Guide to Using Biofertilizer as a Substitute for Urea Fertilizer

Urea fertilizer is a major nitrogen source for plants, but its price keeps soaring and its environmental impact cannot be ignored. As a substitute for urea, nitrogen-fixing biofertilizers offer a natural, economical, and eco-friendly solution. This article will thoroughly discuss the causes of dependence on urea, symptoms of nitrogen deficiency in plants, and how the microbial consortium from Biosolution products such as Rhizobium sp. and Azospirillum sp. can be a smart solution for sustainable agriculture.

Why Urea Fertilizer Needs to Be Reduced

Urea fertilizer (CO(NH₂)₂) is indeed quickly available to plants, but excessive use causes various problems. Economically, urea prices continue to rise due to fluctuations in natural gas and import policies. Environmentally, unabsorbed urea volatilizes as ammonia or leaches as nitrate, contaminating groundwater. Greenhouse gas emissions (N₂O) from nitrogen fertilizers are also significant. Therefore, finding a substitute for urea fertilizer is a priority for modern farmers.

According to data from the Ministry of Agriculture, urea fertilization efficiency in Indonesia is only about 30–40%, meaning most nitrogen is lost. By using N-fixing biofertilizers, we can utilize abundant atmospheric nitrogen (78% of air) biologically. This technology has been proven in various countries and is being adopted by progressive farmers in Indonesia.

Symptoms of Nitrogen Deficiency in Plants and Diagnosis

Plants deficient in nitrogen show typical symptoms: yellowing leaves (chlorosis) starting from older leaves, stunted growth, and decreased fruit/seed production. In rice, leaves turn pale green to yellow, with few tillers. In corn, leaves yellow in an inverted V shape. These symptoms are often mistaken for pest or disease attacks, when the main cause is nitrogen deficiency.

For diagnosis, farmers can perform a quick test using a leaf color chart (LCC) or soil test. However, the long-term solution is not just adding urea, but optimizing nitrogen supply through N-fixing microbes. By applying 5-in-1 Liquid Biofertilizer Formula, plants receive a continuous nitrogen supply from biological fixation.

N-Fixing Biofertilizer: How It Works and Advantages

Nitrogen-fixing biofertilizers contain living microbes that can convert atmospheric N₂ into ammonia (NH₃) that plants can absorb. In Biosolution products, there are two main N-fixing strains: Rhizobium sp. (symbiotic with legumes) and Azospirillum sp. (associative with grasses like rice and corn).

Rhizobium infects legume roots forming root nodules, where N₂ fixation occurs. Azospirillum lives around the roots of gramineae and contributes nitrogen directly. Both work synergistically with Bacillus subtilis which solubilizes phosphate, thus optimizing nutrient availability. This mechanism makes biofertilizer an effective substitute for urea fertilizer.

Advantages of biofertilizer over urea:

• Does not cause environmental pollution
• Improves soil structure
• Reduces production costs by up to 50%
• Increases crop yields by 20–30% (field trial data)

Guide to Applying Biofertilizer to Reduce Urea

Biofertilizer application must be precise to keep microbes alive and active. Here is a practical guide:

1. Application time: Morning before 10 AM or afternoon after 4 PM, avoid direct UV light.
2. Dosage: Mix 5–10 ml of product per liter of water, drench onto the root zone or spray onto the soil.
3. Frequency: Repeat every 10–14 days, at least 3–5 times per growing season.
4. Combination with urea: Reduce urea dosage by 50% from the initial recommendation. For example, if usually 200 kg urea/ha, use only 100 kg + biofertilizer.

Field trial results in West Java showed that rice treated with biofertilizer + 50% urea produced grain yield equivalent to 100% urea. In fact, in the second season, urea dosage could be further reduced because the soil was already enriched with microbes.

Case Study: Farmer Success in Reducing Urea

Mr. Budi, a rice farmer in Karawang, reported saving 40% on fertilizer costs after using Complete Plant Nutrition Formula. "I used to use 300 kg of urea per hectare, now I only use 150 kg mixed with biofertilizer. The yield actually increased by 25%," he said. Similar results were reported by corn farmers in Kediri, whose production increased from 8 tons to 10 tons per hectare.

This success is supported by a consortium of 5 strains in one bottle: Rhizobium, Azospirillum, Bacillus subtilis, Pseudomonas fluorescens, and Trichoderma sp.. Each has a specific role, from N fixation, P solubilization, to pathogen control.

Conclusion

Replacing urea fertilizer with N-fixing biofertilizer is not only possible but also profitable. By reducing urea dosage by up to 50%, farmers can cut costs, increase yields, and protect the environment. Biosolution products with a consortium of 5 superior microbial strains are ready to be the solution. For further consultation, contact our team via WhatsApp or see our products.