls during unpredictable early-season cold snaps. For growers looking to buy high-efficiency nitrogen fertilizer, BASF ASN provides a professional-grade solution for targeted nutrient management.
At a Glance: Key Benefits of BASF ASN
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Dual-Action Nitrogen: Contains 26% total nitrogen split perfectly between immediate boost and steady soil release.
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Sulphur-Powered Efficiency: 13% integrated sulphur activates plant enzymes, ensuring no nitrogen goes to waste.
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Dust-Free Premium Granules: Excellent storage stability and perfectly calibrated for easy spreading by hand or push-spreader.
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Home Garden Safe: Fully approved for domestic use in lawns and vegetable patches with no regulatory restrictions.
How It Compares: Choosing the Right Nitrogen System
When planning your early spring lawn care or managing high-yield vegetable beds, nutrient efficiency is everything. Unlike standard multi-nutrient mixes or generic all-purpose fertilizers, BASF ASN allows you to target severe nitrogen deficiencies directly without overloading your soil with unwanted phosphates.
| Fertilizer Type |
Nutrient Availability |
Leaching Risk & Efficiency |
Market Availability |
| BASF Ammonium Sulphate Nitrate (ASN) |
Instant & Sustained: Nitrate works immediately; ammonium feeds for weeks. |
Very Low: Ammonium binds firmly to soil particles, while sulphur boosts uptake. |
Freely available for standard online and retail purchase. |
| Calcium Ammonium Nitrate (CAN) |
Fast: Pure nitrogen response but lacks the vital sulphur synergy. |
Moderate: High risk of nitrate washing away into deeper soil layers during heavy spring rains. |
Subject to local regulations and quantity restrictions in certain regions. |
| Urea |
Delayed: Requires enzymatic breakdown in the soil before plants can absorb it. |
Elevated: High risk of gaseous ammonia loss if left on the surface without immediate watering. |
Widely available, but requires a strict, narrow weather window for application. |
The Science: The Nitrogen-Sulphur Synergy Explained
The outstanding performance of BASF ASN comes down to a fundamental botanical rule: Plants cannot physically process nitrogen into strong, healthy growth without a matching supply of sulphur. This product functions as a highly precise sulphur fertilizer for gardens, unlocking your soil's true potential:
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Optimized Protein Synthesis: The 13% water-soluble sulphate is absorbed simultaneously with the nitrogen. This perfect timing allows the plant to instantly build amino acids and chlorophyll, resulting in a rapid, deep-green canopy.
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Weather-Independent Delivery: While the 7,5% nitrate jumpstarts the plant right away, the 18,5% ammonium attaches to the soil's clay-humus complexes. This creates a natural nutrient reservoir that slowly releases as the soil warms up.
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Rhizosphere Activation: As soil microbes convert the ammonium (nitrification), a mild, beneficial acidification occurs directly around the roots. This temporary drop in pH helps unlock locked-up micronutrients like iron, manganese, and phosphorus, making them easily accessible.
Best Uses:
Recommended Applications
- As a heavy-duty spring lawn fertilizer to repair winter damage
- Feeding nitrogen-hungry crops like cabbage, leeks, onions, and rhubarb
- Boosting fruit trees, berry bushes, and ornamental shrubs early in the season
- Balancing neutral to alkaline (lime-rich) garden soils
Limitations:
Not Recommended For
- Hydroponic setups or closed, soil-free indoor growing systems
- Houseplants or small patio containers lacking proper bottom drainage
- Extremely acidic, sandy soils unless paired with regular liming
- Direct granule contact with wet foliage (to prevent leaf scorching)
Application Rates & Guidelines
For best results, always apply the dust-free granules onto completely dry foliage. We highly recommend using a calibrated push-spreader to ensure even distribution and prevent localized over-fertilization. Water the treated area thoroughly immediately after application to dissolve the granules and wash the nutrients straight to the root zone.
Crop-Specific Dosage Guide:
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Established Lawns: Apply 35–55 g/m² at the very start of the growing season (March/April). A light touch-up of maximum 20 g/m² can be applied after heavy summer usage.
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Heavy-Feeding Vegetables: Work 50–70 g/m² lightly into the top layer of soil prior to planting or sowing.
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Light-Feeding Vegetables (e.g., Radishes, Beans): Limit to a maximum of 20 g/m² during bed preparation to avoid nitrate accumulation in the leaves.
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Fruit Trees & Ornamental Shrubs: Scatter 30–40 g/m² evenly underneath the entire canopy branch spread in early spring.
Soil Compatibility & pH Management
BASF Ammonium Sulphate Nitrate works exceptionally well on alkaline, neutral, and heavy clay soils. Its natural, mild acidifying effect in the root zone acts as a vital tool for overall soil improvement strategies, reactivating dormant nutrient reserves.
Important Note for Light, Sandy Soils:
If your garden consists of naturally acidic, sandy soil, long-term use of ASN should be accompanied by routine maintenance liming to counteract the gradual drop in soil pH.
Technical Specifications
| Specification |
Details / Values |
| Manufacturer |
BASF SE |
| Fertilizer Type |
Mineral Ammonium Sulphate Nitrate (ASN) |
| Total Nitrogen (N) |
26% |
| - Nitrate Nitrogen (NO₃-N) |
7.5% (for immediate, rapid plant response) |
| - Ammonium Nitrogen (NH₄-N) |
18.5% (for sustained, weatherproof feeding) |
| Total Sulphur (S) |
13% (fully water-soluble sulphate) |
| Formulation |
Granular, dust-free specialized compound |
| Storage |
Keep in a cool, dry place sealed tight against moisture (hygroscopic) |
Frequently Asked Questions (FAQ)
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When should I apply nitrogen fertilizer in the spring?
The ideal window opens between March and April, as soon as consistent soil temperatures reach about 5 °C. This aligns perfectly with the start of root activity, allowing plants to absorb the nutrients instantly.
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What happens if I over-apply nitrogen to my lawn?
Accidental overdosage causes chemical leaf burn, turning grass blades brown or black. Long-term excess creates weak, bloated plant tissues, making your lawn highly susceptible to fungal diseases and reducing its wear tolerance.
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How does BASF ASN perform during cold early-spring spells?
This is where the fertilizer excels. While organic alternatives rely on warm weather for soil microbes to break them down, the nitrate in ASN moves purely via water flow into the roots, sparking growth even in chilly conditions.
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Can I mix this fertilizer with garden lime or apply them together?
No. You must wait at least 3 to 4 weeks between liming and applying ammonium-based fertilizers like ASN. Mixing them causes a direct chemical reaction that converts the valuable nitrogen into ammonia gas, wasting it into the air.
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How long does the feeding effect of BASF ASN last?
While the nitrate portion is consumed within the first few days for a visible green-up, the ammonium portion continuously feeds your plants over a span of 6 to 8 weeks, safely regulated by soil temperature and moisture.
Product safety information
Manufacturer information:
BASF SE
Ludwigshafen, , 67056
https://www.basf.com/global/de
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