1、Response of Onion to Application of UREA and NPS Fertilizer Rates Under

Applying fertilizer is a crucial input to boost vegetable yields, especially onion yields. The study aimed to determine the ideal rate of NPS and UREA fertilizer under irrigation. Materials and Methods: It was conducted in Mareko, Guraghe Zone in 2017 and 2018.

2、Urea Foliar Fertilization Affects Onion Weight and Nutrient Content

Three foliar sprays of urea with 3 days interval on onion plants showed that bulb fresh and dry weight were increased by urea levels to 5000 mg L -1 without any damage to leaves (Charbaji, et...

3、Nitrogen nutrition and fertilization of onions (Allium cepa L.)–A

The overview of onion N use and N fertilizer management practices presented in this article can help choose optimal N fertilization practices based on site-specific conditions to achieve high N use efficiency and minimize losses.

4、Fertilizer Management for Onion: NPK Ratio, and Micronutrients

Onions benefit from proper fertilization (ideally based on soil test results), although high nitrogen fertilizers should be used with caution. Excessive nitrogen can delay bulb formation, maturation, and Onion storage.

Comparative Effect of Organic and Inorganic Fertilizer Treatments on

The yield in weight of the Onion bulb was increased through the application of poultry manure followed by organic manure, cow dung and least in urea which showed the supremacy of organic manure over inorganic fertilizers in vegetable production.

Urea Foliar Fertilization Affects Onion Weight and Nutrient Content

This research was undertaken to investigate effects of foliar application of urea on onion (Allium cepa L.), cv. Salamony, in Syria. Four levels of urea, 0, 2,000, 3,500, and 5,000 mg·L −1, were evaluated.

Onion Growth Fertilizer Plan: Fertilization Schedule

Specific recommendations for adjusting soil pH for onions are provided. To lower the pH, sulfur or acid-forming fertilizers like ammonium sulfate or urea can be applied. In contrast, lime or alkaline-forming fertilizers like calcium carbonate or calcium nitrate can be used.

The Effect of Different Fertilization Regimes on Yield, Selected

The study showed that Ekofert fertilizer applied at all three levels produced similar or higher yields than the standard fertilization regimes used in conventional farming in all three seasons.

Iron (Fe) and zinc (Zn) coated urea application

Abstract Onion (A. cepa) is an important horticulture crop which is sensitive to nutrient limitations worldwide. Urea hydrolysis to ammonia (NH 3) and carbon dioxide (CO 2), due to soil urease activity, causes urea-N loss.

Onion fertilization management

This dual-purpose fertilization supports both the quality of the Welsh onions and the growth of the intercropped wheat. By October, the onions have already reached their maximum leaf number and leaf area, so no additional fertilization is needed.

Onion Fertilization: Compound Fertilizer vs. Urea

In agricultural production, rational fertilization is key to improving crop yield and quality. Both compound fertilizers and urea are commonly used, but they have distinct characteristics and suitability. This article analyzes the advantages and disadvantages of using compound fertilizers and urea for onions, and offers guidance on how to choose the appropriate fertilizer based on specific conditions.

I. Definitions and Components

1. Compound Fertilizer

• Definition: A fertilizer composed of two or more nutrient elements (e.g., nitrogen, phosphorus, potassium) in a specific ratio.
• Advantages: Provides multiple nutrients, meets diverse plant growth needs, and improves fertilizer utilization efficiency.
• Disadvantages: Higher cost compared to single-nutrient fertilizers; some components may reduce the effectiveness of certain nutrients.

2. Urea

• Definition: A nitrogen-rich compound primarily used to supplement soil nitrogen.
• Advantages: Lower cost, easy storage and transport, and rapid promotion of crop growth.
• Disadvantages: Excessive use may lead to nitrogen toxicity, harming crop health and causing soil degradation.

II. Suitability Analysis

1. Compound Fertilizer

• Versatile Application: Suitable for a wide range of crops due to its balanced nutrient profile.
• Soil Health Benefits: Formulations containing microelements can improve soil structure and water retention.
• Economic Considerations: Preferred by farmers with better economic conditions due to its comprehensive effects.

2. Urea

• Rapid Growth Support: Ideal for crops requiring quick nitrogen replenishment, especially during early growth stages.
• Cost-Effective: Economical for crops needing large amounts of nitrogen to boost yields.
• Caution in Use: Avoid overapplication to prevent nutrient imbalance and soil salinization.

III. Fertilization Recommendations

1. Soil Testing

• Assess Soil Conditions: Conduct soil tests to determine nutrient levels, pH, and organic matter content.
• Customized Plans: Design personalized fertilization strategies based on test results to optimize efficiency.
• Monitor Crop Response: Observe growth patterns and adjust fertilization practices accordingly.

2. Application Methods

• Even Distribution: Ensure uniform spread to avoid localized over-fertilization.
• Optimal Dosage: Tailor fertilizer amounts to crop requirements and soil conditions.
• Timely Application: Apply at critical growth stages (e.g., spring topdressing, autumn basal fertilization).

3. Key Considerations

• Avoid Monoculture Issues: Rotate crops or alternate fertilizers to prevent soil nutrient depletion.
• Balanced Formulations: Combine compound fertilizers and urea based on crop type and soil properties.
• Environmental Protection: Minimize synthetic fertilizer use and prioritize organic alternatives to reduce ecological impact.

IV. Conclusions and Recommendations

The choice between compound fertilizers and urea for onions depends on crop needs, soil conditions, and sustainability goals. Compound fertilizers are recommended for their balanced nutrition and soil-enhancing properties, while urea is suitable for rapid growth phases. Scientific fertilization practices not only maximize yields but also safeguard soil health and environmental safety. Farmers should adopt a holistic approach, integrating fertilizer characteristics, crop requirements, and soil analysis to achieve optimal results.