
Andrés GarcíaFederal Rural University of Rio de Janeiro | UFRRJ · Department of Soils
Andrés García
PhD. Professor at UFRRJ
Biological Soil Chemistry; Structure-Property-Function; Plant Defense Metabolism, Characterization, Chemometrics
About
128
Publications
22,419
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
1,913
Citations
Publications
Publications (128)
Background
The incorporation of circular economy into agricultural processes is necessary to improve the efficiency of agronomic practices in the future. The biomass of macroalgae as well as humic substances is sustainable options for stimulating the efficient use of nutrients in plants. This study aimed to evaluate the modes of action of a potenti...
Nitrogen (N) is an essential nutrient for plants. Nitrate is often the main inorganic N form absorbed, and amino acids are the predominant organic N form transported in most plant species. Amino acid transporters (AATs) mediate the distribution of amino acids between organs, and any disturbance in this process can cause changes in crop development....
Humified organic matter has been shown to decrease Pb toxicity in plants. However, there are still gaps in our understanding of the mechanism by which this phenomenon occurs. In this study, we aimed to assess the ability of humic substances (HSs), humic acids (HAs), and fulvic acids (FAs) to enhance defense mechanisms in rice plants under lead (Pb)...
The red alga Kappaphycus alvarezii (Rhodophyta) is one of the most cultivated species in the world. Extracts obtained from Kappaphycus (KAlv-sap) have been shown to promote plant growth as well as defense against abiotic stresses. The present study aimed to examine the regulation of photosynthesis and the genetic and metabolic mechanisms resulting...
Objective: The aim of this study was to evaluate the effects of Histosols management on soil organic matter (SOM) characteristics. Theoretical framework: Histosols are soils that provide ecosystem services, especially carbon stocks. Among the environments in which these soils are formed, peatlands stand out. The conversion of these areas into agric...
This study aimed to investigate the influence of chemical and structural characteristics of biochar on the development of rice plants grown in fragile sandy soil. An experiment was carried out in pots with the application of four doses (0 ton ha−1; 10 ton ha−1; 20 ton ha−1; 30 ton ha−1) of eucalyptus biochar from four artisanal sources (B1, B2, B3,...
Nitrogen (N) deficiency is abiotic stress to which rice plants may be frequently exposed. The aim was to investigate whether the exposure of rice plants to complete cultivation cycles with low-N stress results in plants better adapted to this condition. The rice plants, varieties Manteiga and Piaui, were grown for three generations under the follow...
This study aimed to elucidate the formation process of humic substances (HS) during poultry litter (PL) composting and its influence on the structural characteristic of the formed compost. Fresh PL was composted, and samples were collected at seven time points (0, 7, 21, 30, 60, 90, and 120 days). At each time point, the compost and its humic fract...
Agriculture is responsible for consuming the largest amount of water in the world. Water availability is the environmental factor that most limits the sustainability of agricultural systems. The adoption of sustainable technologies that improve plant water use efficiency has become increasingly important in modern agriculture. Humic acids (HA) acts...
Salinity induces salt uptake by plant cells, which hinders plant growth and results in decreased agronomic crop yields. Humic substances (HSs) have been shown to be ecological agricultural alternatives to stimulate plant development under both normal and abiotic stress conditions. At the same time, arbuscular mycorrhizal fungi (AMF) provide nutrien...
As substâncias húmicas (SH) contribuem para o crescimento e o desenvolvimento de diferentes espécies vegetais. Existem relatos de efeitos positivos das SH sobre o desenvolvimento de várias espécies vegetais importantes para a produção de alimentos, fibras e energia (GUO et al., 2019). O efeito positivo da aplicação de SH na promoção do crescimento...
The Global Soil Partnership with the Food and Agriculture Organization of the United Nations (FAO) defines Chernozem, Kastanozem, and Phaeozems as black soils characterized by high natural fertility and dark surface horizons enriched in organic matter. Chernozems and Kastanozems are also characterized by carbonate accumulation. In the Araripe basin...
The structure of humic substances (HSs) and the humification process are critical topics for understanding the dynamics of carbon on the planet. This study aimed to assess the structural patterns of 80 humic acid (HA) samples isolated from different soils, namely, Histosols, Ferralsols, Cambisols, Mollisols, Planosols and vermicompost, by spectrosc...
Humic substances stimulate the growth and development of plants, inducing oxidative regulation at the cellular level in their interaction with the root surface. This promotes a state of "eustress" that results in root growth and protection of plants against abiotic stress. This study aimed to evaluate the effect of the application of humic acids (H...
Humic acids (HA) stimulate the growth of several plant species by regulating their hormonal and redox metabolisms. Nevertheless, studies on their relationship with the plant-associated microbiota are almost nonexistent. Here, we hypothesized that the HA effect occurs in parallel with the regulation of the plant-associated bacterial community. Rice...
Biochar production has increased in recent years due to its wide applicability as alternative fuels, environmental remediation, wastewater treatment and input for agricultural applications. Biochar has characteristics that are mainly driven by the parameters implemented in the production process, such as pyrolysis temperature and the origin of biom...
Throughout the Amazon region, dark-colored soils with increased fertility are identified and referred as Amazonian Dark Earths (ADE). These unique soils are characterized by an anthropic surface horizon with dark colors, presence of charcoal and artifacts, in contrast with surrounding non-ADE soils. The ADEs show extraordinary properties such as th...
Urban trees positively influence the quality of life in cities, but they need to be pruned regularly, generating a large amount of solid urban waste. This study aimed to compost urban pruning waste, evaluate its physical, chemical, structural characteristics, and determine its potential as a substrate to produce forest seedlings. The pruning residu...
Herbicide application is a practice commonly used in agricultural systems because it is an efficient method of weed control. An inherent characteristic of some herbicides used in mountain agriculture, such as oxyfluorfen, is high adsorption to soil organic matter (SOM). Thus, intensive management that changes the quantity and quality of SOM, such a...
White-rot fungi (Pleurotus eryngii) are decomposers of lignocellulosic substrates. The relationship between the structure of humified organic matter and P. eryngii growth, is poorly understood. This study aimed to evaluate the relationship between the growth and development of white-rot fungi (P. eryngii) in two structurally different sources of hu...
--Distinction of humic acids from different sources using 13C-NMR CP/MAS and ATR-FTIR combined to chemometrics--
The functions that humic acids (HA) can play in the environment are explained by their structural characteristics. Several spectroscopic techniques combined with chemometrics have been used to obtain a
better understanding of its struct...
Chemical eustressors induce a eustress state "positive stress" increasing the resistance and improve the plant growth. The potentiality of humic acids (HA) to act as a eustressor has been scarcely explored. The present study aims to evaluate how HA with different structural characteristics induce differently, a eustress state in rice plants through...
O objetivo do presente trabalho foi avaliar a biodisponibilidade dos metais pesados Fe e Mn em solos adubados com cama de frango com diferentes tempos de compostagem. Para isso, a cama de frango foi compostada por 60 dias e, posteriormente, amostras da cama
de frango não compostada e compostada por 30 e 60 dias foram incubadas com solo durante 90 d...
Understanding of the organomineral interactions in soil can elucidate the humic substances (HS) formation and the humification process. This study aimed to structurally characterize the humic acids (HA) formed in tropical soils with different pedogenesis degrees. The HA fraction was extracted from soil samples in the superficial horizons of an Ince...
This work aimed to study the impacts of long-term pig slurry (PS) amendment by soil organic matter (SOM) structural characterization. The study was conducted over 5 years in an experimental field with PS amendment. Two doses (50 m³ ha⁻¹ and 100 m³ ha⁻¹) of PS were applied to soil twice every year, once before planting the winter crop (Avena strigos...
Contamination by cadmium (Cd) is a serious problem in fragile sandy soils. In these soils, the high amount of sand fractions with uncharged surface and low organic matter content cause the high mobility of Cd. Biochar has been shown to be highly promising for mitigating adverse effects on soils, but little is known about its role in Cd-contaminated...
Histosols have a high organic matter content and therefore a high variability of structures and chemical functional groups with adsorptive capacity. This study aimed to select the most appropriate models to describe the sorption phenomena of Cu and Pb in Histosols, identify the types of bonds between these metals and soil samples, and assess the in...
Histosols provide several ecosystem services, related mainly to their reserves of carbon and nitrogen. Management practices in these soils can increase the mineralization of organic matter and contribute to the emission of greenhouse gases. This study aimed to investigate the effect of tillage with plowing and drainage on Histosol properties in thr...
Humic acids (HAs) stimulate the growth of several plant species by regulating their hormonal and redox metabolisms. Nevertheless, studies on the relationship of these substances with the plant-associated microbiota are almost nonexistent. Here, we hypothesized that the effect of HAs occurs in parallel with the regulation of the plant-associated bac...
Sugarcane burning has been widely practiced in Brazil and worldwide. In the long term, this farming practice can cause soil erosion, reduction in organic carbon (OC) and consequently, changes in the structure of soil organic matter (SOM). Such changes may be difficult to reverse. This study aimed to assess the medium- and long-term effects of sugar...
This study aimed to apply statistical response surface models (RSMs) to evaluate morphological parameters of plant root system changes in response to humic acid (HA). The study was carried out in a growth chamber. Experimental treatments consisted of HA extracted using IHSS methodology at increasing doses: 0, 20, 40, 60, 80, 110, and 150 mg HA L⁻¹....
En las primeras etapas de la fase vegetativa es donde la planta manifiesta su mayor susceptibilidad a cambios bruscos en las condiciones del medio, desatándose vías adaptativas que incluyen cambios en la estructura de las membranas celulares, por ser las primeras que responden a un daño. El frijol (Phaseolus vulgaris L.) es un cultivo de interés ag...
Due the Fungi of Basidiomycetes class plays an important role in the carbon cycling in the soil and use soil organic compounds for carbon metabolism was necessary a study to understand your act and demand on these sources. In this context two species deserve
mention due to their time of use and popularization being them Pleurotus ostreatus which is...
The structural identity of humic substances (HS) in the soil is a highly debated issue in the soil sciences. Although the complexity and structural characteristics that determine the functions of HS justify their further study, there is enough scientific evidence explaining the presence of these compounds as a group of structures that are formed by...
This study evaluates the interaction effects on corn (Zea mays L.) growth between intact humic substances (HS) extracted in an alkaline medium from three different origins (an Organosol [HS‐Org], an Andisol [HS‐And], and vermicompost [HS‐Vc]) and the arbuscular mycorrhizal fungus (AMF) Dentiscutata heterogama. The HS were characterized by spectrosc...
The effects of humic substances (HS) on plants are related to humic structure. The present study aimed to characterize HS different origins and to evaluate the effects on germination and protective effects against salt stress in corn. HS were extracted from an Andosol -Ecuador (HSAnd), Histosol -Brazil (HSHist) and vermicompost (HSVc) and character...
The aim of this work was to evaluate the vermicompost humic acid (HA) stimulatory effects on the N-uptake kinetics and the N metabolism of rice plants under high and low N-NO3⁻ or N-NH4⁺ supply in nutrient solution. Plants were grown in a growth chamber, and at 21 days after germination, they were submitted to N deprivation for 96 h, followed by HA...
Purpose
The beneficial effects of liquid humus applied to plants are well reported in the literature; however, studies of liquid humic application in the production and quality of garlic culture are practically nonexistent. The objective of this work was to evaluate the effects of foliar application of a liquid humic extract from vermicompost (HEVC...
Poultry litter (PL) is widely used as fertilizer because of its rich N, P and Ca content. When PL is applied to previously untreated soil, it is a potential contaminant. Composting is an alternative for stabilizing organic and mineral components. This study aimed to elucidate the structural changes and its influence on the solubility of heavy metal...
Availability of fresh water for crop irrigation is becoming scarce and rather expensive. In this context, the research about the potential reutilization of non-conventional water sources becomes highly relevant, principally in arid and semi-arid areas. On many occasions these new water resources involve water with a moderate concentration of salt,...