Calcium Ammonium Nitrate Selection Guide:The Scientific Mechanism of Nitrogen–Calcium Synergy and the Adaptation of 27% / 15.5% Grades

I. Introduction: The Global Challenge of “Nitrogen–Calcium Balance”

In the vineyards of Chile’s Central Valley, growers often suffer significant losses due to grape cracking; in Oregon’s blueberry fields, fruit frequently rots during transport because of insufficient firmness; in mango orchards of Rayong Province, Thailand, malformed fruit continues to affect harvest quality; while in the citrus groves of New South Wales, Australia, bitter pit has long been a major barrier to achieving high-quality yields.

These cultivation problems scattered around the globe may appear to have different causes, but they all point to the same core contradiction — nitrogen–calcium imbalance

For a long time, growers worldwide have fallen into two fertilization pitfalls:

• In pursuit of vigorous plant growth, they overapply nitrogen fertilizers, which may lead to rapid leaf expansion but suppress calcium uptake by the roots, thereby worsening fruit cracking, malformation, and other quality issues.

• Once aware of the importance of calcium supplementation, some apply calcium fertilizers alone; yet without the synergistic effect of nitrogen, calcium ions struggle to move from roots to fruits, with most retained in the soil, resulting in poor fertilization efficiency.

As a representative fertilizer providing simultaneous nitrogen and calcium supplementation, calcium ammonium nitrate (CAN) offers an effective solution to this dilemma. However, two main market formulations often leave growers uncertain:

• The 27% grade, with total nitrogen ≥27% and calcium 5%–8%.

• The 15.5% grade, with total nitrogen ≥15.5% and calcium ≥18.0% (equivalent to CaO ≥26%).

The difference between them originates from divergent agricultural production needs — the 27% grade is suited to scenarios requiring rapid, short-term nitrogen supply, while the 15.5% grade is more aligned with cultivation goals that balance quality and yield.

This article, supported by scientific principles, analyzes the crop nutritional mechanisms of nitrogen–calcium synergy, objectively compares the characteristic differences and application scenarios of the two formulations, and helps growers establish the core logic of “choosing according to need.” The aim is to find a precise nutritional program matching crop type, growth stage, and production goals, thereby achieving simultaneous improvements in yield and quality.

II. Scientific Core: Nitrogen–Calcium Synergy — The “Dual Guarantee” of Crop Quality and Yield

To understand why calcium ammonium nitrate (CAN), which also called Calcium Nitrate Granular (CNG) can resolve the dilemma of “nitrogen–calcium imbalance,” it is necessary to begin with its nutritional nature, clarifying the mechanisms of nitrogen and calcium in plants, as well as the scientific logic of their synergistic effects.

(1) The Nutritional Nature of Calcium Ammonium Nitrate

Calcium ammonium nitrate is usually a uniform mixture composed of ammonium nitrate, calcium nitrate, and related components. It generally appears as white or light-yellow uniform granules, with a dry and loose texture and no obvious caking. Its aqueous solution is weakly acidic, with a pH value between 5.5 and 6.5. This characteristic enables it to adapt to acidic and neutral soils and also to perform effectively in slightly alkaline soils, without causing soil structural issues due to pH imbalance.

Its nutritional form has two particularly outstanding advantages:

• Dual nitrogen supply: In CAN, most nitrogen exists in the nitrate form (NO₃⁻). This form does not require microbial conversion in the soil and can be directly absorbed by plant roots, quickly alleviating nitrogen deficiency symptoms and meeting the needs of rapid growth.

  
  

  The remaining nitrogen is in the ammonium form (NH₄⁺), which can be adsorbed and fixed by soil colloids, preventing leaching with water and providing a slow release. This achieves a balance between “quick effect” and “long effect.”

• Highly active calcium source: Calcium in CAN exists as water-soluble calcium ions (Ca²⁺). Unlike traditional calcium fertilizers (such as lime or calcium chloride), it does not require soil acidification or microbial decomposition before uptake. It can enter plant root epidermal cells directly and be transported rapidly to fruits and young leaves with transpiration flow, precisely where growth is most vigorous.

(2) The Limitations of Deficiency and Single-Nutrient Supplementation

Nitrogen and calcium are two essential elements for plant growth and development, each with irreplaceable functions. The drawbacks of supplementing either one alone are the root cause of “nitrogen–calcium imbalance.”

• Nitrogen is the “driving force of growth.” It is a key component of chlorophyll, proteins, and nucleic acids. Chlorophyll drives photosynthesis, proteins form the basis of cell growth and repair, and nucleic acids regulate genetic and metabolic processes.

  
  

  Without sufficient nitrogen, crops become stunted, leaves turn yellow (starting with older leaves), and branching/tillering is reduced. Photosynthetic efficiency drops dramatically, leading to restricted fruit development and yield reduction.

• Calcium is the “guardian of quality.” As a major component of cell walls, it strengthens their hardness and elasticity, allowing tighter cell arrangement. In fruits, adequate calcium effectively prevents cracking, malformation, and blossom-end rot, while extending postharvest shelf life. In leaves and roots, calcium stabilizes cell membranes, reduces vulnerability to pests and diseases, and promotes robust root growth.

  
  

  Calcium deficiency causes young leaves to curl and scorch at the edges, fruits to show spots or depressions, and mature fruits to lack firmness, making them highly perishable.

However, supplying nitrogen or calcium alone often leads to “ineffective supplementation”:

• Applying only nitrogen-rich fertilizers (including high-nitrogen CAN) may stimulate excessive vegetative growth. The resulting nutrient competition between leaves and fruits, coupled with ion competition at root uptake sites, suppresses calcium absorption and transport, aggravating calcium deficiency symptoms.

• Applying only calcium fertilizers, in the absence of nitrate nitrogen’s “active pull,” leaves calcium ions largely immobile. They tend to remain in the soil or roots rather than moving to aboveground parts, especially fruits. Efficiency is low, and calcium may also precipitate with phosphorus or magnesium in the soil, causing further waste.

This characteristic of “synchronous demand but contradictory absorption” means that nitrogen and calcium supplementation must be conducted in synergy, not separately.

(3) The “1+1 > 2” Mechanism of Nitrogen–Calcium Synergy

The core value of calcium ammonium nitrate lies in its ability to provide nitrogen and calcium together. Through their mutual reinforcement, a “1+1 > 2” nutritional effect is achieved. The mechanism works on two levels:

• Nitrate nitrogen paves the way for calcium uptake: Plant roots absorb calcium ions mainly through “active transport.” Nitrate nitrogen activates calcium channel proteins on root cell membranes—these proteins serve as dedicated gateways for calcium absorption.

  
  

  The presence of nitrate nitrogen enhances their activity, significantly improving the root’s ability to capture and transport calcium. In addition, organic acids produced during nitrate nitrogen metabolism lower the pH of cell sap, further improving calcium solubility and mobility, allowing calcium ions to reach fruits, young leaves, and other rapidly growing parts more quickly.

• Calcium safeguards nitrogen utilization: Calcium ions stabilize plant cell membranes, reducing the physiological stress that may be caused by ammonium nitrogen. Excess ammonium can generate free ammonia, which damages root cells, while calcium improves membrane permeability and reduces ammonia toxicity.

  
  

  Moreover, calcium promotes protein synthesis in plants, directing absorbed nitrogen more toward fruit and seed development rather than excessive leaf growth, thereby improving nitrogen-use efficiency.

This synergistic relationship—“nitrate nitrogen promotes calcium uptake, calcium ensures efficient nitrogen use”—is what enables calcium ammonium nitrate to overcome the limitations of traditional fertilization.

The difference between the 27% grade and the 15.5% grade essentially reflects different emphases in nitrogen–calcium synergy: the 27% grade strengthens the “growth drive” with higher nitrogen content, while the 15.5% grade highlights “quality assurance” with higher calcium content. Both are scientifically designed to meet different crop needs.

III. Objective Comparison: Characteristics and Application Scenarios of the 27% Grade and the 15.5% Grade

The core difference between the two types of calcium ammonium nitrate (CAN) lies in the emphasis of the nitrogen–calcium ratio. This difference directly determines their physical properties, nutrient supply logic, and suitable application scenarios. Only by clarifying these distinctions can growers achieve precise “fertilizer selection according to need.”

(1) Key Indicators and Characteristic Differences

From basic attributes to field performance, the differences between the 27% grade and the 15.5% grade can be clearly illustrated by comparing key indicators. These differences stem from the varying proportions of ammonium nitrate and calcium nitrate:

Comparison Dimension	27% Grade CAN	15.5% Grade CAN	Logic Behind the Characteristics
Nutrient Ratio	Total N ≥27%, Ca 5%–8%	Total N ≥15.5%, Ca ≥18.0% (equivalent to CaO ≥26%)	The 27% grade has a higher proportion of ammonium nitrate, emphasizing nitrogen supply; the 15.5% grade has a higher proportion of calcium nitrate, reinforcing nitrogen–calcium balance
Solubility & Physical Properties	Lower proportion of soluble calcium, medium hygroscopicity, prone to caking under hot and humid conditions	Higher proportion of soluble calcium (≥98%), less hygroscopic than ammonium nitrate, relatively stable during storage, but still requires dry conditions	The 15.5% grade contains purer calcium nitrate; the 27% grade, with higher ammonium nitrate, is relatively more hygroscopic
Soil Adaptability	Better suited for neutral to slightly acidic soils	Suitable for acidic, neutral, and slightly alkaline soils	With higher calcium content, the 15.5% grade maintains nutrient availability even in slightly alkaline soils; its mildly acidic formulation has less impact on soil pH
Nutrient Cost Efficiency	Lower unit cost of nitrogen; additional calcium fertilizer required if calcium supplementation is needed	Lower combined nutrient cost (“N + Ca”); no need for additional calcium fertilizer	The 27% grade offers clear cost advantages for single nitrogen supply; the 15.5% grade reduces extra inputs through “N and Ca together,” giving higher overall efficiency

(2) Precise Differentiation in Application Scenarios

The value of the two formulations is ultimately reflected in their application suitability — there is no absolute “better,” only “more appropriate.” Their adaptability is fully aligned with crop nutrient demand patterns and production goals:

1. Advantageous Scenarios for the 27% Grade

The 27% grade’s core value lies in its high-nitrogen quick effect, perfectly suited to situations requiring rapid nitrogen supply with relatively low calcium demand. It performs particularly well in fast-growing crops and at the seedling stage:

• Fast-growing leafy vegetables: Spinach, lettuce, bok choy, and other leafy greens have growth cycles of only 20–30 days. The core harvest goal is tender, lush leaves, with urgent and concentrated nitrogen demand but much lower calcium demand compared with fruit and vegetable crops.

  
  

  The high nitrate nitrogen content in the 27% grade rapidly promotes leaf cell division and chlorophyll synthesis, enabling leafy greens to reach marketable standards quickly. Its lower unit nitrogen cost matches the “low-margin, fast-turnover” characteristics of leafy vegetable production.

• Topdressing for cereal crop seedlings: For corn, rice, and wheat, the seedling stage (corn at 3–5 leaf stage, rice during tillering) is critical for “strong seedlings.” Ample nitrogen is required to promote root development and tillering, while calcium demand is concentrated in later stages for lodging resistance and grain filling.

  
  

  The 27% grade serves as an effective seedling-stage topdressing, quickly correcting soil nitrogen deficiency and laying a solid foundation for later growth.

• Emergency fertilization in nitrogen-deficient soils: In fields long cropped with nitrogen-demanding vegetables (such as tomatoes or cucumbers under continuous cultivation) or in poor soils with low nitrogen reserves, crops may show visible nitrogen deficiency symptoms (leaf yellowing, growth stagnation).

  
  

  Applying the 27% grade rapidly restores nitrogen levels, revives crop vigor, and allows calcium supplementation later as needed — making it an efficient “emergency nutrient supply” option.

2. Advantageous Scenarios for the 15.5% Grade

The 15.5% grade’s core value lies in its nitrogen–calcium balance, precisely suited to cultivation goals of “balancing yield and quality.” It shows irreplaceable advantages in fruits and vegetables, especially during critical reproductive stages:

• Nutrient supply during fruit enlargement in vegetables: Tomatoes, strawberries, cucumbers, and other vegetables face the dual demands of yield formation and quality development during fruit enlargement — nitrogen is needed for cell expansion, while calcium prevents cracking, blossom-end rot, and other physiological disorders. With its high calcium content, the 15.5% grade significantly reduces blossom-end rot in tomatoes, lowers cracking rates in strawberries, and extends postharvest shelf life.

  
  

  For example, applying the 15.5% grade during tomato fruit enlargement increases fruit firmness and prolongs storage and transport viability.

• Management of critical growth stages in fruit trees: Grapes, blueberries, citrus, and mangoes experience dual nitrogen and calcium demand peaks between flowering and fruit enlargement. The 15.5% grade meets both needs simultaneously: in grapes, it reduces cracking and uneven berry size; in blueberries, it lowers the occurrence of hollow fruits and enhances sweetness; in citrus, it prevents bitter pit and improves rind smoothness. Its long-lasting effect also reduces the frequency of topdressing, meeting fruit trees’ need for “sustained nutrition.”

• High-quality, large-scale production: With the global fruit and vegetable market increasingly focused on “premium quality at premium prices,” growers demand better fruit appearance, firmness, flavor, and storability. The 15.5% grade’s “N and Ca together” feature perfectly fits this trend — eliminating the need for extra calcium fertilizers, simplifying fertilization, and reducing labor and procurement costs for large-scale operations. Its stable physical properties and high solubility make it ideal for modern irrigation systems (drip and sprinkler), with very low clogging risk, aligning with the “efficient and precise” management requirements of scale production.

• Versatility across soil types: In complex soil environments such as acidic or slightly alkaline soils, the 15.5% grade shows strong adaptability. In acidic soils, its mildly acidic formulation does not worsen soil acidification. In slightly alkaline soils, its high calcium content helps neutralize part of the alkalinity, improve soil aggregation, and avoid precipitation issues between calcium and soil phosphorus, ensuring nutrient availability. This versatility allows it to adapt to diverse regional conditions, reducing the limitations of “soil-based fertilizer selection.”

IV. Practical Value of the 15.5% Grade: From Cultivation Needs to Comprehensive Benefits

The value of the 15.5% grade calcium ammonium nitrate (CAN) does not simply come from the numerical difference in the “nitrogen–calcium ratio.” Its real significance lies in its practical attributes: precisely matching crop needs, optimizing management processes, and enhancing overall returns in real cultivation scenarios. This value aligns with global agricultural trends and has been verified by practical applications in multiple regions.

(1) Precision Fit with the Global Trend of High-Quality Cultivation

As competition in the global agricultural market intensifies, “premium quality at premium price” has become growers’ core pursuit. The characteristics of the 15.5% grade perfectly match this trend:

• Quality enhancement: Its high-calcium feature directly targets the essential requirement of high-quality fruits and vegetables. Adequate water-soluble calcium strengthens fruit cell wall structure, reducing cracking and malformation caused by water fluctuations or physical stress, while improving fruit firmness and skin smoothness.

  
  

  For high-value crops requiring long-distance transport (such as grapes, mangoes, and blueberries), calcium slows postharvest respiration and senescence, extending shelf life. This reduces transport losses and allows growers to access more distant markets. Meanwhile, balanced nitrogen supply ensures normal fruit expansion and nutrient accumulation, preventing problems such as small fruit size and poor taste caused by nitrogen deficiency. Thus, “yield” and “quality” reinforce each other positively.

• Management efficiency: The “N and Ca together” feature greatly simplifies fertilization. Traditionally, growers needed to purchase nitrogen and calcium fertilizers separately and adjust the ratio and timing according to growth stages, which increased procurement and storage costs and risked mismatched results.

  
  

  The 15.5% grade integrates these two core nutrients into a single product, eliminating the need for additional fertilizers. This is particularly suitable for large-scale production with high management efficiency requirements — whether manual fertilization or automated irrigation, nitrogen and calcium supplementation can be completed in a single operation, saving time and labor.

• Soil sustainability: With its mildly acidic formulation and highly active calcium source, the 15.5% grade is friendly to soil health. In slightly alkaline soils, calcium ions help neutralize part of the alkalinity and improve soil pH. In acidic soils, its gentle acidity does not aggravate acidification.

  
  

  In addition, calcium acts as a “binding agent” in soil aggregate structure, promoting particle aggregation, improving water and nutrient retention, and reducing leaching losses — laying a strong foundation for long-term cultivation.

(2) Application Guide: Efficient Use of the 15.5% Grade

The effectiveness of the 15.5% grade depends on precise alignment with crop growth stages and application methods. Based on the needs of major economic crops, the following field-tested practices are recommended:

1. Precise Application by Crop Type

• Grapes: The key stage is post-flowering and fruit enlargement, when fruits undergo rapid expansion and cell wall formation. Recommended method: drip irrigation as the main approach, supplemented with foliar spraying. Core benefits: reduce fruit cracking and uneven berry size, increase sugar content, and improve storability.

• Blueberries: The key stage is from fruit set to color change, requiring nitrogen for fruit enlargement and calcium for firmness. Recommended method: base application combined with foliar spraying. Core benefits: reduce hollow fruits, improve fruit firmness and sweetness, and extend shelf life.

• Tomatoes: Key stages are seedling and fruit enlargement. Seedlings require nitrogen for vigorous growth, while fruit enlargement requires calcium to prevent blossom-end rot. Recommended method: fertigation during seedling stage to promote root and leaf development; during fruit enlargement, apply calcium to prevent rot and cracking, promote uniform fruit expansion, and improve fruit weight and storability.

• Citrus: Key stages are spring shoot growth and fruit enlargement. Nitrogen is needed in spring to promote new shoot development, while calcium is required during fruit enlargement to prevent bitter pit. Recommended method: base application before spring shoot flush to support new growth and fruit set; drip irrigation during fruit enlargement for nitrogen–calcium supplementation. Core benefits: reduce bitter pit and malformed fruit, improve rind smoothness, and enhance overall fruit quality.

2. Key Application Notes

• Avoid mixing with alkaline fertilizers: The 15.5% grade is weakly acidic. If mixed with alkaline fertilizers (such as plant ash, ammonium bicarbonate, or hydrated lime), nitrogen volatilization (as ammonia gas) may occur, and calcium ions may precipitate and become unavailable. It is recommended to apply separately with an interval of 7–10 days.

• Timing of foliar spraying: Avoid high-temperature, strong-light periods. Spray when stomata are open for higher absorption efficiency, and to prevent rapid evaporation that may cause leaf burn. Apply on both sides of leaves, with special attention to the underside where stomatal density is higher.

• Storage and handling after opening: Store in a well-ventilated, dry, and cool warehouse, away from rain and direct sunlight, to prevent moisture absorption and caking that could affect performance.

V. Clarifying Misconceptions: The Core Logic of Scientifically Choosing Calcium Ammonium Nitrate

When selecting calcium ammonium nitrate (CAN), growers often fall into decision-making dilemmas due to misconceptions about nutrient needs and product characteristics. Clearing up these common misunderstandings and establishing the core logic of “matching demand” is essential for realizing the true value of the fertilizer.

(1) Breaking Away from the Misconception of “Single-Index Evaluation”

1. Misconception 1: “The higher the total nitrogen content, the better the fertilizer effect.”

   
   

   Many growers assume that “nitrogen content = fertilizer efficiency.” In reality, crop nitrogen demand is not “the more the better,” but rather has a “demand threshold.” For fast-growing leafy vegetables such as spinach and lettuce, short-term nitrogen supplementation indeed promotes leaf growth, making high-nitrogen fertilizers suitable.

   
   

   However, for fruit and vegetable crops such as tomatoes and grapes, excessive nitrogen after the fruit enlargement stage can cause excessive vegetative growth, nutrient competition with fruits, smaller fruit size, delayed ripening, inhibited calcium uptake, and more fruit cracking. The “effectiveness” of a fertilizer essentially depends on the match between nutrients and crop demand, not on a single indicator. For crops where both yield and quality matter, a balanced nitrogen–calcium ratio is far more important than simply high nitrogen.

   
   

2. Misconception 2: “The two grades can be freely substituted; the only difference is nitrogen content.”

   
   

   The difference between the 27% and 15.5% grades goes beyond nitrogen content. It reflects different nutrient supply logics, making them “scenario-specific” products. Using the 27% grade instead of the 15.5% grade during mango fruit enlargement may lead to increased malformed fruits due to insufficient calcium.

   
   

   Conversely, applying the 15.5% grade instead of the 27% grade during lettuce seedling stages may technically meet growth needs, but the high calcium level would be considered “excessive nutrition,” mismatched with leafy vegetables’ core need for efficient nitrogen supply. Random substitution not only fails to achieve desired results but may also cause nutrient waste or deficiencies, violating the principle of precision fertilization.

   
   

3. Misconception 3: “Separately applying nitrogen and calcium is more flexible than applying both together.”

   
   

   Some growers believe that “separate applications allow more control.” However, they overlook the synergy in nitrogen and calcium absorption.

   
   

   When applying nitrogen alone, excess nitrogen competes with calcium ions at root uptake sites, hindering calcium absorption.

   
   

   When applying calcium alone, without nitrate nitrogen’s “active pull,” calcium ions struggle to move from roots to fruits, remaining mostly in soil or roots, leading to low efficiency.

   
   

The core value of nitrogen–calcium co-application lies in its “1+1 > 2” synergistic effect: nitrate nitrogen activates calcium uptake channels, while calcium ensures precise nitrogen allocation. This natural complementarity cannot be replaced by separate applications.

(2) Core Principles of Selection: Matching “Crop Needs” and “Cultivation Goals”

There is no “standard answer” to choosing CAN. The only rule is: “What the crop needs, choose accordingly.” This can be judged from two dimensions:

1. Match by crop type and growth stage

   
   

   Different crops have different nutrient demand patterns, and these vary by growth stage:

   
   

   For fast-growing leafy vegetables (spinach, lettuce) or cereals at seedling stages (corn, rice tillering), the core demand is “rapid short-term nitrogen supplementation,” with relatively low calcium demand. The high-nitrogen, quick-effect feature of the 27% grade precisely fits this need, ensuring vigorous leaf growth or strong seedlings.

   
   

   For fruiting vegetables (tomatoes, strawberries) or fruit trees (grapes, citrus, mangoes) in critical stages such as fruit set or enlargement, the core demand is “nitrogen for growth, calcium for quality.” The nitrogen–calcium balance of the 15.5% grade meets both needs simultaneously, avoiding quality issues caused by nutrient deficiencies.

   
   

2. Match by cultivation goals

   
   

   Cultivation goals directly determine the emphasis of nutrient supply:

   
   

   If the goal is “short-term high yield, rapid market entry” (e.g., multi-crop greenhouse leafy vegetables), the 27% grade provides high nitrogen supply to achieve “short cycle, high yield,” fitting the “low-margin, fast-turnover” logic.

   
   

   If the goal is “premium quality and higher returns” (e.g., export-grade vegetables or high-value orchards), the high-calcium feature of the 15.5% grade reduces fruit cracking and malformation, extends shelf life, and captures price premiums. At the same time, it simplifies fertilization management, making it well-suited for large-scale, quality-focused production.

   
   

In short, the key to choosing calcium ammonium nitrate is not about “which grade has higher content,” but about “what the crop requires and what the grower’s goal is.” Each grade has its appropriate scenarios; there is no “absolute advantage,” only “relative suitability.”

VI. Conclusion: The Path of Nitrogen–Calcium Synergy

The reason calcium ammonium nitrate (CAN) has become the preferred solution for growers worldwide to overcome “nitrogen–calcium imbalance” lies in its natural advantage of simultaneous nitrogen and calcium supplementation. It breaks through the traditional dilemma of “ineffective single supplementation, difficult co-supplementation,” creating a positive linkage between nitrogen as the “growth driver” and calcium as the “quality safeguard.”

The coexistence of the 27% grade and the 15.5% grade is not a matter of “technological superiority or inferiority,” but rather an inevitable outcome of differentiated agricultural production needs.

Essentially, the choice between the two grades of CAN is a precise response to crop requirements and cultivation objectives:

• For those pursuing short-term high yields and rapid crop turnover, the 27% grade is the efficient choice.

• For those striving for premium quality and simplified management, the 15.5% grade is the suitable option.

There is no absolute “optimal solution,” only the “most appropriate” answer.

For global growers increasingly focused on “quality premiums” and “management efficiency,” the value of the 15.5% grade CAN has already surpassed the mere numbers of the nitrogen–calcium ratio. It stands as a bridge linking stable yield with quality improvement — a scientific choice aligned with agricultural development trends and a practical solution for enhancing farming returns through precise nutrition.

KELEWELL – Providing High Quality 15.5% Calcium Ammonium Nitrate and Service Support

As outlined above, the value of the 15.5% grade calcium ammonium nitrate (CAN) in high-quality cultivation lies in its suitability for both yield and quality. The key to unlocking this value, however, is stable product quality and reliable service support. Kelewell is committed to providing global growers with solutions that embody precise nutrition, consistent quality, and attentive service. Our 15.5% grade CAN is a representative product built on this philosophy.

(1) Our Product: A Quality Choice Precisely Matching Needs

Our 15.5% grade CAN fully aligns with the “nitrogen–calcium balance” advantage emphasized above. From raw materials to finished products, we maintain strict quality control to ensure that every batch delivers consistent performance:

1. Core indicators guaranteed: Strictly meeting the standard of “Total N ≥15.5%, Ca ≥18.0% (as Ca, equivalent to CaO ≥26%),” achieving true nitrogen–calcium balance, suitable for fruits, vegetables, and orchards requiring both quality and yield.

   
   

2. Optimized physical properties: Uniform granules with good flowability, treated with anti-caking measures. Stable under standard storage conditions, with low loss during cross-border transport, suitable for diverse global storage and application environments.

   
   

(2) Our Services: Full-Process Support

We understand that high-quality fertilizers require professional guidance to maximize value. Therefore, we provide our customers with product + technology + service full-chain support:

1. Customized solutions: Packaging customization and tailored application programs based on your specific needs.

   
   

2. Technical support: Complete product specifications and technical sheets are provided with every shipment.

   
   

3. Reliable supply chain assurance: Stable delivery aligned with your order cycle to avoid supply interruptions, along with full customs clearance documentation to simplify cross-border procurement.

   
   

(3) How to Connect with Us

If you are looking for 15.5% grade CAN tailored to high-quality cultivation, please contact us:

• Official email: info@kelewell.de

  
  

At Kelewell, we firmly believe that premium fertilizers are the foundation of yield and quality, and professional service is the guarantee of real value. We look forward to supporting your path toward high-quality cultivation with the dual strengths of precise nutrition + attentive service.