Soil Health and Sustainability

An Introduction to Biochars and Their Uses in Agriculture

Rao Mylavarapu, Vimala Nair, and Kelly Morgan

Tools for Evaluating Soil Health

Jehangir H. Bhadha, Jay Capasso, Robert S. Schindelbeck, and Allan R. Bacon

The Importance of Soil Health for Residential Landscapes

Sally Scalera, Alexander J. Reisinger, and Mary Lusk

Four Conservation Agricultural Practices to Manage Organic Soil Loss

Noel Manirakiza, Suraj Melkani, Xue Bai, Yang Lin, and Jehangir H. Bhadha

This factsheet highlights four common conservation agricultural practices that can be implemented to limit organic soil loss. Organic soils (Histosol) are the most important soils that play a crucial role in mitigating global warming by acting as a repository for terrestrial carbon. Within south Florida, nearly 450,000 acres of Histosols are at risk from soil loss via oxidation, and growers would like to know the best ways to manage their soils to limit soil loss. Using the USDA-NRCS framework, we have identified four conservation practices—cover cropping, crop rotation, organic amendments, and conservation tillage—that can be implemented to address organic matter loss within the region.

Managing Cover Crops for Improved Soil Health

R. Seepaul, S. George, J. Love, D. W. Wright, C. Mackowiak, and A. Blount

This publication aims to help growers and researchers understand the role of cover crops in improving soil health. The document provides recommendations on managing cover crops and describes the benefits of growing cover crops. Written by R. Seepaul, S. George, J. Love, D. W. Wright, C. Mackowiak, and A. Blount, and published by the UF/IFAS Agronomy Department, revised January 2023.

Integrating Rhizoma Perennial Peanut into Bahiagrass Pastures Enhances Beneficial Soil Microbes in Florida

Hui-Ling Liao and Adesuwa S. Erhunmwunse

Soil microorganisms, including soil bacteria and fungi, play important roles in pasture systems. They contribute to enhanced soil structure, nutrient cycling, and plant resilience. This publication discusses effects of bahiagrass and rhizoma perennial peanut integration on soil microbial diversity. Written by Hui-Ling Liao and Adesuwa S. Erhunmwunse, and published by the UF/IFAS Department of Agronomy, July 2024.

The Plant-Growth-Promoting Fungus, Mortierella elongata: Its Biology, Ecological Distribution, and Activities Promoting Plant Growth

Hui-Ling Liao

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

Biology, Ecology, and Benefits of Ectomycorrhizal Fungi in Natural and Managed Forest Ecosystems

Holly Andres, Kaile Zhang, and Hui-Ling (Sunny) Liao

Ectomycorrhizal fungi (EMF) form symbiotic relationships with approximately 60% of trees and woody plants among temperate and boreal forests. EMF also serve as the primary symbionts in subtropical and tropical forests, particularly in conifer forests, including those in Florida's climate. These fungi influence the global carbon, nitrogen, and phosphorus cycles, sequestering or supplying these elements as necessary for ecosystem processes and resilience. However, EMF are susceptible to environmental stressors and management practices, including fertilizers, fungicides, and mechanical disturbances. This publication aims to provide general knowledge to the general public on the biology and ecological functions of EMF in natural and managed forest ecosystems. By understanding the role and benefits of EMF in these environments, forest managers, tree nursery operators, and timber industry stakeholders can gain valuable insights for incorporating EMF into their management practices.

Soil Health and Fertility of Florida-Friendly Edible Landscapes

Tina McIntyre, Rachel Gutner, Tiare Silvasy, and Esen Momol

Maintaining an edible landscape using the nine Florida-Friendly Landscaping™ principles provides a practical approach to food production for homeowners and landscaping consultants. Integrating practical pest management strategies, addressing nutrient deficiencies, proper pruning techniques, timely harvesting, and mulching are all practices that contribute to a healthy landscape. This new 8-page publication of the UF/IFAS Environmental Horticulture Department provides homeowners with key Florida-Friendly Landscaping™ concepts and tips to enhance the health and fertility of soils while protecting the environment. Healthy soils result in improved production yields, beautiful landscapes, and a more resilient environment. Written by Tina McIntyre, Rachel Gutner, Tiare Silvasy, and Esen Momol.

Rhizosphere Microbes and the Roles They Play in Crop Production and Soil Health

Hui-Ling Liao

Each gram of rich soil can harbor 100 million to a billion microorganisms, meaning every inch of our soil is alive (Raynaud and Nunan 2014) (Fig. 1). These underground organisms keep soil healthy. Balancing the community of microbes can benefit plant yield, plant health, and soil sustainability. While it is recognized that many soil microbes perform key roles in crop productivity, the importance of these underground activities is easily overlooked because of their small size. By focusing on a specific group of microbes living on or near plant roots, this publication provides understanding for these questions: Who are these microbes and how do they improve plant and soil health?

Improving Biological Nitrogen Fixation to Improve Soil Nutrient Status

Lakesh K. Sharma, Ayush K. Sharma, Andrew Ogram, and Hardeep Singh

The chemical reduction of atmospheric nitrogen (N2) by hydrogen for incorporation into plant tissue is known as N fixation. Along with the carbon, N has a role in maintaining the optimum source and sink ratio, which ensures crop growth and biological yield. N is available in great concentration (˜80%) in the atmosphere in N2 form, but plants cannot absorb or uptake N in N2 form. N fertilizers are available in straight, mixed, and nano and liquid fertilizers. These approaches are not enough, though, to maximize N use efficiency to 100%. A significant amount of nitrogen is still lost in air and water bodies, leading to multiple negative impacts to the environment. Therefore, N fixation through the crop itself is a practical approach to reduce the use of synthetic nitrogen and enhance the sustainability of the food production systems. This publication discusses various methods for BNF and its importance to the sustainability of crop production.

Biology, Ecology, and Benefits of Arbuscular Mycorrhizal Fungi in Agricultural Ecosystems

Holly Andres, Hui-Ling (Sunny) Liao, and Kaile Zhang

Arbuscular mycorrhizal fungi, as symbionts to host plants, play a pivotal role in regulating plant nutrient uptake and maintaining soil health. As approximately 80%-90% of terrestrial plants are colonized by mycorrhizal fungi, this fungal group significantly contributes to the overall yield and functions in crop production. This publication provides updated general knowledge on the biology and ecological functions of the most common types of mycorrhizal fungi. These fungi are highly sensitive to environmental stressors and management practices, such as the application of phosphorus and nitrogen fertilizers, as well as fungicides. An enhanced understanding of mycorrhizal fungi can raise awareness among growers, prompting them to consider mycorrhizal fungal activities when managing their farms. Moreover, it can improve the general public's knowledge of the role mycorrhizal fungi play in natural terrestrial ecosystems, including agricultural and forest ecosystems.

The Importance of Sulfur for Florida Agricultural Production

Lakesh K. Sharma, Lincoln Zotarelli, and Christian T. Christensen

Intended for Extension clients, this publication highlights the importance of sulfur in row and vegetable crop production systems in Florida, such as its use in pesticides and fertilizers. Additionally, the publication provides insights into the perspective of the Environmental Protection Agency (EPA) on sulfur in naturally occurring aquatic systems. This publication's target audience is agricultural producers, Extension agents, crop consultants, representatives of the fertilizer industry, state and local agencies, students, instructors, researchers, and interested Florida citizens.

Design and Construction of a Constant Head Infiltrometer

Mahesh Bashyal, Michael J. Mulvaney, Eban Z. Bean, and Hardeep Singh

A UF/IFAS numbered peer reviewed Fact Sheet. in support of UF/IFAS Extension program: Farm Economics, entrepreneurship, and management