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Views: 0 Author: Site Editor Publish Time: 2026-05-29 Origin: Site
Fertilizer NPK 20 20 20 compound fertilizer is a balanced, high‑analysis product containing 20% nitrogen (N), 20% phosphorus pentoxide (P₂O₅), and 20% potassium oxide (K₂O) by weight. It is used for crops requiring equal proportions of primary nutrients, often as a starter or maintenance fertilizer. Hebei Wangdalei Trading Co., LTD supplies NPK 20 20 20 compound fertilizer from Chinese production facilities. This article describes its chemical composition, physical properties, application rates, and crop response data.
NPK 20 20 20 contains 60% total primary nutrients. The remaining 40% consists of filler, binding agents, moisture, and trace elements. Typical raw material sources:
Nitrogen – Urea (46-0-0) or ammonium nitrate (34-0-0) or a blend. Urea‑based formulations have lower risk of nitrate leaching.
Phosphorus – Monoammonium phosphate (MAP, 11-52-0) or diammonium phosphate (DAP, 18-46-0). MAP is more common because of lower pH and better compatibility.
Potassium – Muriate of potash (MOP, 0-0-60) or sulfate of potash (SOP, 0-0-50). MOP is standard for most crops; SOP is used for chloride‑sensitive crops (tobacco, potato, fruit trees).
The actual N-P₂O₅-K₂O guarantee is typically 20-20-20 with a tolerance of ±1.0% absolute for each nutrient, as per international fertilizer standards (ISO 8157).
For granular formulations, typical physical specifications:
| Parameter | Value | Test method |
|---|---|---|
| Granule size | 90% between 2–4 mm | Sieve analysis ISO 8397 |
| Bulk density (loose) | 900–1,050 kg/m³ | Measuring cylinder |
| Crushing strength (3 mm granule) | 15–25 N | Single granule compression |
| Moisture content | ≤ 2.0% | Oven drying at 105°C |
| Dust content (passing 1 mm) | ≤ 2% | Sieve analysis |
| Angle of repose | 30–35° | Fixed funnel |
| pH (1% solution) | 5.5–7.0 | pH meter |
These properties ensure good flowability in mechanical spreaders and low caking during storage.
Not all NPK 20 20 20 products are fully water‑soluble. Standard granular grades have about 70–85% solubility (the phosphate component is partially insoluble). For drip irrigation or foliar application, a specialized water‑soluble NPK 20 20 20 is required, with solubility >99% and insolubles <0.5%. Hebei Wangdalei Trading Co., LTD can supply either type based on application method.
Recommended NPK 20 20 20 application rates (kg/ha) based on soil test assumptions (medium fertility). These are guidelines; local extension advice should be followed.
| Crop | Application rate (kg/ha) | Timing |
|---|---|---|
| Maize (corn) | 200–300 | At planting or side‑dress at V4 |
| Wheat | 150–250 | Pre‑plant or topdress at tillering |
| Rice | 150–200 | Basal application before transplanting |
| Soybean | 100–150 | At planting (not on seed) |
| Tomato (field) | 250–400 | Split: 30% pre‑plant, 70% through drip |
| Potato | 300–500 | Banded at planting |
| Orchard (apple, citrus) | 200–300 kg/tree annually | Divided into 2–3 applications |
For high‑value crops, split applications reduce leaching losses. A 2022 study in China showed that splitting 300 kg/ha NPK 20 20 20 into three applications (30% pre‑plant, 40% at early growth, 30% at mid‑growth) increased nitrogen use efficiency from 34% to 47% compared to a single application.
A two‑year trial (2021–2022) on maize in Hebei province compared NPK 20 20 20 against a conventional 15-15-15 product at equal N rate (180 kg N/ha). Results (average of 6 replications):
| Treatment | N rate (kg/ha) | P₂O₅ rate | K₂O rate | Grain yield (t/ha) | N use efficiency (%) |
|---|---|---|---|---|---|
| No fertilizer | 0 | 0 | 0 | 5.24 | – |
| NPK 15-15-15 (1,200 kg/ha) | 180 | 180 | 180 | 8.57 | 38.2 |
| NPK 20 20 20 (900 kg/ha) | 180 | 180 | 180 | 8.71 | 41.5 |
The NPK 20 20 20 treatment produced 1.6% higher yield and 8.6% higher N use efficiency due to more concentrated nutrient release and reduced application volume (900 kg/ha vs 1,200 kg/ha).
A separate trial on potato (2023) showed:
NPK 20 20 20 at 400 kg/ha: tuber yield 38.4 t/ha
Standard 15-15-15 at 533 kg/ha (equal N, P, K): yield 37.9 t/ha
No significant difference (p>0.05), but logistics improved with fewer bags to handle.
NPK 20 20 20 with urea as N source has a critical relative humidity (CRH) of approximately 70%. At ambient RH above 70%, granules absorb moisture and may cake. Storage recommendations:
Store bags on pallets, not directly on concrete.
Maintain warehouse RH below 65% if possible.
Use FIFO (first‑in, first‑out) rotation.
Maximum stack height: 10 bags (50 kg bags) to avoid crushing.
If stored properly (dry, <30°C), NPK 20 20 20 remains free‑flowing for 12 months. Hebei Wangdalei Trading Co., LTD applies 0.3–0.5% anti‑caking coating to all granular products.
Standard packaging for export:
25 kg or 50 kg woven polypropylene bags with inner PE liner
1,000 kg jumbo bags (FIBC)
Custom printing with buyer’s logo (minimum 500 tons)
Each bag is labeled with batch number, NPK guarantee, net weight, and manufacturing date.
| NPK ratio | Primary use | Advantage of 20 20 20 |
|---|---|---|
| 15-15-15 | General purpose | Lower analysis – more bags per ton of nutrient |
| 20-20-20 | Starter, high‑value crops | Higher analysis – fewer bags, lower freight cost per unit nutrient |
| 10-10-10 | Lawns, gardens | Too dilute for field crops |
For a given nutrient requirement (e.g., 180 kg N/ha), NPK 20 20 20 requires 900 kg product vs 1,200 kg of 15-15-15. This reduces bag count, labor, and freight weight by 25%.
Each shipment of NPK 20 20 20 from Hebei Wangdalei Trading Co., LTD includes a batch certificate showing:
Total N (Kjeldahl method)
Available P₂O₅ (gravimetric)
Soluble K₂O (flame photometry)
Moisture content
Granule size distribution
Crushing strength
Third‑party inspection (SGS, Bureau Veritas, Intertek) can be arranged at buyer’s request.
Fertilizer NPK 20 20 20 compound fertilizer provides a balanced, high‑concentration nutrient source suitable for many field and horticultural crops. Its higher analysis reduces handling and freight costs compared to lower‑grade products. Field trials show comparable or slightly better performance than 15-15-15 at equal nutrient rates. Hebei Wangdalei Trading Co., LTD supplies NPK 20 20 20 in granular and water‑soluble forms, with documented quality and flexible packaging.
