1、Citrus Fertilizer Management: Nutrient Requirements and Application

Fertilizer management involves understanding the nutrient requirements of different citrus varieties, soil pH and fertility, application methods and timing, and environmental factors affecting nutrient uptake and utilization.

2、Winter Fertilization for Citrus Maxima (Wugan): Optimal

Winter fertilization, the most crucial annual application for Wugan, significantly impacts spring shoot growth and fruit maturation in the subsequent year. Below is a detailed guide on timing, methods, and precautions for winter fertilization.

3、Fertilizing a Citrus Tree: What Month, How Much, & Best Ratios

Fertilize your tree throughout the year when you first plant it. Nourish your tree once every 1-2 months when the tree is actively growing. When your tree goes through a dormant period, or a time when it stops growing, fertilize it once every 3 months.

How Much Fertilizer for Citrus Trees: A Complete Guide to Proper

Unlock the secrets to thriving citrus trees with our comprehensive guide on fertilizer requirements. Learn to calculate the right amount based on tree age, size, and soil conditions. Explore various nutrient options, application techniques, and frequencies tailored to your tree's needs.

Citrus Fertilizer Schedule & Crop Guide

Haifa Group's Citrus Plant Crop Guide covers important aspects of growing citrus trees: citrus plant fertilizers, soil for citrus trees requirements, & more.

2026–2026 Florida Citrus Production Guide: Nutrition

The following description of citrus fertilizer uptake, soil and leaf testing, and nutrient recommendations was taken from EDIS publication SL253, Nutrition of Florida Citrus Trees, 3rd Edition, edited by Kelly T. Morgan and Davie M. Kadyampakeni.

Fertilizing Citrus: What, When, And How To Feed Citrus Trees

Learn how and when to fertilize citrus trees for healthy growth, strong yields, and sweet fruit—especially in hot, dry climates like Arizona.

Citrus Tree Fertilization Guide

In this guide, we will delve into the world of citrus tree fertilization, exploring the essential nutrients, fertilization schedules, and best practices for optimal growth.

The Backyard Orchard – Citrus – Module 3.1 – Annual Maintenance

Avoid fertilizing citrus trees after the end of June. Do not be tempted to believe “If a little is good, a lot is better.” Late or excessive fertilization will encourage vigorous growth, delay fruit maturity and decrease the cold hardiness of the tree.

When Should You Fertilize Citrus Trees: A Comprehensive Guide

Young Trees (1-3 years old): Fertilize every 2-3 months during the growing season (spring and summer) with a balanced citrus fertilizer. Mature Trees (4 years and older): Fertilize 3-4 times a year, once in early spring, twice during the summer, and once in early fall.

Waugan, scientifically named Citrus grandis 'Fuji', is a tropical citrus fruit valued for its thick skin, juicy flesh, and exquisite flavor. Proper fertilization is critical to its growth and fruit quality. Below is a detailed annual fertilization guide for three-year-old Waugan trees:

I. Base Fertilization

1. Timing: Apply in late February to early March, before new spring shoots emerge.
2. Method: Mix well-decomposed organic fertilizers (e.g., compost, chicken manure) into the soil evenly. Apply at a depth of 5–10 cm, avoiding direct contact with roots to prevent burning.
3. Notes:
   • Use fully decomposed fertilizers to avoid root diseases.
   • Adjust dosage based on soil fertility. Typically, apply 1–2 tons of organic fertilizer per mu (0.067 hectares).

II. Topdressing Fertilization

1. Budding Stage:

   • Apply nitrogen-balanced compound fertilizer or urea to promote shoot growth.
   • Dose: 2–3 kg per tree.

2. Flower Bud Differentiation:

   • Increase phosphorus and potassium fertilizers to support bud differentiation and fruit development.
   • Dose: 1–2 kg per tree.

3. Fruit Enlargement:

   • Continue phosphorus-potassium supplements to meet fruit growth demands.
   • Dose: 1–2 kg per tree.

4. Fruit Ripening:

   • Apply high-phosphorus, high-potassium compound fertilizer one month before maturity to enhance coloring and quality.
   • Dose: 3–5 kg per tree.

III. Foliar Fertilization

1. Timing: Apply as needed during the growing season, based on tree condition and soil fertility.
2. Fertilizer Choice: Use foliar sprays containing microelements (e.g., boron, iron, zinc) to improve disease resistance and promote flower-fruit development.
3. Application: Dilute fertilizer to proper concentration and spray evenly on leaves, avoiding main branches and fruits.
4. Notes: Apply on sunny days. Avoid rainy or humid conditions to ensure absorption.

IV. Integrated Water and Fertilizer Management

1. Technology: Combine irrigation (drip or sprinkler systems) with fertilization to deliver nutrients directly to roots.
2. Implementation: Fertilize simultaneously with irrigation, adjusting water volume and frequency based on soil moisture and tree needs.
3. Advantages: Enhances fertilizer efficiency, reduces waste, and lowers costs.
4. Notes:
   • Ensure proper equipment setup and maintenance.
   • Use compatible fertilizers and monitor system performance regularly.

V. Additional Considerations

1. Soil Testing: Conduct soil pH and nutrient analysis before fertilization to tailor plans accurately.
2. Pest Control: Prevent and manage diseases/pests during fertilization.
3. Crop Rotation: Avoid monoculture to prevent soil imbalance and pest buildup.
4. Environmental Factors: Adjust timing and methods based on climate, seasons, and temperature.

Scientific fertilization is key to healthy Waugan growth and premium fruit production. By optimizing fertilization strategies according to local climate, soil conditions, and tree growth stages, farmers can maximize yields, improve quality, and increase income.