Willie G. Harris

0000-0001-9822-6400

An Indicator for Risk of Phosphorus Loss from Sandy Soils

Vimala D. Nair, Willie G. Harris, Debolina Chakraborty, andDebolina Chakraborty

Sandy soils common in Florida have a low capacity to retain phosphorus (P), increasing the risk of P loss to water resources. This publication presents a practical indicator that combines soil test P with soil P retention properties to better assess the environmental risk of P loss. The indicator helps identify sites where P movement below the root zone is more likely and supports improved fertilizer management decisions. Its use promotes nutrient stewardship while maintaining crop productivity and protecting water quality.

Understanding Soil Phosphorus Storage Capacity

Vimala D. Nair, Willie G. Harris, Debolina Chakraborty, Debolina Chakraborty, andMyrlène Chrysostome

[ABSTRACT]

The Long-Term Contribution of Phosphorus from Agricultural Lands to Lake Okeechobee

Vimala D. Nair, Myrlène Chrysostome, and Willie G. Harris

The purpose of this publication is to explain the role of soil in the long-term contribution of manure phosphorus (P) from agricultural lands to south Florida's Lake Okeechobee. It also addresses the applicability of a recently developed procedure to evaluate a soil's potential to negatively impact water quality through P release from the soil. Revision by Vimala D. Nair, Myrlène Chrysostome, and Willie G. Harris, and published by the UF/IFAS Department of Soil and Water Sciences; 6 pp.

Phosphorus Sources and Risk Potential: Organic and Inorganic Fertilizers

Vimala D. Nair and Willie G. Harris

A UF/IFAS numbered Fact Sheet for Academic and Policy Makers audience(s).

The Potential for Plants to Remove Phosphorus from the Spodic Horizon

Debolina Chakraborty, Vimala D. Nair, Willie G. Harris, and Roy D. Rhue

A UF/IFAS numbered Fact Sheet.

Agricultural Soils of Florida

Rao Mylavarapu, Willie Harris, and George Hochmuth

Parameters for Site-Specific Soil Phosphorus Loss Modeling from Soil Test Data

Biswanath Dari, Vimala D. Nair, andWillie G. Harris

his publication presents predictive equations for estimating the Langmuir (KL) and Freundlich (KF) phosphorus adsorption coefficients from routine soil-test measurements of phosphorus, iron, and aluminum used in Phosphorus Saturation Ratio (PSR) and Soil Phosphorus Storage Capacity (SPSC) calculations. The approach eliminates the need for time-consuming adsorption isotherm experiments and provides a rapid, cost-effective method for obtaining key soil phosphorus retention parameters. These estimates can be incorporated into nutrient transport models to improve site-specific assessment of phosphorus dynamics and phosphorus loss risk from manure- and fertilizer-impacted soils.