Davie M. Kadyampakeni

0000-0002-5034-8190

Nutrition of Florida Citrus Trees, 3 Edition

Kelly T. Morgan and Davie M. Kadyampakeni

Nutrition of Florida Citrus Trees, 3rd Edition is an update of UF/IFAS Bulletin SP169, which provided guidelines for Florida citrus fertilization since 1995

Nutrition of Florida Citrus Trees, 3 Edition: Chapter 6. Fertilizer Sources and Formulations

Thomas A. Obreza, Brian J. Boman, Davie Kadyampakeni, Mongi Zekri, Kelly Morgan, and Tripti Vashisth

This document is SL460, one of a series of the Department of Soil, Water, and Ecosystem Sciences, UF/IFAS Extension. Original publication date February 2020. Visit the EDIS website at https://edis.ifas.ufl.edu for the currently supported version of this publication.

Nutrition and Irrigation Management for Florida HLB-Affected Trees

Tripti Vashisth, Davie Kadyampakeni, and Jamie D. Burrow

This is a two-sided poster. To improve production of huanglongbing (HLB) affected trees, nutrition, irrigation, and soil pH should be considered together, because each can influence the efficacy of the others in overcoming the effects of HLB on tree performance.

Citrus Leaf Sampling Procedures for Nutrient Analysis

Tripti Vashisth, Jamie D. Burrow, Davie Kadyampakeni, and Rhuanito S. Ferrarezi

Single-page guide to citrus leaf sampling procedures with additional suggestions for HLB-affected trees and guidelines for interpreting orange tree leaf nutrient analysis.

Soil Sampling Procedures

Davie Kadyampakeni, Kelly Morgan, Arnold Schumann, and Rhuanito S. Ferrarezi

Nutrition of Florida Citrus Trees, 3 Edition: Chapter 8. Recommended Fertilizer Rates and Timing

Thomas A. Obreza, Kelly T. Morgan, L. Gene Albrigo, Brian J. Boman, Davie Kadyampakeni, Tripti Vashisth, Mongi Zekri, Jim Graham, and Evan Johnson

This publication is part of SL253, Nutrition of Florida Citrus Trees, 3rd Edition. For references, a glossary, and appendices, please refer to the full document at https://edis.ifas.ufl.edu/ss478.

Nutrition of Florida Citrus Trees, 3 Edition: Chapter 9. Irrigation Management to Improve Nutrient Uptake

Kelly T. Morgan, Thomas A. Obreza, Davie Kadyampakeni, Said Hamido, Rhuanito Soranz Ferrarezi, and Mongi Zekri

This publication is part of SL253, Nutrition of Florida Citrus Trees, 3rd Edition. For references, a glossary, and appendices, please refer to the full document at https://edis.ifas.ufl.edu/ss478.

2025–2026 Florida Citrus Production Guide: Nutrition Management for Citrus Trees

Kelly T. Morgan, Davie M. Kadyampakeni, Mongi Zekri, Arnold W. Schumann, Tripti Vashisth, Muhammad A. Shahid, and Thomas A. Obreza

2025–2026 Florida Citrus Production Guide

Cover Crops for Florida Citrus: Practical Considerations and Their Impact on Soil Microbes

Emma Dawson, Davie Kadyampakeni, Ramdas Kanissery, Tara Wade, and Sarah L. Strauss

Recently, cover crops (CCs) have regained popularity as interest in soil health and agricultural sustainability increases among growers and consumers. However, their use in perennial agroecosystems and within subtropical climates is less common due to the climatic conditions and management practices of perennial systems. The aim of this publication is to provide Extension agents and growers with practical information to help them successfully cultivate CCs in Florida citrus groves. Written by Emma Dawson, Davie Kadyampakeni, Ramdas Kanissery, Tara Wade, and Sarah L. Strauss, and published by the UF/IFAS Department of Soil, Water, and Ecosystem Sciences, September 2025.

Fertigation for Citrus Trees

Mongi Zekri, Arnold Schumann, Tripti Vashisth, Davie Kadyampakeni, Kelly Morgan, Brian Boman, and Tom Obreza

A UF/IFAS numbered Fact Sheet. Published by Plant Systems

2025–2026 Florida Citrus Production Guide: Root Health Management

Davie M. Kadyampakeni, Kelly T. Morgan, and Sarah L. Strauss

2025–2026 Florida Citrus Production Guide

2025–2026 Florida Citrus Production Guide: Fertilizer Application Methods

Mongi Zekri, Arnold W. Schumann, Tripti Vashisth, Davie M. Kadyampakeni, Kelly T. Morgan, Brian Boman, Muhammad A. Shahid, and Thomas A. Obreza

2025–2026 Florida Citrus Production Guide

2025–2026 Florida Citrus Production Guide: Irrigation Management of Citrus Trees

Davie M. Kadyampakeni, Kelly T. Morgan, Mongi Zekri, Arnold W. Schumann, Sandra Guzmán, Fernando Alferez, Muhammad A. Shahid, and Thomas A. Obreza

2025–2026 Florida Citrus Production Guide

2025–2026 Florida Citrus Production Guide: Best Management Practices for Soil-Applied Agricultural Chemicals

Davie M. Kadyampakeni and Larry W. Duncan

2025–2026 Florida Citrus Production Guide

Boron (B) and Chlorine (Cl) for Citrus Trees

Mongi Zekri and Tom Obreza

Since mineral nutrition is a major factor in maximizing yield of high-quality fruit, understanding the functions of mineral elements, diagnosing nutrient deficiencies, and providing needed fertilizers are essential. This 4-page fact sheet describes and discusses boron (B) and chlorine (Cl) deficiencies, functions, and recommended practices to alleviate nutritional problems.

Nutrition of Florida Citrus Trees, 3 Edition: Chapter 2. Production Areas, Soils, and Land Preparation

Thomas A. Obreza, Mary E. Collins, Kelly Morgan, Jim Graham, and Fernando Alferez

This document is SL460, one of a series of the Department of Soil, Water, and Ecosystem Sciences, UF/IFAS Extension. Original publication date February 2020. Visit the EDIS website at https://edis.ifas.ufl.edu for the currently supported version of this publication.

Nitrogen (N) for Citrus Trees

Mongi Zekri and Tom Obreza

Nitrogen is the key component in mineral fertilizers applied to citrus groves. N has more influence on tree growth, appearance, and fruit production/quality than any other mineral element. Nitrogen affects the absorption and distribution of practically all other elements, and it is particularly important to the tree during flowering and fruit set.

Citrus Fertilizer Management on Calcareous Soils

Thomas A. Obreza, Mongi Zekri, and David V. Calvert

Phosphorus (P) for Citrus Trees

Mongi Zekri and Tom Obreza

This publication is part of a series about understanding nutrient requirements for citrus trees. For the rest of the series, visit https://edis.ifas.ufl.edu/topic_series_citrus_tree_nutrients.

Nutrition of Florida Citrus Trees, 3 Edition: Chapter 1. Introduction

Thomas A. Obreza and Kelly T. Morgan

This publication is part of SL253, Nutrition of Florida Citrus Trees, 3rd Edition. For references, a glossary, and appendices, please refer to the full document at https://edis.ifas.ufl.edu/ss478.

Magnesium (Mg) for Citrus Trees

Mongi Zekri and Tom Obreza

Magnesium deficiency has been a major problem in citrus production. In Florida, Mg deficiency is commonly referred to as “bronzing.” Trees with inadequate Mg may have no symptoms in the spring growth flush, but leaf symptoms develop as the leaves age and the fruit expand and mature in the summer and fall. Magnesium deficiency symptoms occur on mature leaves following the removal of Mg to satisfy fruit requirements.

Nutrition of Florida Citrus Trees, 3 Edition: Chapter 7. Methods of Fertilizer Application

Thomas A. Obreza, Brian J. Boman, Mongi Zekri, and Stephen H. Futch

This publication is part of SL253, Nutrition of Florida Citrus Trees, 3rd Edition. For references, a glossary, and appendices, please refer to the full document at https://edis.ifas.ufl.edu/ss478.

Nutrition of Florida Citrus Trees, 3 Edition: Chapter 11. Special Situations

Thomas A. Obreza, Brian J. Boman, Mongi Zekri, Stephen H. Futch, Lawrence R. Parsons, James J. Ferguson, Rhuanito Ferrarezi, and Arnold Schumann

This publication is part of SL253, Nutrition of Florida Citrus Trees, 3rd Edition. For references, a glossary, and appendices, please refer to the full document at https://edis.ifas.ufl.edu/ss478.

Citrus Soil pH Management

Kelly Morgan

Nutrition of Florida Citrus Trees, 3rd Edition: Chapter 3. General Soil Fertility and Citrus Tree Nutrition

Thomas A. Obreza, Mongi Zekri, and Stephen H. Futch

Calcium (Ca) and Sulfur (S) for Citrus Trees

Mongi Zekri and Tom Obreza

Calcium and sulfur are sometimes called secondary nutrients. This term does not mean that these nutrients play a secondary role in citrus plant growth and development. Ca and S are as essential as N, P, K, Mg, and other nutrients for healthy plant growth. An inadequate supply of Ca and/or S can be a major constraint to crop production and quality.

Potassium (K) for Citrus Trees

Mongi Zekri and Tom Obreza

Citrus fruits remove large amounts of K compared to other nutrients. Potassium moves from leaves to fruit and seeds as they develop. Potassium is necessary for several basic physiological functions such as the formation of sugars and starch, synthesis of proteins, normal cell division and growth, and neutralization of organic acids. Potassium is important in fruit formation and enhances fruit size, flavor, and color. This nutrient also helps to reduce the influence that adverse weather conditions (such as drought, cold, and flooding) have on citrus trees.

Citrus Soil pH Testing Procedures

Kelly Morgan

Nutrition of Florida Citrus Trees, 3 Edition: Chapter 4. Soil and Leaf Tissue Testing

Thomas A. Obreza, Mongi Zekri, and Edward A. Hanlon

Molybdenum (Mo) and Nickel (Ni) for Citrus Trees

Mongi Zekri and Tom Obreza

Since mineral nutrition is a major factor in maximizing yield of high quality fruit, understanding the functions of mineral elements, diagnosing nutrient deficiencies, and providing needed fertilizers are essential. This publication describes and discusses molybdenum (Mo) and nickel (Ni) deficiencies, functions, and recommended practices to alleviate nutritional problems.

Nutrition of Florida Citrus Trees, 3 Edition: Chapter 10. Environmental Issues and Best Management Practices

Brian J. Boman, Thomas A. Obreza, and Kelly T. Morgan

This publication is part of SL253, Nutrition of Florida Citrus Trees, 3rd Edition. For references, a glossary, and appendices, please refer to the full document at https://edis.ifas.ufl.edu/publication/ss478.

Iron (Fe) and Copper (Cu) for Citrus Trees

Mongi Zekri and Tom Obreza

Since mineral nutrition is a major factor in maximizing yield of high-quality fruit, understanding the functions of mineral elements, diagnosing nutrient deficiencies, and providing needed fertilizers are essential. This publication describes and discusses iron (Fe) and copper (Cu) deficiencies, functions, and recommended practices to alleviate nutritional problems.

Nutrition of Florida Citrus Trees, 3 Edition: Chapter 5. Precision Agriculture for Citrus Nutrient Management

Arnold W. Schumann and Edward A. Hanlon

Increasing Efficiency and Reducing Costs of Citrus Nutritional Programs

Mongi Zekri, Thomas Obreza, and Arnold Schumann

Soil and Leaf Tissue Testing for Commercial Citrus Production

Thomas A. Obreza, Mongi Zekri, Edward A. Hanlon, Kelly Morgan, Arnold Schumann, and Robert Rouse

Manganese (Mn) and Zinc (Zn) for Citrus Trees

Mongi Zekri and Tom Obreza

Since mineral nutrition is a major factor in maximizing yield of high-quality fruit, understanding the functions of mineral elements, diagnosing nutrient deficiencies, and providing needed fertilizers are essential. This publication describes and discusses manganese (Mn) and zinc (Zn) deficiencies, functions, and recommended practices to alleviate nutritional problems.