What Is Urea Fertilizer? Uses, Benefits, and Risks

When a farmer stands in front of a fertilizer shelf, one name comes up in every season: urea. This fertilizer carries decades of agricultural success behind it is the most widely used nitrogen fertilizer in the world, containing the highest nitrogen concentration of any solid fertilizer. But the questions that follow are always the same: what does urea actually do for plants? Is it suitable for all crops? And what are the safe application rates that won’t damage your plants?

At Al-Qawafel, we see many farmers using urea incorrectly adding large quantities under the assumption that more nitrogen means better growth, only to find their plants wilting or suffering from fertilizer burn. This comprehensive guide explains everything you need to know about urea fertilizer: its chemical composition, its types, its benefits and risks, and practical, science-backed application tips drawn from 30 years of experience across 40 countries.

What Is Urea Fertilizer?

Urea fertilizer is one of the most well-known and widely used nitrogen fertilizers in the world, known chemically as carbamide. Its defining characteristic is its concentrated nitrogen content   46% nitrogen, the highest of any solid nitrogen fertilizer commercially available.

Chemical Composition

Urea is an organic compound with the chemical formula CO(NH₂)₂. It is manufactured industrially through the reaction of carbon dioxide with anhydrous ammonia at a pressure temperature of approximately 176.5°C. Its key physical properties are:

• A solid, colorless, odorless substance
• Highly soluble in water
• Strongly hygroscopic (absorbs moisture from the air)

Source and Production

Urea fertilizer is produced synthetically in industrial facilities, where ammonia and carbon dioxide gases are combined under specific temperature and pressure conditions to form solid granules that are easy to package and transport. It is distinct from the naturally occurring urea found in animal urine   manufactured urea is produced at high concentrations optimized for plant nutrition.

Is “Urea” the Same as “Fertilizer”?

In agricultural contexts, urea means concentrated nitrogen fertilizer. In medical contexts, urea is a natural compound excreted in urine. The key distinction is that agricultural urea is a synthetic industrial product designed specifically for plant nutrition   it is not an organic material, despite what the name might suggest.

Types of Urea Fertilizer on the Market

Urea fertilizer is available in several forms, each with different application methods and effects:

SABIC Urea Types (Saudi Arabia)

Saudi Basic Industries Corporation (SABIC) is one of the largest urea fertilizer producers in the region. Its main urea products include:

SABIC Granular Urea: Large granules, ideal for direct field application in open farmland.

SABIC Prilled Urea: Fine granules, suited for foliar spray and rapid dissolution in irrigation water.

SABIC Coated Urea: Advanced slow-release nitrogen technology for extended feeding over the growing season.

What Urea Does for Plants: Benefits and Effects

The real value of urea fertilizer lies in its direct influence on plant growth and productivity.

Benefits of Urea Fertilizer (46% N)

Highest nitrogen concentration available: At 46% N, urea delivers roughly double the nitrogen per kilogram compared to fertilizers like ammonium sulfate, reducing transport and storage costs significantly.

Stimulates vegetative growth: Increases leaf size, improves canopy density, and deepens the green color of foliage.

Enhances photosynthesis: Nitrogen is a core component of chlorophyll, directly boosting the plant’s capacity to produce carbohydrates from sunlight.

Increases crop yield: Particularly effective for leafy crops and cereals   wheat, corn, and rice all respond strongly to urea applications.

Strengthens root systems: Promotes root development and increases the root system’s capacity to absorb nutrients and water.

Improves fruit quality: Increases fruit size and quality, translating directly into better economic returns for the farmer.

Fast-dissolving: Dissolves quickly in water and is readily absorbed after conversion in the soil.

Al-Qawafel insight: The smart farmer considers soil condition and crop type before applying urea. We never recommend large single applications   split dosing across multiple applications prevents nitrogen loss through volatilization.

Urea for Trees and Date Palms

Trees and date palms benefit significantly from urea, especially during active growth periods. Nitrogen from urea contributes to:

• Vigorous new leaf and branch growth, increasing the tree’s productive biomass
• Improved fruit quality in citrus, date palms, and other fruit trees
• Enhanced disease resistance and tolerance of environmental stress

Al-Qawafel tip: When fertilizing date palms and fruit trees, distribute the total dose across 2–3 split applications during the growing season. Never place the fertilizer directly against the trunk   this causes burn.

Urea for Citrus

Citrus trees require nitrogen in moderate amounts and respond well to urea at the right stages:

• In early tree development: stimulates vegetative growth
• At the flowering stage: supports flower formation and fruit set
• During fruit development: improves fruit size and quality
• Throughout the season: helps reduce premature fruit drop

Application Guide: When and How to Use Urea

Best Timing for Urea Application

At the start of the growing season: before planting or at the onset of plant growth, to supply the nitrogen needed for initial canopy development.

During the vegetative growth phase: when the plant is growing rapidly and building new tissues.

During light rainfall periods: moisture helps dissolve and integrate the fertilizer into the soil.

Just before irrigation: this ensures better nitrogen absorption and reduces volatilization losses.

Using Urea in Summer

Avoid applying urea during peak summer heat. High temperatures accelerate the volatilization of nitrogen as ammonia gas, significantly reducing fertilizer efficiency.

If summer application is unavoidable:

• Apply in the early morning or after sunset
• Reduce the dose compared to cooler seasons
• Irrigate immediately after application to fix nitrogen in the soil
• Use organic mulch (such as straw) to reduce surface evaporation

Application Methods

Soil application (broadcasting and incorporation):

1. Calculate the correct dose based on soil analysis and crop type
2. Distribute granules evenly across the soil surface
3. Incorporate the fertilizer into the top 5–10 cm of soil to minimize volatilization loss
4. Irrigate immediately to dissolve the fertilizer and drive it into the root zone

Foliar spray application:
Foliar urea delivers rapid results and can achieve 70–100% nitrogen use efficiency. For correct application:

1. Use prilled urea with a biuret content below 1%
2. Spray in the early morning or evening
3. Avoid spraying in high heat or direct sunlight
4. Add a surfactant to improve leaf absorption

Recommended Dose per Tree

The following are indicative rates actual doses vary by tree age, species, and soil condition:

Urea vs. DAP: Key Differences

Urea vs. Nitrate Fertilizers: Key Differences

Risks of Incorrect Urea Use

Despite its many benefits, improper urea application causes serious damage:

Plant burn: Large doses or fertilizer placed near roots and leaves causes direct tissue burn.

Soil acidification: Excessive, repeated use lowers soil pH over time, reducing long-term soil fertility, reducing long-term soil fertility and contributing to salt accumulation in the root zone – learn how to treat fertilizer-induced soil salinity. 

Nitrogen volatilization loss: Urea applied to warm soil surfaces without incorporation loses a significant proportion of its nitrogen content as ammonia gas before it can be absorbed.

Air pollution: Ammonia and nitrous oxide emissions from unmanaged urea applications contribute to greenhouse gas accumulation.

Disruption of flowering and fruit set: Urea applied during the flowering period of vegetables and fruit crops can impair pollination and fruit set.

Increased susceptibility to fungal diseases: Excess nitrogen elevates protein and amino acid levels in plant tissue, making plants more attractive targets for insect pests and fungal pathogens.

Best-Practice Tips for Urea Fertilization

Analyze your soil first. Never apply urea without knowing your soil’s actual nitrogen status   it may already have sufficient nitrogen and require no addition.

Incorporate into the soil. Never broadcast urea on the surface and leave it. Mix it into the top soil layer to minimize volatilization.

Keep away from roots and foliage. Apply urea in the zone surrounding the plant’s roots   in furrows or shallow trenches   never directly against the trunk or stem.

Do not mix with alkaline fertilizers. Avoid combining urea with lime or any alkaline soil amendment.

Do not irrigate immediately after soil application. Allow time for the fertilizer to interact with the soil before watering.

Respect the recommended dose. Over-application causes plant burn and environmental contamination.

Time your application correctly. The best window is the beginning of the growing season or during the active vegetative growth phase.

Store properly. Keep urea in a cool, dry place away from moisture to prevent clumping and product degradation.

Frequently Asked Questions

Which is better for foliar spray urea or nitrate?
Urea is superior for foliar application. Its small molecular size allows it to cross cell membranes rapidly   absorption can begin within 30 minutes of spraying. Nitrate fertilizers take longer and are generally less effective as foliar applications. Nitrate is better suited for soil application, particularly for crops that need a rapid nitrogen boost.

Can urea be mixed with NPK fertilizers?
Yes. Urea can be combined with NPK fertilizers such as superphosphate and potassium sulfate. However, do not mix urea directly with alkaline fertilizers (such as lime) or with phosphoric acid.

How long does urea take to show results?
In the soil, urea takes approximately 1–3 days to hydrolyze via the enzyme urease, converting first to ammonium and then to nitrate   the form plants absorb. In some conditions this process can take up to 7 days. Foliar urea acts significantly faster, with absorption beginning within 30 minutes to 1 hour of application.

Urea fertilizer is the crown of nitrogen fertilization   the most concentrated and most cost-effective nitrogen source available. But using it well requires understanding. It is not enough to simply buy urea; you need to know what it does for plants, when to apply it, how to apply it, and in what quantity   so that your crops benefit without your plants burning or your soil degrading.

At Al-Qawafel, we supply the best urea fertilizer types from verified sources and provide free consultations to determine the right dosage for your land and crop. Our team of agronomists follows up with you at every step to ensure maximum yield at minimum cost.

Contact the Al-Qawafel team today at alqawafel.com, or visit your nearest branch.