Shallot Biofertilizer: The Secret to Large and Long-Lasting Bulbs

Shallot farmers in Brebes often face challenges of small bulbs, flower drop, and short shelf life. Yet market demand continues to rise, especially for large, durable bulbs. The solution lies in the right shallot biofertilizer. Biosolution presents Formula POC Kualitas Umbi, an innovative product based on a consortium of PGPR and seaweed extract that has been field-tested and proven to increase bulb weight by 15-25% and reduce flower drop by up to 30%. This article thoroughly examines field trial results, mechanisms of action, and proper application methods.

Field Trial Results of Formula POC Kualitas Umbi in Brebes

Field trials were conducted on partner farmer land in Dukuhwringin Village, Wanasari District, Brebes, during the April-June 2024 planting season. The variety used was Bima Brebes. A 500 m² treatment plot was applied with Formula POC Kualitas Umbi at a dose of 4 ml/L water, sprayed every 7 days from 30 to 60 days after planting (DAP). As a control, a plot used conventional chemical fertilizers.

Results showed that fresh bulb weight per clump in the treatment reached 285 grams, while the control was only 235 grams — a 21.3% increase. Average bulb diameter was 3.8 cm (control 3.2 cm). The percentage of grade A bulbs (diameter >3.5 cm) reached 78% in the treatment, compared to only 55% in the control. Additionally, flower drop decreased drastically from 15% to 5%. Equally important, treated bulbs could last up to 4 months in room temperature storage without rot, while control bulbs began to spoil in the second month.

These data show that shallot biofertilizer Formula POC Kualitas Umbi not only increases quantity but also quality and shelf life of bulbs.

Mechanism of Action of Formula POC Kualitas Umbi

PGPR Consortium as a Trigger for Growth Hormones

Formula POC Kualitas Umbi contains a consortium of Bacillus subtilis, Pseudomonas fluorescens, and Azospirillum sp. These bacteria produce phytohormones such as auxins, gibberellins, and cytokinins that stimulate bulb cell division and enlargement of storage tissues. Additionally, PGPR solubilizes phosphate and provides micronutrients like zinc and iron essential for bulb protein synthesis.

Seaweed Extract as a Natural Source of Cytokinins

Ascophyllum nodosum seaweed extract is rich in natural cytokinins (zeatin, kinetin) that stimulate simultaneous bulb cell division. Cytokinins also delay leaf senescence, prolonging photosynthesis and producing more carbohydrates translocated to the bulbs.

Humic and Fulvic Acids as Nutrient Carriers

Humic and fulvic acids increase soil cation exchange capacity, help release bound nutrients, and stimulate root growth. More and longer roots enhance water and nutrient uptake, supporting uniform and dense bulb formation.

Proper Application Methods for Maximum Results

Timing and Dosage

Application begins when plants enter the bulbing phase, i.e., 30 days after planting (DAP). The recommended dose is 3-5 ml per liter of water, sprayed evenly over all plant parts, especially leaves and stem bases. Application frequency is every 7-10 days until 60 DAP.

Application Technique

Use a fine mist sprayer (nozzle) in the morning before 10 AM or in the afternoon after 4 PM to avoid evaporation. Ensure the solution covers both sides of the leaves. For optimal results, combine with adequate irrigation and organic base fertilization.

Additional Tips

• Do not mix with copper- or chlorine-based chemical pesticides as they can damage PGPR bacteria.
• Store the product in a cool, dark place, away from direct sunlight.
• Apply regularly; do not skip applications as the bulbing phase is critical.

Advantages of Biofertilizer Over Conventional Chemical Fertilizers

Using shallot biofertilizer offers many advantages over synthetic chemical fertilizers:

1. Environmentally friendly: Leaves no harmful chemical residues in soil or water.
2. Improves soil structure: PGPR produces polysaccharides that bind soil particles, enhancing aeration and drainage.
3. Increases shelf life: Humic and fulvic acids help strengthen bulb cell walls, reducing water loss and storage fungal attacks.
4. Cost efficiency: With low dosage (3-5 ml/L) and frequency of 7-10 days, application costs are lower compared to chemical fertilizers that must be applied every 3-5 days.

A study in the Indonesian Journal of Agrotechnology (2023) showed that PGPR application on shallots increased bulb weight by up to 30% compared to chemical controls. This proves that agricultural biotechnology is the solution for the future.

Testimonials from Brebes Farmers: Abundant Harvest, Doubled Profits

Mr. Sutrisno, a shallot farmer in Dukuhwringin Village, expressed satisfaction after switching to Formula POC Kualitas Umbi. "My bulbs used to be small and rotted quickly. After using this biofertilizer, the bulbs are large, dense, and can be stored for up to 4 months. The selling price is also higher," he said. He added that his fertilizer costs actually dropped by 20% due to lower dosage and less frequent application.

Mrs. Karsih, a farmer in Bulakamba District, shared similar sentiments. "I was hesitant at first, but after seeing my neighbor's results, I tried it. Alhamdulillah, this harvest increased by 30%. Fewer flowers dropped, bulbs were uniformly large. I have recommended it to the farmer group," she recounted.

These testimonials reinforce field trial data that shallot biofertilizer Formula POC Kualitas Umbi is truly effective.

Conclusion

Biosolution's Formula POC Kualitas Umbi shallot biofertilizer is the right solution for Brebes farmers who want to increase production of large, long-lasting bulbs. Field trial results prove a 15-25% increase in weight, 30% reduction in flower drop, and shelf life of up to 4 months. With its content of PGPR consortium, seaweed extract, and humic acid, this product not only increases harvest quantity but also quality and land sustainability. Consult your needs with the Biosolution team via WhatsApp to get genuine products and proper application guidance. Also get Liquid 5-in-1 Biofertilizer Formula as a companion for complete plant nutrition.

Also read: How to Make Your Own Biofertilizer for a DIY alternative.