Obreza, Thomas Anthony

0000-0003-0579-7410

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

Mongi Zekri and Tom Obreza

Citrus BMP Implementation in Florida's Gulf Citrus Production Area: Pesticides

S. Shukla, R. E. Rouse, S. S. Shukla, E. A. Hanlon, K. Portier, and T. A. Obreza

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

Citrus BMP Implementation in Florida's Gulf Citrus Production Area: Nutrients

S. Shukla, R. E. Rouse, S. S. Shukla, E. A. Hanlon, K. Portier, and T. A. Obreza

Citrus Fertilizer Management on Calcareous Soils

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

Onsite Sewage Treatment and Disposal Systems: Phosphorus

Mary Lusk, Gurpal S. Toor, and Tom Obreza

Water and Nitrogen BMPs for Tomato and Watermelon: Water Quality and Economics

Sanjay Shukla, Gregory S. Hendricks, Fritz M. Roka, and Thomas A. Obreza

Groundwater Nitrogen: Behavior in Flatwoods and Gravel Soils Using Organic Amendments for Vegetable Production

Sanjay Shukla, Edward A. Hanlon, Fouad H. Jaber, Peter J. Stoffella, Thomas A. Obreza, and Monica Ozores-Hampton

Onsite Sewage Treatment and Disposal Systems: Bacteria and Protozoa

Mary Lusk, Gurpal S. Toor, and Tom Obreza

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.

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

Preparing and Storing an Emergency Safe Drinking Water Supply

Shuchi Shukla, Thomas Obreza and Andrea Albertin

The purpose of this fact sheet is to emphasize the importance of having a personal safe drinking water supply during an emergency and to describe the steps that Florida's citizens should take to prepare and store drinking water.

Onsite Sewage Treatment and Disposal Systems: Viruses

Mary Lusk, Gurpal S. Toor, and Thomas Obreza

Citrus Irrigation Management

Davie Kadyampakeni, Kelly Morgan, Mongi Zekri, Rhuanito Ferrarezi, Arnold Schumann, and Thomas Obreza

The chapter on irrigation management of citrus is largely taken from guidelines provided in SL253 on trees prior to Huanglongbing (HLB) prevalent conditions. A section has been added to cover recent findings on water use of trees affected by HLB and the impact this would have on the irrigation management considerations. This document is SL446, one of a series of the Soil and Water Sciences Department, UF/IFAS Extension. Original publication date September 2017.

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.

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

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.

Irrigation Management of HLB-Affected Trees

Davie Kadyampakeni, Kelly Morgan, Mongi Zekri, Rhuanito Ferrarezi, Arnold Schumann, and Thomas A. Obreza

The chapter on irrigation management of citrus is largely taken from guidelines on trees prior to citrus greening provided in Chapter 9 of SL253 (https://edis.ifas.ufl.edu/ss478). A section has been added to cover recent findings on water use of trees affected by citrus greening and the impact this would have on irrigation management considerations. This document is SL445, one of a series of the Department of Soil and Water Sciences, UF/IFAS Extension. Original publication date October 2017.

Micronutrient Deficiencies in Citrus: Boron, Copper, and Molybdenum

Mongi Zekri and Thomas A. Obreza

Micronutrient Deficiencies in Citrus: Iron, Zinc, and Manganese

Mongi Zekri and Thomas A. Obreza

Macronutrient Deficiencies in Citrus: Nitrogen, Phosphorus, and Potassium

Mongi Zekri and Thomas A. Obreza

Crop Water Use and Irrigation Scheduling Guide for North Florida

Vivek Sharma, Charles Barrett, De Broughton, and Thomas Obreza

Potassium (K) 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.

Onsite Sewage Treatment and Disposal Systems: Nitrogen

Gurpal S. Toor, Mary Lusk, and Tom Obreza

Macronutrient Deficiencies in Citrus: Calcium, Magnesium, and Sulfur

Mongi Zekri and Thomas A. Obreza

Onsite Sewage Treatment and Disposal Systems: An Overview

Gurpal S. Toor, Mary Lusk, and Tom Obreza

Diagnostic Nutrient Testing for Commercial Citrus in Florida

Rao Mylavarapu, Kelley Hines and Thomas Obreza

How to Characterize Soil Variability in Florida Citrus Groves as It Relates to Tree Growth and Yield

Kirandeep K. Mann, Arnold W. Schumann, Thomas A. Obreza, Willie G. Harris, and Jerry B. Sartain

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 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

Watersheds of Florida: Understanding a Watershed Approach to Water Management

Rao Mylavarapu, Thomas Obreza, and Greg Means

Plant Nutrients for Citrus Trees

Mongi Zekri and Thomas A. Obreza

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

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.

Extraction of Soil Nutrients Using Mehlich-3 Reagent for Acid-Mineral Soils of Florida

Rao Mylavarapu, Tom Obreza, Kelly Morgan, George Hochmuth, Vimala Nair, and Alan Wright

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.

Increasing Efficiency and Reducing Costs of Citrus Nutritional Programs

Mongi Zekri, Thomas Obreza, and Arnold Schumann

Onsite Sewage Treatment and Disposal Systems: Trace Organic Chemicals

Gurpal S. Toor, Mary Lusk, and Tom Obreza

Soil and Leaf Tissue Testing for Commercial Citrus Production

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

Some Practical Matters Related to Riviera Soil, Depth to Clay, Water Table, Soil Organic Matter, and Swingle Citrumelo Root Systems

Bill Castle, Mace Bauer, Brian Boman and Tom Obreza

Citrus BMP Implementation in Florida's Gulf Citrus Production Area: Water, Sediment, and Aquatic Weeds

S. Shukla, R. E. Rouse, S. S. Shukla, E. A. Hanlon, K. Portier, and T. A. Obreza

Irrigation, Nutrition, and Citrus Fruit Quality

Mongi Zekri, Thomas A. Obreza, Robert Koo, and Fernando M. Alferez

Manganese (Mn) and Zinc (Zn) 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.

2024–2025 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

2024–2025 Florida Citrus Production Guide

2024–2025 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

2024–2025 Florida Citrus Production Guide

2024–2025 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

2024–2025 Florida Citrus Production Guide

Dealing with Iron and Other Micro-Irrigation Plugging Problems

Tom Obreza, Ed Hanlon, and Mongi Zekri

A UF/IFAS numbered Fact Sheet.

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

UF/IFAS Nutrient Management Recommendation Series: Carrot

Robert Hochmuth, Vivek Sharma, Thomas Obreza, and Rao Mylavarapu

Nutrient management recommendations for carrot are described according to the standard UF/IFAS recommendation format of 1) a calibrated soil test result; 2) target soil pH; 3) the "4Rs" of fertilizer management: rate, timing, placement, and source; and 4) water management factors.

UF/IFAS Nutrient Management Recommendation Series: Strawberry

Shinsuke Agehara, Thomas Obreza, and Rao Mylavarapu

Nutrient management recommendations for strawberry are described according to the standard UF/IFAS recommendation format of 1) a calibrated soil test result; 2) target soil pH; 3) the "4Rs" of fertilizer management: rate, timing, placement, and source; and 4) water management factors.

UF/IFAS Nutrient Management Recommendation Series: Hemp

Zachary Brym, Lakesh Sharma, Hardeep Singh, Thomas Obreza, and Rao Mylavarapu

Nutrient management recommendations for hemp are described according to the standard UF/IFAS recommendation format of 1) a calibrated soil test result; 2) target soil pH; 3) the "4Rs" of fertilizer management: rate, timing, placement, and source; and 4) water management factors.

UF/IFAS Nutrient Management Recommendation Series: Watermelon

Robert Hochmuth, Mark Warren, Tatiana Sanchez-Jones, Craig Frey, Thomas Obreza, and Rao Mylavarapu

Nutrient management recommendations for watermelon are described according to the standard UF/IFAS recommendation format of 1) a calibrated soil test result; 2) target soil pH; 3) the "4Rs" of fertilizer management: rate, timing, placement, and source; and 4) water management factors.

When to Lime Soil and Liming Products Available in Florida

Lakesh K. Sharma, Hardeep Singh, and Thomas A. Obreza

It is essential to maintain the desired pH of the soil in order to cultivate plants that are robust and prolific. This axiom is true regardless of whether one is growing crops or plants in an agricultural or urban setting. Because it has a direct impact on the availability of essential plant nutrients, soil pH, also noted as the “soil reaction,” is a crucial factor to consider. The internet is rife with misleading information describing the concept of soil acidity and alkalinity as well as how the soil reaction affects plant growth. If you want to change the pH of Florida soil, it is not advisable to use the information found on the internet, as different types of soil require different lime quantities, types, and application techniques. In contrast, some soils may require elemental sulfur application to lower the soil pH. In Florida, recommendations to change soil pH should come from a local expert.