Gelton G. F. Guimarães

Gelton G. F. Guimarães
Empresa de Pesquisa Agropecuária e Extensão Rural de Santa Catarina - Epagri | EPAGRI · Estação Experimental de Itajaí

PhD

About

35
Publications
5,352
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571
Citations
Introduction
I have been working on soil fertility and plant nutrition, focusing on development and evaluation of special fertilizers. Experience in evaluation of controlled activation fertilizers and development of new strategies to increase the solubility of nutrient sources.
Additional affiliations
August 2015 - January 2018
Brazilian Agricultural Research Corporation (EMBRAPA)
Position
  • PostDoc Position
Education
August 2011 - July 2015
Universidade Federal de Viçosa (UFV)
Field of study
  • Soil Science and Plant Nutrition

Publications

Publications (35)
Article
Agricultural output needs significant increases to feed the growing population. Fertilizers are essential for plant production systems, with nitrogen (N) being the most limiting nutrient for plant growth. It is commonly supplied to crops as urea. Still, due to volatilization, up to 50 % of the total N application is lost. Slow or controlled release...
Article
Up to 80% of the applied phosphorus via fertilizers can be lost to the environment through adsorption and precipitation reactions. Although nanoparticulated fertilizers can improve phosphate efficiency, they should be kept with no agglomeration, e.g., by dispersing urea (nanocomposite), which also provides nitrogen for plants. Thus, we evaluated th...
Article
Full-text available
In face of the alarming world population growth predictions and its threat to food security, the development of sustainable fertilizer alternatives is urgent. Moreover, fertilizer performance should be assessed not only in terms of yield but also in root system development, as it impacts soil fertility and crop productivity. Fertilizers containing...
Article
Full-text available
The manufacture of asbestos materials has been banished worldwide due to their toxicity, but discarding the existing wastes remains a challenge. We investigated an alternative mechanochemical method to treat asbestos-cement materials by loading them with potassium and phosphorus from KH2PO4 during the milling process to obtain a product used as lim...
Preprint
Full-text available
In face of the alarming world population growth predictions and its threat to food security, the development of sustainable fertilizer alternatives is urgent. Moreover, fertilizer performance should be assessed not only in terms of yield but also root system development, as it impacts soil fertility and crop productivity. Fertilizers containing a p...
Article
Vendavais provocados por tempestades e passagem de ciclone em Santa Catarina causaram sérios danos em todas as regiões produtoras de banana do estado. A análise detalhada dos danos em cada unidade produtiva indicará as práticas de manejo mais pertinentes para cada caso. O objetivo deste informativo técnico é destacar as principais recomendações de...
Article
Full-text available
Nitrogen fertilization has been a critical factor for high crop productivity, where urea is currently the most used N source due to its high concentration and affordability. Nevertheless, urea fast solubilization leads to frequent losses and lower agronomic efficiency. The modification of urea structure by condensation with formaldehyde has been pr...
Article
Full-text available
Intensive fertilization has been required to provide nutrients for plant growth under the current agricultural practices being applied to meet the global food demands. Micronutrients such as zinc, manganese, and copper are required in small quantities when compared to macronutrients (such as nitrogen, phosphorus and potassium), but they are essenti...
Article
Since the past century, fertilizers have been significantly contributing to the increase in food production. Currently, the fertilizer sector's technological advances are crucial to providing food for more than 7.7 billion people. However, factors related to the low fertilizers' agronomic efficiency limit the food supply. The conventional fertiliza...
Article
The development of smart and eco-friendly fertilizers is pivotal to guarantee food security sustainably. Phosphate rock and struvite are promising alternatives for P fertilization; nevertheless, the solubility of these sources is a challenge for consistent use efficiency. Here, we propose using a polysulfide obtained via inverse vulcanization as a...
Preprint
Full-text available
Nitrogen fertilization has been a critical factor for high crop productivity, where urea is currently the most used N source due to its high concentration and affordability. Nevertheless, urea fast solubilization leads to frequent losses and lower agronomic efficiency. The modification of urea structure by condensation with formaldehyde has been pr...
Article
Food security is one of the biggest challenges for the next few decades, especially with the accelerated population growth rates. Therefore, achieving a better nutrient use efficiency is crucial to enhance crop yields and productivity, which depend directly on how macronutrients are supplied. It is notably complex because fertilizers are often appl...
Article
The volatilization of nitrogen (N) in the form of greenhouse gases is the most significant environmental impact associated with fertilizer use. Losses of N may exceed 50 % of the quantity applied, especially when the nitrogen source is urea. This work describes an overcoating system for urea granules, based on starch (from maize or cassava crops) a...
Article
Full-text available
Considerable attention has been given to the development of new nutritional management strategies that can contribute to banana production be overestimated. The present study was motivated by the possibility that fertilizer application in front of the daughter plant might be more effective than application to the total banana production area. This...
Article
Full-text available
Urea is a common non-protein supplement used in ruminant feed; however, excessive consumption may lead to poisoning by NH3. Although the slow release of urea into the rumen has shown to be an essential aspect for ruminant feed, to date only a few studies have addressed this matter. In this study we examined the influence of five different NH3-N slo...
Article
Full-text available
Although herbicides are essential to ensuring high crop yields, the development of sustainable formulations remains a challenge in modern agriculture. Herbicide use is typically affected by the poor water solubility of the compounds they contain, and so they are often applied at very high doses that exceed those needed for weed control (WC). Highly...
Article
Full-text available
Polymer coatings are used to control the rate of release of plant available nutrients from fertilizers as well as to reduce nutrient losses such as ammonia (NH 3) volatilization. Although the literature presents several examples of materials used to coat urea, little is known about nitrogen (N) release properties such as the mechanism involved and...
Article
Full-text available
Recent research has shown the need for an in-depth knowledge of zinc biofortification of cereal and oilseed grains due to its importance to human nutrition. However, little is known about the Zn dynamics in plant–soil system. In this work, we evaluated the effect of soil-applied Zn on the absorption, translocation, and compartmentalization of Zn in...
Technical Report
A banana é uma fruta de grande importância econômica e social no mundo, sendo fonte de alimento e renda para milhões de pessoas. O Brasil é um dos principais produtores mundiais e o estado de Santa Catarina está entre os quatro maiores produtores nacionais. O aumento da qualidade e da quantidade da produção dessa fruta passa essencialmente pela uti...
Article
Herein we describe a new fertilizer delivery system made of a thermoplastic starch composite used to control the release of nitrogen in greenhouse trials. The innovative approach in this work is to use a natural matrix to disperse the N source using one extrusion processing step that is easily scalable. The extrudate was formed into a continuous st...
Article
Sulfur deficiency in soils has become an increasing concern over the past decades. Despite elemental sulfur (S 8 ) vast utilization as a commercial fertilizer, S 8 has to be biologically oxidized for plant assimilation, drastically limiting its efficiency. Therefore, we propose a new fertilizer in which S 8 structure is more accessible to oxidizing...
Article
Full-text available
Functionalized charcoal (CHox) incorporated into urea is known for its ability to reduce NH3 volatilization and increase agronomic efficiency. However, it is important to optimize the functionalization process and to elucidate its relationship with the physicochemical properties of CHox for N supply. Thus, charcoal obtained from eucalyptus wood was...
Article
Full-text available
High copper (Cu) and zinc (Zn) contents in soil can cause phytotoxicity to plants and contaminate surface and groundwater, with negative effects on agriculture and the environment. Functionalized charcoal (OCh) has high cation exchange capacity (CEC) and the ability to adsorb Cu and Zn and control their availability in the soil and water. An adsorp...
Article
The use of natural phosphate rock as a source of phosphorus for plant growth is considered more environmentally friendly, compared to conventional chemical fertilizers. However, the very low solubility of the phosphate present in natural rocks limits its practical application. To overcome this limitation, a composite was developed based on the disp...
Article
Sulfur is currently a bottleneck for agronomic productivity. Many products are based on the application of elemental sulfur (S°), but the ability of the soil to oxidize them is variable and dependent on the presence of oxidizing microorganisms. In this work, a composite was designed based on a matrix of So prepared by low-temperature extrusion, rei...
Article
Full-text available
Nitrogen loss through NH3 volatilization is a primary concern for urea as fertilizer due its fast hydrolysis by soil urease. To minimize this problem herein we developed a partially-polymerized urea–formaldehyde granule as a slow-release fertilizer, by melt stage process as a viable route for large-scale production. In this product the unreacted ur...
Article
A route is proposed to produce a hydrotalcite-like LDH ([Mg-Al]-LDH) structure for phosphate fertilization. The mechanism of controlled phosphate release from the structure was investigated. The preparation strategy resulted in a phosphorus (P) content of around 40 mg.g⁻¹ LDH, which was higher than previously reported for related fertilizers. The r...
Article
The rapid hydrolysis of urea applied to soil surface causes high rates of NH3 volatilization, leading to adverse environmental impacts and decreased uptake of N by crops. One approach that can be used to improve the efficiency of urea use involves strategies to control its release, such as the coating of granules with polymers. However, the effecti...
Article
The coating of fertilizers with polymers is an acknowledged strategy for controlling the release of nutrients and their availability in soil. However, its effectiveness in the case of soluble phosphate fertilizers is still uncertain, and information is lacking concerning the chemical properties and structures of such coatings. Here, an oil-based hy...
Article
Full-text available
Developing efficient crop fertilization practices has become more and more important due to the ever-increasing global demand for food production. One approach to improving the efficiency of phosphate and urea fertilization is to improve their interaction through nanocomposites that are able to control the release of urea and P in the soil. Nanocom...
Article
Charcoal-based amendments have a potential use in controlling NH3 volatilization from urea fertilization, owing to a high cation-exchange capacity (CEC) that enhances the retention of NH $ _4^+ $. An incubation study was conducted to evaluate the potential of oxidized charcoal (OCh) for controlling soil transformations of urea-N, in comparison to u...
Article
Volatilization losses reduce the efficiency of surface-applied urea for crop N uptake, and can be controlled using urease inhibitors to retard hydrolysis or by the presence of other amendments that enhance retention of NH4+ formed by urea hydrolysis. A greenhouse study was conducted to evaluate the effectiveness of oxidized charcoal (OCh; 150 g kg−...
Article
Full-text available
Loss of N through volatilization of ammonia is the main limitation for agricultural use of urea. The aim of this study was to evaluate the volatilization of NH3 from urea granulated (Ug) or urea coated (Ur) with two oxidized charcoals produced by the oxidation of eucalyptus charcoal with 4.0 mol L-1 HNO3, followed by the post-treatment with NaOH (C...
Article
Full-text available
Urea is the most consumed nitrogen fertilizer in the world. However, its agronomic and economic efficiency is reduced by the volatilization of NH3, which can reach 78 % of the applied nitrogen. The coating of urea granules with acidic compounds obtained by charcoal oxidation has the potential to reduce the volatilization, due to the acidic characte...

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Project (1)
Project
Nanotechnology has contributed greatly to the development of new materials or new applications, aimed at consolidating innovative products and processes in various fields of production technology, including agribusiness, which strongly contributes to the Brazilian food security and economic. In this sense, interest new materials possibly obtained from agricultural products, as well as those for the development of new processes and products of agricultural base. Of these new materials applied, many - as organic thin films, immobilized enzymes on surfaces of metal nanoparticles, meso and nanoporous systems, among others - are intended for multiple applications. This project aims at exploring advanced lines of research in nanotechnology, among those not clearly identified in Agronano Network project in order to incorporate new knowledge, prepare new avenues of research and to ensure continuity of research in nanotechnology applied Agribusiness in international standards of excellence.