1、Towards precise nitrogen fertilizer management for sustainable

Effective nitrogen (N) fertilizer management is crucial for meeting the growing demand for crop production while maintaining planetary boundaries within sustainable limits.

2、Enhancing nitrogen use efficiency in agriculture by integrating

Enhancing nitrogen use efficiency (NUE) is essential for promoting sustainable crop production and mitigating the negative impacts of nitrogen loss, such as water pollution and greenhouse gas emissions.

3、A plan for efficient use of nitrogen fertilizers

A global analysis finds that nitrogen fertilizers could be used more efficiently if their international distribution across croplands was altered — a measure that would also decrease...

4、Nitrogen use efficiency—a key to enhance crop productivity under a

Therefore, enhancing nitrogen use efficiency (NUE) is critical in crop improvement programs and agronomic management systems.

Effects of Nitrogen Application Strategies on Yield, Nitrogen Uptake

In this study, a field plot trial with five N fertilization application strategies was conducted in the maize field from 2021 to 2022 in the Ningxia Yellow Irrigation District, Northwest China.

Optimizing nitrogen fertilizer use for more grain and less pollution

Abstract Optimal nitrogen (N) management is critical for efficient crop production and agricultural pollution control. Approximate 210–220 kg ha −1 N fertilizer was applied in millions of small plots through broadcasting way in China, resulting in over and loss of N fertilizers.

(PDF) Nitrogen use efficiency and optimization of nitrogen

In most agroecosystems, nitrogen (N) is the most important nutrient limiting plant growth. One management strategy that affects N cycling and N use efficiency (NUE) is conservation agriculture...

Nitrogen Use Efficiency and Agricultural Sustainability

The rational use of nitrogenous fertilisers may improve nitrogen use efficiency (NUE) and mitigate environmental N-pollution to meet UN SDGs. This chapter highlights the trends, drivers and impacts of excessive N use on the various ecosystem services and NUE in significant crops.

Localized nitrogen management strategies can halve fertilizer use in

Using a localized nitrogen management model for wheat, maize and rice, this study estimates the environmental and economic benefits of improving nitrogen use efficiency at the county level.

Optimal timing and rate of nitrogen fertilizer use: An integrated

We use this framework to estimate nitrogen fertilizer application inefficiency and to determine the optimal rate and timing of fertilizer application. We apply this framework to wheat production at the field scale, using an agronomic simulation model calibrated to experimental data from Australia.

Nitrogen fertilizers are indispensable in agricultural production, primarily providing the nitrogen nutrients essential for plant growth. Rational application of nitrogen fertilizers can promote crop development, enhance yields, and improve quality. Below is a detailed analysis of nitrogen fertilizer usage effectiveness:

I. Types and Characteristics of Nitrogen Fertilizers

1. Urea Urea, chemically known as carbamide (molecular formula: CO(NH₂)₂), has a high nitrogen content (46%). It readily hydrolyzes into ammonia and is suitable for various soil types, especially sandy and loamy soils. urea decomposes rapidly under high temperatures, so application should avoid hot weather.

2. Ammonium Bicarbonate Ammonium bicarbonate (NH₄HCO₃) is a weakly alkaline nitrogen fertilizer with a nitrogen content of 34%. Its alkalinity helps neutralize acidic soils, making it ideal for acidic environments.

3. Ammonium Nitrate Ammonium nitrate (NH₄NO₃) is a strongly alkaline nitrogen fertilizer with stable nitrogen content (35%). It is suited for neutral or slightly alkaline soils and crops requiring rapid nitrogen release, such as corn and rice.

II. Application Methods for Nitrogen Fertilizers

1. Base Fertilization Apply nitrogen fertilizers uniformly before planting to establish a foundational nitrogen supply, ensuring continuous nutrient availability throughout the crop’s lifecycle.

2. Topdressing Apply additional nitrogen during the growing season via irrigation or foliar spraying based on crop needs and soil conditions. This boosts growth and yield but requires careful dosage to avoid excess nitrogen.

3. Mixed Application Combine nitrogen fertilizers with others (e.g., phosphorus, potassium) to enhance nutrient uptake efficiency and reduce environmental pollution.

III. Timing and Techniques for Nitrogen Application

1. Early Application For nitrogen-loving crops (e.g., legumes, vegetables), apply base fertilizers before planting to ensure adequate nitrogen supply throughout the growth cycle.

2. Timely Topdressing For high-nitrogen-demand crops (e.g., corn, rice), topdress during critical stages like jointing and heading to maximize yield.

3. Foliar Spraying For fast-growing crops (e.g., wheat, rapeseed), apply nitrogen via foliar sprays for quick absorption and accelerated growth.

IV. Key Considerations

1. Avoid Overapplication Excessive nitrogen causes prolonged vegetative growth and delayed maturity, reducing yield and quality. Use precise dosages.

2. Monitor Soil pH Different nitrogen fertilizers affect soil pH. For example, ammonium nitrate is strongly alkaline, while urea is neutral. Adjust applications to maintain optimal pH for nutrient absorption.

3. Prevent Mixing with Phosphate/Potash Combining nitrogen with phosphate or potash fertilizers may reduce the availability of these elements. Coordinate fertilizer ratios to avoid nutrient imbalances.

rational nitrogen fertilizer use significantly improves crop yields and quality. Select appropriate fertilizer types and application methods based on crop needs and soil conditions. Avoid overapplication and improper mixing to ensure efficient nutrient use and healthy crop growth.