Garnett B. Whitehurst

Virginia Tech

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Rory O. Maguire

Virginia Tech

M. M. Alley

Virginia Tech

C. L. Edwards

Kansas State University

Wade E. Thomason

Virginia Tech

David Lee Holshouser

Virginia Tech

Abigail E. Baxter

Northwest Irrigation and Soils Research Laboratory

Mark S. Reiter

Virginia Tech

Cooperative Institutions

Virginia Tech

Virginia Cooperative Extension

Carroll College

Consejo Superior de Investigaciones Científicas

Universitat de Miguel Hernández d'Elx

Tidewater (United States)

North Central State College

North Carolina State University

Research Triangle Park Foundation

Southern Research Institute

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Plant-Available Phosphorus after Application of Synthetic Chelating Agents

Communications in Soil Science and Plant Analysis (2016)

C. L. Edwards Rory O. Maguire M. M. Alley Wade E. Thomason Garnett B. Whitehurst

Fertilizer phosphorus (P) can become immobilized in acidic soils through bonds with iron (Fe) and aluminum (Al). Two chelating agents, ethylenediamine tetraacetic acid disodium salt (EDTA) and hydroxyethyl ethylenediamine triacetic acid (HEEDTA), were tested in a greenhouse study for efficiency at increasing plant-available P to corn (Zea mays L.). Fertilizer P was added with or without chelate to the center of pots, simulating a starter band of P. Without the presence of chelates, biomass above and below ground increased linearly as P fertilizer rates increased at 0, 9.6, 19.3, 28.9, and 38.5 kg P ha−1. Applications of EDTA and HEEDTA did not significantly increase water-soluble P (WSP), Mehlich 1 P, and Mehlich 3 P compared to soils without chelates. Applications of EDTA increased P uptake in the belowground biomass. Despite previous research showing that chelates increased WSP in soils, a decrease in P sorption was not observed with the additions of chelating agents to soils.

Ethylene diamine

10.1080/00103624.2015.1122796

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Novel Fertilizer as an Alternative for Supplying Manganese and Boron to Soybeans

Communications in Soil Science and Plant Analysis (2018)

Abigail E. Baxter Rory O. Maguire Garnett B. Whitehurst David Lee Holshouser Mark S. Reiter

Soybean (Glycine max) commonly experience Mn deficiencies in the coarse-textured soils of Coastal Plain Virginia, especially under high pH conditions. The objective of this study was to investigate the ability of a novel coated fertilizer to provide Mn and B to soybeans in soils where Mn deficiency is common and B deficiency, although far less common than with Mn, is possible. A 60-d greenhouse experiment was conducted with three treatments: control, uncoated KCl, and Mn +B coated KCl applied to Bojac and Dragston sandy loams. Soil and whole plant tissue samples were collected throughout the experiment. Bojac and Dragston soils treated with the coated KCl contained 12.0 mg kg−1 and 15.8 mg kg−1 more Mehlich 1 – Mn, 21.7 mg kg−1 and 23.0 mg kg−1 more Mehlich 3 Mn, and 4.5 mg kg−1 and 4.6 mg kg−1 CaCl2 – Mn than the control and uncoated KCl, respectively. Coated KCl increased above ground tissue Mn by 42.9 mg kg−1 compared to the control and the uncoated KCl treatments in the Bojac soil, while the Dragston soil showed no significant differences in Mn tissue concentration between treatments. Above ground tissue, Mn was much lower in the Dragston soil than the Bojac, probably due to greater organic matter which chelates Mn keeping it less plant available. Boron concentrations did not differ in plant tissue or soil, regardless of the extraction method. Results indicate that the coated KCl product could consistently provide increased Mn concentration in acidic sandy soils despite varying levels of organic matter, but is not effective for B.

Plant tissue

10.1080/00103624.2018.1547393

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Using Synthetic Chelating Agents to Decrease Phosphorus Binding in Soils

Soil Science (2016)

C. L. Edwards Rory O. Maguire Garnett B. Whitehurst Wade E. Thomason M. M. Alley

Most acid soils have a high capacity to bind phosphorus (P) strongly on iron (Fe) and aluminum (Al) hydroxides, resulting in low P fertilizer use efficiency. Organic chelating agents form strong bonds with metals in soil and may reduce P binding with Fe and Al and increase fertilizer P use efficiency. Ethylenediamine tetraacetic acid (EDTA), hydroxyethyl ethylenediamine triacetic acid (HEEDTA), gluconic acid, and citric acid were tested to determine their influence on water-soluble P (WSP), Mehlich-1 P, and Mehlich-3 P in a loam and sand fertilized with P and incubated for 49 days. Soil P sorption capacity (PSC) was estimated from an oxalate extraction of Fe and Al, and chelates were applied at rates of 90% of the PSC. EDTA and HEEDTA were also applied at 0, 30, 60, 90, 120, and 150% PSC to produce a rate response curve for WSP in a second soil incubation. The EDTA, HEEDTA, and citric acid significantly (P < 0.05) reduced P sorption in the loam and sand when measured by WSP. In soils without P fertilizer added, EDTA and HEEDTA resulted in a significant increase in WSP concentrations, as well as increased concentrations of Mehlich-1 P and Mehlich-3 P. With increasing chelation rates of EDTA and HEEDTA, there was a linear increase in WSP for both soils, indicating higher rates were most effective at decreasing P sorption. The application of chelating agents, with and without P fertilizer, could potentially increase plant availability of P, therefore reducing P fertilizer.

Ethylene diamine

10.1097/ss.0000000000000171

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Citations (10)