NPK compound fertilizer is a type of chemical fertilizer that contains three essential nutrients: nitrogen (N), phosphorus (P), and potassium (K). NPK compound fertilizers provide crops with all three primary nutrients, supporting various stages of plant development—from leaf growth and flowering/fruiting to the development of roots and tubers—based on the specific needs of the crop at each growth phase.
Functions of NPK Compound Fertilizer:
Nitrogen, phosphorus, and potassium are the “three primary elements” for plant growth, each serving a distinct function:
1. Nitrogen (for leaf growth): Promotes the development of roots, stems, and leaves, accelerating plant growth and fostering lush foliage. Leafy vegetables have the highest demand for nitrogen; a deficiency during the seedling stage can result in stunted, weak plants with yellowing leaves.
2. Phosphorus (for flowering and fruiting): Stimulates root initiation, flower bud differentiation, and the processes of flowering and fruiting—often referred to as “flower fertilizer.” Demand peaks before the flowering stage; a phosphorus deficiency can hinder flower bud formation and fruit set.
3. Potassium (for strengthening fruits and roots): Enhances photosynthetic efficiency and facilitates the transport of nutrients to fruits and roots. It improves a plant’s resistance to diseases, cold, and lodging (falling over), while also aiding in fruit coloration and increasing sugar content. Crops such as melons, fruits, legumes, and root/tuber vegetables have a high demand for potassium.
Classification of NPK Compound Fertilizers:
NPK compound fertilizers can be categorized based on nutrient composition, production processes, and application scenarios. The defining characteristic is that they contain all three nutrients—nitrogen, phosphorus, and potassium—which is why they are referred to as “ternary” (three-component) compound fertilizers.
Based on nutrient composition, NPK Compound Fertilizers can be classified as follows:
1. Binary compound fertilizers: These contain only two of the three primary nutrients (N, P, and K). Examples include monoammonium phosphate and diammonium phosphate (N-P type), potassium nitrate (N-K type), and potassium dihydrogen phosphate (P-K type). These are not considered “ternary” NPK compound fertilizers in the strict sense.
2. Ternary compound fertilizers: Contain nitrogen (N), phosphorus (P), and potassium (K). Examples include general-purpose types (e.g., 15-15-15), high-nitrogen types (e.g., 30-10-10), high-phosphorus types (e.g., 10-25-10), and high-potassium types (e.g., 15-10-10-20).
3. Multi-element compound fertilizers: Based on N, P, and K, these include additional secondary nutrients (such as calcium, magnesium, or sulfur) or micronutrients (such as zinc, boron, or molybdenum)—for example, 15-10-15+Zn+B.
Based on production processes, NPK compound fertilizers can be categorized as follows:
1. Chemically synthesized compound fertilizers: Produced through chemical synthesis, ensuring uniform nutrient distribution (e.g., nitrophosphate fertilizers).
2. Blended fertilizers (BB fertilizers): Created by physically mixing different granular fertilizers; the process is simple and the cost is relatively low.
3. Slow-release/controlled-release fertilizers: Coated with substances like sulfur or polymers, these fertilizers release nutrients over a period of 30–120 days, providing long-lasting effects.
4. Water-soluble fertilizers: Completely soluble in water with no residue; suitable for drip or sprinkler irrigation (e.g., 18-18-18+TE).
5. Organic-inorganic compound fertilizers: Contain added organic matter, such as humic acid or amino acids, which helps alleviate soil compaction.
Based on application scenarios, NPK compound fertilizers can be categorized as follows:
1. General-purpose types: Feature a balanced nutrient ratio (e.g., 15-15-15) and are suitable for most field crops, though they lack specific targeting.
2. Crop-specific types: Tailored to the specific nutrient requirements of individual crops—such as fertilizers for rice (16-8-16+Si) or tobacco (10-15-20+S)—offering 15%–20% higher nutrient utilization efficiency compared to general-purpose types.
Additionally, fertilizers can be categorized by their total nutrient content into three grades: high-concentration (≥40%), medium-concentration (≥30%), and low-concentration (≥25%).
Application of NPK Compound Fertilizers:
Different crops have varying requirements for nitrogen (N), phosphorus (P), and potassium (K) at different growth stages. Selecting the right fertilizer formula is essential for increasing yields and improving quality:
1. Leafy vegetables (e.g., Chinese cabbage, spinach): Choose a high-nitrogen formula.
Recommended formulas: 18-8-10 or 20-5-5.
Apply 10–15 kg per mu during the seedling stage, and 15–20 kg per mu as a top dressing during the growth period.
2. Fruit-bearing vegetables (e.g., tomatoes, cucumbers): Choose a high-potassium formula during the flowering and fruiting stages.
Recommended formulas: 15-10-20 (flowering and fruit-setting stage) and 10-5-25 (fruit-expansion stage).
Apply 20–35 kg per mu to reduce the incidence of deformed fruit and increase the proportion of marketable produce.
3. Root and tuber crops (e.g., potatoes, sweet potatoes): Choose a high-potassium formula.
Recommended formula: 18-5-22.
Apply 25–30 kg per mu during the “large trumpet” (rapid vegetative growth/pre-tuberization) stage, supplemented with a foliar spray of zinc sulfate.
4. Field crops (rice, wheat, corn): Use general-purpose or crop-specific formulas.
Rice: 16-8-16 as a basal fertilizer (40–50 kg/mu); 20-0-10 as a top dressing during the tillering stage (15–20 kg/mu).
Wheat: 15-15-15 as a basal fertilizer (35–45 kg/mu); 30-10-10 as a top dressing during the green-up stage (20–25 kg/mu).
Corn: Apply 18-5-22 (25–30 kg/mu) during the “large trumpet” stage.
5. Cash crops (e.g., cotton, rapeseed): Require supplementation with secondary and micronutrients.
Cotton: 12-15-18 (20–25 kg/mu) during the budding stage; 10-8-22 (30–35 kg/mu) during the flowering and boll-development stage. Rapeseed: Apply 15-10-15 + boron (30–35 kg/mu) as a basal fertilizer, and top-dress with 10-5-20 (15–20 kg/mu) during the bolting stage.
PRODUCT DETAILS
| NPK Nitrogen Phosphorus Potassium Specification | |||||
| Product Name | NP Fertilizer | PK Fertilizer | NK Fertilizer | NPK Fertilizer | Organic Fertilizer |
| Formula | 10-10-0 20-20-0 16-20-0 23-21-0+4S |
0-5-35 0-10-20 0-18-18 0-20-20 0-23-29 0-23-20 |
15-0-10 19-0-19 18-0-27 20-0-20 20-0-30 |
10-10-20 10-20-20 11-22-16 12-24-12 13-13-21 13-13-20 15-15-15 17-17-17 18-10-10 20-10-10 12-12-17+2MgO 18-18-5+1.5MgO |
5-5-5 +Organic matter 8-8-8 +Organic matter 12-1-4 +10% Organic matter 10-0-8 +10% Organic matter |
| Size | Granualr 2-4mm | ||||
| We Also Can Do Special Formula As Your Request. | |||||
PRODUCT ADVANTAGES
SCOPE OF APPLICATION
OUR FACTORY
PACKING & DELIVERY
Shipping By Sea
1. Standard packaging, Woven bag 25kg, Ton bag
2. Packaging according to customer requirements
FAQ
1. Are you a manufacturer or a trading company?
We are manufacturer, we have our own factory in Shanxi and Gansu.
2. Can you provide samples?
Yes, we can provide samples and we can send them to you immediately after receiving your request.
3.What is the MOQ?
Our usual MOQ is one full container, if you want to try LCL, we can also support it.
4. Can you print our logo?
Yes, of course!
5. How many different packages are available?
40kg/50kg white bag; 25kg customized colorful bag; other packages as per customer’s request.
6. How does your factory control quality?
Quality is our top priority. Our QC always puts a high priority on quality control from the beginning to the end of production. Every shipment must be tested by HPLC before shipment and pre-shipment inspection by SGS or PONY to ensure the products are qualified.
