1、Yield and content in nitrates, minerals and ascorbic acid of leeks and turnips grown under mineral or organic nitrogen fertilizations

The influence of mineral NPK fertilizers and organic fertilizers such as manure compost, woodchip compost and blood meal on the yields and the nutritive value of leeks and turnips were compared.

2、Nitrogen Nutrition in Crops and Its Importance in Crop Quality

In fruits, nitrogen affects several quality aspects such as size, shape, color, texture, flavor, and composition. In this chapter, we discuss the effects of N fertilization on crop quality of major crops including food, oilseed, horticultural, and fodder crops.

3、Fertilizer effects on yield, mineral and amino acid composition, dietary fibre content and nutritive value of leeks

Increasing N contents, whether due to N applications or P or K deficiency, decreased the content of all essential and some other amino acids in crude protein. Both S and severe P deficiency had a pronounced negative effect on amino acid composition and chemical score.

A plan for efficient use of nitrogen fertilizers

Nitrogen is the main nutrient required for crop growth, and therefore needs to be added to boost crop yield — usually in the form of fertilizers and manure, but in some cases through...

Leeks in the Garden

Fertilization: In addition to any fertilizer used at planting, leeks need additional nitrogen to produce optimum yields. Side dress with nitrogen at 1⁄4 lb. (21-0-0) per 100 square feet in mid-May and again in late June.

MERJPSB

Results indicated that different levels of nitrogen fertilizer on all growth characteristics were significant at P<0.01. Nitrogen fertilizer caused head formation to accelerate and delayed the bolting date of lettuce.

Nitrogen Fertilizer Composition and Method to Improve Detection and Lessen the Explosive Potential of Nitrogen

One or both of the urea and nitrate-based fertilizer are coated with an agriculturally compatible material. The fertil izer composition provides significant nitrate nitrogen for legitimate agricultural use yet is not amenable to the produc tion of an explosive by crushing or by aqueous extraction.

Large variation in nitrogen isotopic composition of a fertilized legume

Plant nitrogen isotopic compositions are highly variable and are influenced by a diversity of environmental and anthropogenic factors, including the application of animal-derived fertilizers.

Nitrogen Fertilizer Influences Fruit Quality, Soil Nutrients and Cover Crops, Leaf Color and Nitrogen Content, Biennial Bearing and Cold Hardiness of

Nitrogen (N) containing fertilizers have been commonly applied to fruit trees in the Pacific Northwest over the past few decades to increase vigor and yield (Batjer et al., 1966).

A comparison of organic and inorganic nitrogen fertilizers: Their nitrate

A comparison of organic and inorganic nitrogen fertilizers: Their nitrate-N and ammonium-N release characteristics and effects on the growth response of lettuce (Lactuca sativa L. cv. Fortune).

Nitrogen fertilizers are one of the most essential nutrients for plant growth, primarily providing the nitrogen (N) that plants require. Selecting the appropriate nitrogen fertilizer is critical for enhancing leek yield and improving quality. Below is a detailed analysis of the components of nitrogen fertilizers for leeks:

1. Ammonium Nitrate (NH₄NO₃)

• Composition: A common nitrogen fertilizer with the chemical formula NH₄NO₃, composed of nitrogen, hydrogen, oxygen, and ammonia.
• Characteristics: High nitrogen content (~30%), suitable for rapidly promoting leek growth.
• Advantages: Easy to dissolve and absorb quickly by plants.
• Disadvantages: Relatively expensive and has a significant environmental impact, requiring cautious use.

2. Urea (CO(NH₂)₂)

• Composition: A compound with ~66.7% nitrogen content, chemical formula CO(NH₂)₂.
• Characteristics: Moderate nitrogen release, ideal for slow-release applications like leek cultivation.
• Advantages: Cost-effective and less polluting, though decomposition is slower.
• Disadvantages: Slower nitrogen release compared to other fertilizers, requiring longer to take effect.

3. Nitrogen-Sulfur-Based Compound Fertilizers (e.g., NPK Fertilizers)

• Composition: Typically contains nitrogen (N), phosphorus (P), and potassium (K), with the formula (NH₄)(SO₄)(K₂O).
• Characteristics: Comprehensive nutrition suitable for multiple crops, including leeks.
• Advantages: Meets leek’s N, P, and K needs, improving fertilizer efficiency.
• Disadvantages: Expensive and requires careful dosing to avoid nutrient imbalance.

4. Bio-Organic Fertilizers

• Composition: Derived from animal manure, crop residues, etc., processed through fermentation.
• Characteristics: Rich in microorganisms and organic matter, improves soil structure and water/nutrient retention.
• Advantages: Provides stable, long-term nitrogen supply and benefits soil health.
• Disadvantages: Higher cost and requires thorough decomposition before use to avoid growth inhibition.

5. Nitrogen Gas-Based Fertilizers

• Composition: Produced by converting nitrogen gas into a usable form under high pressure.
• Characteristics: High purity and pollution-free, directly absorbed by plants.
• Advantages: Environmentally friendly and efficient, suited for eco-sensitive environments.
• Disadvantages: High production costs and requires specialized equipment and technology.

6. Fertilization Recommendations for Nitrogen Fertilizers

• Timing: Apply during key growth stages (e.g., spring) based on leek growth cycles and soil conditions.
• Method: Incorporate into soil via deep tillage to maximize efficiency. Avoid overapplication to prevent excess nutrients or loss.
• Considerations: Choose fertilizers based on type, soil compatibility, and crop needs. Combine with other fertilizers for optimal results.

Different nitrogen fertilizers can address leek’s nutritional requirements. When selecting, consider factors such as composition, characteristics, environmental impact, and compatibility with soil and crops. A rational fertilization strategy not only boosts yield and quality but also reduces environmental harm, supporting sustainable agricultural goals.