Urea fertilizer is the most widely used nitrogen source in agriculture, prized for its high nitrogen content (46%) and cost-effectiveness. Farmers often ask whether urea fertilizer can be mixed with other fertilizers to save time, reduce labor costs, and provide balanced nutrition in a single application. The short answer is: yes, urea fertilizer can be mixed with several fertilizers, but compatibility depends on the type of fertilizer, the chemical reactions involved, and storage practices.
In this guide, we’ll explain which fertilizers are compatible with urea, the chemistry of mixing, safety guidelines, and field-proven results. Along the way, we’ll introduce YaraFert solutions such as SULFOMIX, Biofast, Ugarit formulations, and CALCIMAG, which are designed to work harmoniously with urea fertilizer for maximum efficiency.
Common Fertilizers Compatible with Urea Fertilizer
Not all fertilizers can be blended with urea fertilizer. Some combinations enhance efficiency, while others may cause caking, nutrient losses, or chemical instability.
Here are fertilizers commonly compatible with urea:
- Phosphate fertilizers: Urea can be safely mixed with Ugarit 0-52-34 (phosphorus 52%, potassium 34%) and Super DKP (P?O? 30%, K?O 60%), provided the mixture is applied soon after blending.
- Potassium fertilizers: Urea combines well with Ugarit 0-5-65 and Ugarit Multi (K?O 30%, S 32%, CaO 10%) to support both nitrogen and potassium nutrition.
- Sulfur-based fertilizers: Adding Sulforex 80 + S or SULPHOMIN (N 45%, SO? 15%) enhances nitrogen use efficiency, since sulfur improves protein synthesis.
- Balanced NPK fertilizers: Urea can be used alongside suspensions such as Ugarit 27-27-27 + TE and Biofast (12-12-12 with humic and fulvic acids) to provide comprehensive nutrition.
- Micronutrient mixes: Combining urea with products like SULFOMIX (Zn, Fe, Mn, Cu, B, S) ensures plants don’t suffer hidden deficiencies.
? Tip: While urea fertilizer is versatile, avoid long-term storage of mixed blends unless recommended, as caking and nutrient losses can occur.
Chemical Reactions When Mixing Urea Fertilizer
Understanding the chemistry helps prevent nutrient losses and ineffective blends.
- Urea + Ammonium-based fertilizers: Combining with ammonium nitrate can increase the risk of hygroscopic caking due to moisture absorption.
- Urea + Phosphates: When mixed with superphosphate, urea may form sticky compounds if stored too long. Apply soon after blending.
- Urea + Sulfur fertilizers: Sulfur reduces nitrogen volatilization by improving soil acidity around the root zone, making combinations with Ugarit K-T-S 70 (K?O 36%, SO? 70%) highly beneficial.
- Urea hydrolysis: When urea breaks down in soil (CO(NH?)? ? NH? + CO?), it can temporarily raise pH. Adding calcium-rich fertilizers like CALCIMAG (N 15%, CaO 22%) helps buffer soil pH.
These chemical principles explain why urea fertilizer blends must be carefully chosen depending on soil, crop, and environmental conditions.
READ MORE: Common Mistakes When Using Urea Fertilizer and How to Avoid Them
Guidelines for Blending Urea Fertilizer Safely
To make the most of urea blends, follow these safety and efficiency guidelines:
- Check compatibility tables before blending urea with phosphate, potassium, or micronutrient fertilizers.
- Avoid long-term storage of urea-phosphate or urea-ammonium mixes, as they may form sticky masses.
- Apply freshly mixed blends directly to the field, especially in humid environments.
- Use suspension fertilizers like Ugarit 40-10-10 + TE or Ugarit 25-25-25 + TE, which are designed for compatibility with nitrogen sources.
- Monitor soil pH and supplement with calcium or magnesium sources (e.g., CALCIMAG) to prevent acidification from urea hydrolysis.
By following these practices, farmers can optimize nutrient efficiency while minimizing fertilizer waste.
Urea Fertilizer Mixing and Storage Practices
Correct handling of urea fertilizer mixtures is as important as knowing what to mix.
- Moisture sensitivity: Urea absorbs moisture quickly, leading to caking. Always store blends in cool, dry, and well-ventilated areas.
- Temperature effects: High temperatures accelerate ammonia volatilization. Mixing with stabilizers or sulfur-rich fertilizers such as Sulforex 60 + Cu reduces losses.
- Granular vs. liquid compatibility: While granular urea can be physically blended, liquid formulations like Ugarit DKP (P?O? 33%, K?O 44%) require precision mixing in solution tanks.
- Short-term storage only: Avoid holding urea mixtures longer than a few weeks unless additives (anti-caking agents) are included.
Complementary products like Biofast (gel form with humic and fulvic acids) improve the physical stability of blends while enhancing nitrogen uptake.
READ MORE: Best Time to Apply Urea Fertilizer Based on Crop Type
Field Results of Mixed Urea Fertilizer Applications
Real-world trials confirm that carefully blended urea fertilizer enhances both yield and nutrient efficiency.
- Cereal crops (Wheat, Maize, Rice):
Farmers achieved 10–15% higher grain yield when urea was combined with Ugarit Cereal (N 15%, Cu 2%), compared to urea alone. - Vegetables:
Blending urea with Ugarit 10-10-40 + TE improved fruit setting, while adding SULFOMIX reduced micronutrient deficiencies. - Sugarcane:
Trials showed better nitrogen use efficiency when urea was combined with Ugarit K-T-S 25 (K?O 36%, SO? 25%), leading to higher sucrose content. - Fruits (Grapes, Strawberries):
Farmers reported improved color, size, and shelf life by integrating urea with Ugarit Grapes (Cu, Mg, Mn, Zn) or Ugarit Strawberry (P?O? 20%, K?O 25%).
These results highlight that urea fertilizer works best when integrated with balanced formulations, ensuring crops receive complete nutrition.
Final Thoughts
Yes, urea fertilizer can be mixed with other fertilizers, but doing so requires an understanding of compatibility, chemical interactions, and proper storage practices. The best results are achieved when urea is paired with fertilizers that complement its nitrogen supply, such as phosphorus, potassium, sulfur, and micronutrient-rich solutions.
By incorporating advanced products like SULFOMIX, Biofast, Ugarit formulations, CALCIMAG, and Sulforex, farmers can maximize the efficiency of urea fertilizer, reduce nutrient losses, and achieve higher crop yields with better quality.
? Ready to optimize your fertilizer program? Explore our range of YaraFert solutions today or contact our team for customized recommendations tailored to your soil and crop needs.
READ MORE: Slow-Release Urea Fertilizer vs. Conventional Urea Fertilizer: What’s the Difference?