1、Optimized nutrients management improved citrus yield and fruit quality

Among different optimized fertilization methods, the effect of optimized NPK + medium and/or micro element fertilizer on citrus yield and fruit quality was the best, especially NPK decrement ≤25% between optimized NPK measures.

2、CMG14/CG092: 2026–2026 Florida Citrus Production Guide

Most commonly used commercial fertilizers are water-soluble, meaning they are readily available to plants when properly applied. Soluble fertilizers are applied to the soil dry in granular form, liquid through fertigation, or foliarly.

3、Water and nitrogen use efficiencies in citrus production: A meta

Based on our analyses, we estimated that reducing over-optimal irrigation to optimal irrigation may increase citrus yield by 20%, WUE by 30% and NUE by 15%. Similarly, reducing over-optimal N fertilization to optimal N fertilization may increase yield by 10%, WUE by 15% and NUE by 40%.

4、Management of Nitrogen Fertilizer Application in Citrus Orchards

These findings and the long-term survey of citrus fertilization experiments in Iran and elsewhere indicate that annual application of 200 kg N/ha seems sufficient for stable fruit production,...

5、Citrus Fertilizer Schedule & Crop Guide

The exact fertilization program should be determined according to the specific crop needs, soil and water conditions, cultivar, and the grower’s experience. For detailed recommendations, consult a local Haifa representative.

Nutritional status of different citrus trees and the recommended

Mineral nutrient contents in citrus fruits, as well as the fertility status of citrus orchard soils were investigated across China, specific fertilizer rates of nitrogen, phosphorous and potassium were proposed for each type of citrus in China.

Nitrogen fertilization in citrus orchards

Management of nitrogen fertilizer application for citrus trees was evaluated to obtain an enlightened understanding of plant nitrogen requirements, amount of fertilization needed, appropriate fertilization timing, and nitrogen uptake and storage in these plants.

Effects of Fertilization Approaches on Plant Development and

Water and fertilizer are crucial for citrus growth and fruit yield. The amount of fertilizer in citrus management is associated with production cost and environmental problems. Most citrus-producing areas around the world recommend fertilizer amounts of 200–350 kg/ha N, 100–200 kg/ha P and 150–450 kg/ha K.

[Optimized nutrients management improved citrus yield and

Among different optimized fertilization methods, the effect of optimized NPK + medium and/or micro element fertilizer on citrus yield and fruit quality was the best, especially NPK decrement ≤25% between optimized NPK measures.

Citrus Fertilizer Management: Nutrient Requirements and Application

Mature citrus trees need less nitrogen per unit of canopy area but more nitrogen per unit of fruit yield. Recommended rates range from 0.5 to 1.5 kg per tree per year, depending on fruit yield and quality goals.

In agricultural production, the rational application of nitrogen fertilizers is one of the critical measures to ensure the healthy growth of citrus trees. determining the appropriate amount of fertilizer and irrigation to ensure that plants can fully absorb nutrients while avoiding problems such as soil salinization and nutrient imbalance caused by excessive fertilization remains a challenge for many farmers. This article will explore the scientific management of citrus nitrogen fertilization and irrigation practices, focusing on the relationship between fertilizer application rates and irrigation volumes.

I. Importance of Nitrogen Fertilizer Application Rates for Citrus

1. Promoting Growth and Development of Citrus Trees

Nitrogen fertilizer is an essential nutrient element during the growth of citrus trees. It plays a vital role in promoting leaf growth, increasing chlorophyll content, and enhancing photosynthetic efficiency. A proper amount of nitrogen fertilizer can effectively stimulate root development, strengthen the tree's ability to absorb water and minerals, and thereby promote overall plant growth.

2. Impacting Fruit Quality

The rational application of nitrogen fertilizers directly affects not only the growth of citrus trees but also the quality of the fruits. Adequate nitrogen supply promotes the synthesis of sugars, vitamin C, and other nutrients in citrus fruits, improving their taste and quality. Conversely, excessive nitrogen application may lead to insufficient sugar accumulation in fruits, compromising their quality.

3. Maintaining Soil Fertility Balance

Reasonable nitrogen fertilization helps maintain soil fertility balance. Excessive nitrogen can cause soil acidification, compaction, and reduced aeration and water-holding capacity, hindering normal root growth. fertilization rates and timing should be adjusted based on soil conditions and tree requirements to achieve sustainable soil health.

II. Methods for Calculating Citrus Nitrogen Fertilizer Application Rates

1. Soil Testing

Soil testing is recommended to accurately determine nitrogen requirements. By analyzing soil nitrogen content, pH, organic matter, and other parameters, farmers can assess soil fertility and acidity, providing a scientific basis for fertilization.

2. Crop Demand Reference

Different citrus varieties have varying nitrogen needs. Early-maturing varieties like navel oranges and satsumas typically require more nitrogen, while late-maturing ones like blood oranges and red-fleshed navel oranges need less. Fertilization plans should account for varietal characteristics.

3. Empirical Methods and Recommended Values

Experience-based estimation can supplement scientific approaches. For example, adult citrus trees generally require 2-3 kg of urea per mu (0.067 hectares). weather and soil conditions should be considered, and local agricultural departments' recommendations or expert guidance should be followed to ensure rational application.

III. Precautions for Citrus Nitrogen Fertilization

1. Timing of Fertilization

Fertilization timing significantly impacts tree growth and fruit quality. Optimal periods include autumn (after leaf fall) and spring (before budding), when lower temperatures favor fertilizer decomposition and absorption. Additional top-dressing during the growing season supports rapid growth and fruit development.

2. Avoiding Over-Fertilization

Excessive nitrogen can lead to soil salinization and nutrient imbalances. Apply fertilizers in "small amounts and multiple times" to prevent overuse. Balance with other nutrients (e.g., calcium, magnesium, phosphorus) to maintain soil health.

3. Coordination with Other Fertilizers

While applying nitrogen, ensure micronutrient supplementation. Use compound or organic fertilizers to achieve comprehensive soil nutrient balance.

4. Environmental Protection

Minimize chemical fertilizer use and prioritize organic alternatives to reduce soil and water pollution. Adopt proper application methods to minimize environmental harm.

IV. Matching Irrigation Volumes with Nitrogen Fertilization

1. Principles for Irrigation Control

Irrigation volume depends on soil moisture, climate, and crop water needs. Increase irrigation during droughts or hot weather to maintain soil moisture; reduce it in cold or dry conditions to avoid root hypoxia.

2. Irrigation Calculation Methods

Irrigation volume can be estimated using: [ ext{Irrigation Volume} = ext{Soil Moisture Coefficient} imes ext{Crop Water Requirement} ] The soil moisture coefficient is measured with a hygrometer, while crop water requirements vary by variety, growth stage, and weather. Local guidelines or expert advice may refine calculations.

3. Adjusting Irrigation Volumes

Flexibly adjust irrigation based on soil moisture and tree conditions. Reduce irrigation if soil is too wet; increase it if too dry. Monitor weather changes to optimize irrigation plans.

4. Choosing Irrigation Methods

Drip irrigation and sprinkler irrigation are ideal options. Drip systems deliver water directly to roots, improving efficiency, while sprinklers ensure even coverage. Choose methods considering costs, ease of operation, and maintenance.

scientific management of nitrogen fertilization and irrigation is crucial for citrus health and fruit quality. By balancing fertilizer rates and irrigation volumes, farmers can meet trees' needs while minimizing environmental risks. Flexible adjustments based on field conditions are key to achieving optimal results.