Soil Science, Agronomy and Crop Science, Agricultural and Biological Sciences
181
Scopus Publications
Scopus Publications
Preliminary quantification of sediment contributions from land use sources to a natural turbid endorheic shallow lake (Barros Lake, Rio Grande do Sul, Brazil) Luce Helena Kochem, Rafael Ramon, Tales Tiecher, Olivier Evrard, Gabriele Victória de Godoy Jorge da Costa Franco, Luise Marina Scapin, Vitor Leão, Claudia Alessandra Peixoto de Barros Journal of Soils and Sediments, 2026 Shallow freshwater lakes near the coastline are often affected by sediment pollution. Sediment source fingerprinting (SSF) methods can aid catchment managers in identifying primary sediment sources that impact aquatic environments. This preliminary study aimed to estimate the contribution of sediment sources from the main land uses of a coastal catchment strongly influenced by wind and whose outlet is a eutrophic, endorheic lake with inflow from 11 affluents. The Barros Lake catchment (90 km2), located in southern Brazil, comprises grasslands (37.7%), croplands (32.2%), a mosaic of grasslands and croplands (12.4%), forests (12.6%), silviculture (3.8%), gravel mines (0.8%), and urban areas (0.5%). Two sediment sampling approaches were defined: (1) soil from land uses and (2) deposited sediments at the affluent banks. Suspended sediment samples were collected monthly from the lake between October 2021 and October 2022. Additionally, 22 geochemical elements were analyzed by ICP-OES after aqua regia digestion to select potential tracers using the three-step method of SSF in a mass balance model solved via Monte Carlo simulations. Agriculture (croplands + silviculture + grasslands) contributed 82% (± 4%) and 44% (± 10%) of the sediments for the soil and affluent source approaches, respectively, demonstrating the significant contribution of lowlands to lake sediment. The grouping method of affluent sources provided a useful alternative to soil samples when soil sources exhibitedsimilar properties. Despite the natural turbidity of the lentic water body, geochemical sediment tracing was feasible. Conservative soil management is essential for environmental protection, especially in the Pampa Biome.
Soil potassium pools across depths limit crop response in sandy loam soil Dionata Filippi, Luke Gatiboni, Andria Lima, David Hardy, Deanna Osmond, Tales Tiecher Agronomy Journal, 2026 Quantifying potassium (K) distribution across soil layers is crucial for understanding the often‐weak relationship between crop response to K fertilization and soil test K (STK). We evaluated exchangeable (STK Exch ), nonexchangeable (STK NonExch ), and semi‐total K (K SemiTotal ) at depths 0–20 cm, 20–30 cm, 30–40 cm, 40–65 cm, and 65–90 cm, along with the partial K mass balance after 41 years of a long‐term K fertilization study on a Coastal Plain sandy loam soil in North Carolina, USA. In 2023, soil was sampled from three K fertilization regimes: lower (K0), like crop removal (K1), and greater than removal (K2), with long‐term cumulative applications of 93, 1969, and 3917 kg K ha −1 , respectively. The 41‐year partial K balance was negative for K0 (−1615 kg K ha −1 ) and K1 (−136 kg K ha −1 ) but positive for K2 (1836 kg K ha −1 ). Although K2 received 42 times more K fertilizer than K0, its cumulative removal was only 22% greater, and yield response occurred in only 40% of the crops. Overfertilization (K2) enriched all soil K forms and promoted downward movement to 65–90 cm, where STK Exch doubled compared with K0 (55 vs. 26 mg kg −1 ). The K SemiTotal at 20–90 cm was higher under K2 (2579 mg kg −1 ) than K0 (1941 mg kg −1 ). The K SemiTotal depletion at 20–40 cm under K0 indicates that feldspar‐derived K buffers crop demand. These findings highlight that K contributions from less‐available K pools across soil layers can diminish crop responses to fertilization and weaken STK‐yield relationships.
Phosphorus recommendations in Brazil and Paraguay: A systematic review Alder Delosantos Duarte‐Monzón, Jimmy Walter Rasche‐Alvarez, Luciano Colpo Gatiboni, Gustavo Frosi, Amanda Posselt Martins, Alberto Vasconcellos Inda, Danilo Rheinheimer dos Santos, Tales Tiecher Soil Science Society of America Journal, 2026 Fertilizer recommendation systems in Brazil and Paraguay are based on soil analysis and correlation‐calibration experiments; however, they often recommend divergent phosphate fertilizer rates for the same crop and yield target. This study compares phosphate fertilizer recommendation systems for soybean [ Glycine max (L.) Merr.], wheat [ Triticum aestivum (L.)], and maize [ Zea mays (L.)], using standardized yield targets of 3, 4, and 10 Mg ha −1 , respectively. Eleven regional recommendations were evaluated: ten from Brazil and one from the Eastern Region of Paraguay. Most systems use the Mehlich‐1 method to extract available P, except São Paulo, which uses an anion exchange resin. The widespread use of Mehlich‐1 allows comparison of critical soil test values (CSTV) of P across tropical and subtropical soils. In several systems, CSTV declines with increasing clay content, likely due to extractor limitations and P readsorption during decantation, yet few recommendations explicitly incorporate P sorption capacity (e.g., clay content) when defining rates. Differences among calibration experiments have resulted in a wide range of CSTV (4–56 mg dm −3 ) and recommended P 2 O 5 rates of 82–415 kg ha −1 for soybean (≈36–181 kg P ha −1 ), 87–329 kg ha −1 for wheat (≈38–144 kg P ha −1 ), and 118–362 kg ha −1 for maize (≈52–158 kg P ha −1 ). Mehlich‐1 thresholds above which phosphate fertilization becomes unnecessary also varied widely (5–35, 3–37, and 6–46 mg dm −3 for soybean, wheat, and maize, respectively). These results highlight the need for minimum guidelines to harmonize soil P test interpretation and phosphate fertilizer recommendations, improving P use efficiency in Brazil and Paraguay.
Comparison of potassium fertilizer recommendations for grain crops in Brazil and Paraguay Gustavo Frosi, Alder Delosantos Duarte‐Monzón, Luke Gatiboni, Alberto Vasconcellos Inda, Leandro Souza da Silva, Jessé Rodrigo Fink, Danilo Rheinheimer dos Santos, Tales Tiecher Soil Science Society of America Journal, 2026 Fertilizer recommendations in Brazil and Paraguay are based on regional systems. This study systematically compared potassium (K) recommendations for soybean ( Glycine max (L.) Merr), maize ( Zea mays L.), and wheat ( Triticum aestivum L.), highlighting their similarities and differences. Eleven fertilizer‐K recommendation systems were analyzed, including 10 Brazilian and one Paraguayan. The classes of availability, K buffering capacity , and recommended K rates were compared according to Mehlich‐I extracted soil K. The critical soil‐test K level varied at 30–135 mg dm −3 of K, a 3.5‐fold variation. For most systems, K recommendation considers available K as a primary decision‐making parameter, with some systems also using the cation exchange capacity (CEC) to interpret available K concentration both directly (CEC classes) and indirectly (K saturation of the CEC). The maximum recommended K rate in the soil varied widely. To produce 3 Mg ha −1 of soybean, the rates varied by 58–375 kg K 2 O ha −1 ; for 10 Mg ha −1 of maize, by 97–375 kg K 2 O ha −1 , and for 4 Mg ha −1 of wheat, by 62–330 kg K 2 O ha −1 . Conversely, the available K concentration in the soil after zero fertilization ranged from 48 to 385 mg dm −3 for soybean, from 56 to 604 mg dm −3 for maize, and from 54 to 542 mg dm −3 for wheat. These variations represent differences of roughly 700%, 980%, and 900%, respectively. Such discrepancies between systems can hinder the adoption of recommendation systems by users. Therefore, there is an urgent need to create strategies to reduce these discrepancies and harmonize potassium fertilization recommendations in Brazil and Paraguay.
Proposing Nutrient Reference Values in Peach Leaves Based on Bayesian Segmented Quantile Regression Jacson Hindersmann, Jean Michel Moura-Bueno, Gustavo Brunetto, Tales Tiecher, William Natale, Antonio João de Lima Neto, Lucas Henrique Klock, Eduardo Bernardt, João Henrique Stibe Silva, Gilberto Nava, Newton Alex Mayer, Caroline Farias Barreto, Fábio Joel Kochem Mallmann Journal of Soil Science and Plant Nutrition, 2026
Combining Vis-NIR Spectral Data and Multivariate Technique to Estimate Nutrient Contents in Peach Leaves Jacson Hindersmann, Jean M. Moura-Bueno, Gustavo Brunetto, Tales Tiecher, William Natale, Eduarda Zanon Cargnin, Eduardo Dickel Ambrozzi, João Alex Tavares Pinto, Natália Adam, Gilberto Nava, Renan Navroski, Fábio Joel Kochem Mallmann Horticulturae, 2026 Peach tree (Prunus persica L. Batsch) is a fruit species of great economic importance worldwide. Thousands of chemical leaf analyses are performed on a yearly basis to support decision-making about fertilizer application. However, traditional methods to determine nutrient content in plant tissue require a mix of strong acids, besides being time-consuming and generating polluting waste. Visible (Vis) and near-infrared (NIR) spectroscopy combined with multivariate techniques emerges as a potential solution to overcome limitations of traditional chemical analyses. The aim of the present study is to combine Vis-NIR spectral data and multivariate techniques to test strategies for the development of models to estimate nutrient content in peach leaves. The study estimated N, P, K, Ca, Mg, S, B, Cu, Fe, Mn, and Zn content in the leaves of peach trees grown in two locations, namely: Pelotas and Pinto Bandeira, in Southern Brazil. Therefore, local and regional scale prediction models were developed by combining preprocessed Vis-NIR spectral data to both Savitzky–Golay first-derivative (SGD1d) and partial least squares regression (PLSR) multivariate technique. Most of the proposed prediction models showed average accuracy (R2 ≥ 0.50 and <0.75, RPIQ ≥ 1.9 and <3.0). The local-1 ‘PB’ model showed higher nutrient prediction accuracy than the regional ‘PB + Pelotas’ model and the local-2 ‘Pelotas’ model. Estimates on nutrient content in peach tree leaves subjected to local, local-1 ‘PB’ and local-2 ‘Pelotas’ models fed with data collected in the same site showed better performance than calculations based on data from other sites and/or regions. Finally, the current study allowed making updates in the refinement of more sustainable techniques to set nutrient content.
Boosting soil carbon and nitrogen stocks by increasing soil test phosphorus Andria Paula Lima, Luke Gatiboni, Dionata Filippi, Tales Tiecher Journal of Environmental Quality, 2026 The phosphorus (P) availability's role in carbon (C) and nitrogen (N) accumulation in long‐term systems remains unclear. This study evaluated the P fertilization's influence on C and N storage, C:N ratio, humic matter, and the C:clay ratio in two long‐term corn ( Zea mays L.)/soybean [ Glycine max (L.) Merr.] rotation trials under conservation tillage in North Carolina. Soil samples were collected at 0–5, 5–10, 10–20, and 20–30 cm. A linear‐plateau model evaluated the effect of soil test phosphorus (STP), from long‐term fertilization, on C and N stocks at 0–10, 0–20, and 0–30 cm. Both sites exhibited depth‐based STP gradients, although P rates significantly affected C stocks only in the 0–10 cm layer at Tidewater. P availability influenced C stocks at both sites, with greater P content and a higher critical soil test phosphorus value (CSTV) in Tidewater. CSTVs derived from C and N stocks were strongly correlated with those based on relative crop yield ( R 2 = 0.99). On average, the sandy soil at Tidewater accumulated more C than the clayey soil at Piedmont, reflecting differences in C stabilization. Maintaining soil test phosphorus near the CSTV increased C stocks by 2.1–2.7 Mg ha − 1 and N stocks by 0.2–0.3 Mg ha − 1 across the evaluated depths, contributing to improved soil fertility and agroecosystem resilience. Piedmont soils, despite lower total C stocks, showed greater C storage potential due to higher clay content, reinforcing the need for site‐specific P management adapted to soil texture and C stabilization capacity.
Accumulation of phosphorus fractions in contrasting soils under long-term phosphate fertilization Tales Tiecher, Luke Gatiboni, Andria Paula Lima, Dionata Filippi Journal of Environmental Quality, 2026 Understanding phosphorus (P) dynamics in soils under conservation agriculture remains challenging because the long‐term effects of fertilization rates and soil texture on P accumulation, availability, and environmental risk are not being fully understood. This study evaluated P fraction accumulation and saturation indices across soil layers in response to increasing phosphate fertilizer rates in two long‐term experiments in North Carolina. The trials were conducted on Portsmouth soil (fine‐loamy over sandy or sandy‐skeletal, mixed, semiactive, thermic Typic Umbraquults) at Tidewater, managed under minimum tillage, and Lloyd soil (fine, kaolinitic, thermic Rhodic Kanhapludults) at Piedmont, under no‐tillage. Soil samples from 0‐ to 5‐cm, 5‐ to 10‐cm, 10‐ to 20‐cm, and 20‐ to 30‐cm depths were analyzed in 2022 using sequential chemical fractionation and P‐related indices, including P sorption and degree of P saturation (DPS). Most P fractions were significantly influenced by P rates and depth. In clayey Piedmont soil, occluded P reached 58% of total P and increased linearly with rates (up to 30 cm). Sandy Tidewater soil showed higher soluble P (up to 4 mg kg −1 at 0–5 cm) and DPS values reaching 40%, signaling environmental risk. The DPS index proved sensitive to increasing P fertilization, outperforming the P sorption index. Mehlich‐3 P exceeding 169 mg kg −1 in sandy soil indicates a contamination risk threshold due to elevated soluble P. Different behaviors of P fractions, especially occluded P, highlighted the importance of soil‐specific fertilization strategies and considering P saturation as essential for optimizing P use and mitigating environmental impacts. The DPS index emerges as a valuable tool for assessing fertilization history and guiding P management strategies.
Short-Term Effects of Soil Tillage Systems on Crop Yield and Soil Physical and Chemical Properties in the Brazilian Pampa Gustavo Nogara-Siqueira, Tadeu Luis Tiecher, Lucas Aquino Alves, Rafael Ziani Goulart, Vinicio Bordignon, Tales Tiecher Journal of Soil Science and Plant Nutrition, 2026 The conversion of native grasslands into agricultural land in the Brazilian Pampa biome has intensified land-use change, increasing the need for effective soil management strategies due to potential impacts on crop yield and soil physical and chemical properties. This four-year study evaluated the effects of three soil tillage systems (no-tillage [NT], minimum tillage [MT], and conventional tillage [CT]) on grain yield and soil physical and chemical properties of an Ultisol in the Brazilian Pampa. Crop yields were monitored over four growing seasons (2015–2019) in a randomized block design with three replicates. Soil physical properties were assessed twice during the first growing season and once during the second and fourth growing seasons, whereas the chemical properties were analyzed in the second growing season. In the first growing season, CT and MT resulted in the highest corn yields and less compaction in the 0–5 cm layer, as indicated by lower soil density and higher total porosity and macroporosity. However, by the fourth growing season, NT yielded higher soybean yields (18 and 34% higher than CT and MT, respectively) and less compaction in the 0–5 cm layer. The soil’s chemical properties were not affected by the tillage systems in the short term. Although NT initially tended to lead to lower yields, after four years it offered higher gains in crop yield and improved soil physical properties in the surface layer, highlighting its importance for soil conservation and productivity in the Brazilian Pampa Biome.
Carbon, Nitrogen, and Corresponding Stable Isotope Signatures Reveal Channel Banks as Major Sediment Sources in a Tropical Agricultural Watershed Fábio Farias Amorim, Yuri Jacques Agra Bezerra da Silva, Rennan Cabral Nascimento, Ygor Jacques Agra Bezerra da Silva, Angelo Jamil Maia, Tales Tiecher, Jean Paolo Gomes Minella, Yusheng Zhang, Hari Ram Upadhayay, Simon Pulley, Adrian L. Collins Land Degradation and Development, 2026 Uncertainties about the applicability of δ 13 C and δ 15 N as tracers of sediment sources in tropical river basins highlight the need for more in‐depth investigations of these isotopes. This study therefore assessed the effectiveness of δ 13 C and δ 15 N signatures in discriminating sediment sources in an agricultural catchment in Northeast Brazil. Three potential sediment sources were sampled as follows: unpaved roads, sugarcane cultivation, and channel banks. Suspended and riverbed sediments were used as target sediments. Source and sediment samples were sieved to two particle size fractions: < 63 and < 32 μm. The isotopes were evaluated using conservativeness tests, Kruskal–Wallis, linear discriminant analysis, and virtual mixtures. Our results indicated that δ 13 C and δ 15 N together are effective tracers for modeling sediment sources, providing significant detail on sediment delivery patterns in a tropical catchment under intensive land use. Both fractions showed no significant differences in conservativeness or source apportionment. However, the < 63 μm fraction yielded more robust discrimination potential and model estimates. Therefore, future studies in other catchments under similar conditions could focus on a single fraction, preferably the fraction < 63 μm, optimizing effort without compromising scientific robustness. Channel banks contributed the majority of sediment in both size fractions, indicating that agricultural expansion into riparian zones—resulting in the absence or inadequate type of vegetation cover—has accelerated erosion. This underscores the urgent need to restore riparian forests and protect these vulnerable areas, while also emphasizing the importance of developing innovative, interdisciplinary approaches to effectively manage and integrate riparian vegetation into landscape planning and water resource strategies.
Kinetics of soil re-acidification under no-tillage system Danilo dos Santos Rheinheimer, Edson Campanhola Bortoluzzi, Diovane Freire Moterle, Thibaut Le Guet, Marília Camotti Bastos, Lucas Lopes Coelho, Bruno Luís Meotti, Augusto de Souza Santana, Tales Tiecher Soil and Tillage Research, 2024
240Pu/239Pu signatures allow refining the chronology of radionuclide fallout in South America Pierre-Alexis Chaboche, Fabien Pointurier, Pierre Sabatier, Anthony Foucher, Tales Tiecher, Jean P.G. Minella, Marcos Tassano, Amélie Hubert, Sergio Morera, Stéphane Guédron, Christophe Ardois, Béatrice Boulet, Catherine Cossonnet, Pablo Cabral, Mirel Cabrera, Guillermo Chalar, Olivier Evrard Science of the Total Environment, 2022
Tributary contributions to sediment deposited in the Jacuí Delta, Southern Brazil Tales Tiecher, Rafael Ramon, Leonardo C. de Andrade, Flávio A.O. Camargo, Olivier Evrard, Jean P.G. Minella, J. Patrick Laceby, Edson C. Bortoluzzi, Gustavo H. Merten, Danilo S. Rheinheimer, Desmond E. Walling, Cláudia A.P. Barros Journal of Great Lakes Research, 2022
Base saturation is an inadequate term for Soil Science Tales Tiecher, Luke Gatiboni, Danilo Rheinheimer dos Santos, Carlos Alberto Bissani, Amanda Posselt Martins, Clesio Gianello, Deborah Pinheiro Dick, Edson Campanhola Bortoluzzi, Pedro Alexandre Varella Escosteguy, Leandro Souza da Silva, Gustavo Brunetto, Fábio Joel Kochem Mallmann, Volnei Pauletti, Cledimar Rogério Lourenzi, Rogério Oliveira de Sousa, Filipe Selau Carlos, Antônio Carlos Azevedo Revista Brasileira De Ciencia do Solo, 2022
Sediment source fingerprinting: benchmarking recent outputs, remaining challenges and emerging themes Adrian L. Collins, Martin Blackwell, Pascal Boeckx, Charlotte-Anne Chivers, Monica Emelko, Olivier Evrard, Ian Foster, Allen Gellis, Hamid Gholami, Steve Granger, Paul Harris, Arthur J. Horowitz, J. Patrick Laceby, Nuria Martinez-Carreras, Jean Minella, Lisa Mol, Kazem Nosrati, Simon Pulley, Uldis Silins, Yuri Jacques da Silva, Micheal Stone, Tales Tiecher, Hari Ram Upadhayay, Yusheng Zhang Journal of Soils and Sediments, 2020
Copper and zinc distribution and toxicity in ‘Jade’ / ‘Genovesa’ young peach tree Rodrigo K. Hammerschmitt, Tadeu L. Tiecher, Daniela B. Facco, Lincon O.S. Silva, Raíssa Schwalbert, Gerson L. Drescher, Edicarla Trentin, Luiza M. Somavilla, Matheus S.S. Kulmann, Isley C.B. Silva, Camila P. Tarouco, Fernando T. Nicoloso, Tales Tiecher, Newton A. Mayer, Amanda Veridiana Krug, Gustavo Brunetto Scientia Horticulturae, 2020
No-Till Farming Systems for Sustainable Agriculture in South America Ademir Calegari, Augusto Guilherme de Araujo, Tales Tiecher, Marie Luise Carolina Bartz, Rafael Fuentes Lanillo, Danilo Reinheimer dos Santos, Facundo Capandeguy, Jaime Hernandez Zamora, José Ramiro Benites Jump, Ken Moriya, Luciano Dabalá, Luis Enrique Cubilla, Martin Maria Cubilla, Miguel Carballal, Richard Trujillo, Roberto Peiretti, Rolf Derpsch, Santiago Miguel, Theodor Friedrich No Till Farming Systems for Sustainable Agriculture Challenges and Opportunities, 2020
Sediment pollution in margins of the Lake Guaíba, Southern Brazil Leonardo Capeleto de Andrade, Tales Tiecher, Jessica Souza de Oliveira, Robson Andreazza, Alberto Vasconcellos Inda, Flávio Anastácio de Oliveira Camargo Environmental Monitoring and Assessment, 2018
Distribution and redistribution of phosphorus forms in grapevines Rogério Piccin, João Kaminski, Carlos Alberto Ceretta, Tales Tiecher, Luciano Colpo Gatiboni, Roque Junior Sartori Bellinaso, Carina Marchezan, Rodrigo Otávio Schneider de Souza, Gustavo Brunetto Scientia Horticulturae, 2017
Release of phosphorus forms from cover crop residues in agroecological no-till onion production Rodolfo Assis de Oliveira, Universidade Federal de Santa Catarina, Brasil, Jucinei José Comin, Tales Tiecher, Rogério Piccin, Luiza Michelon Somavilla, Arcângelo Loss, Cledimar Rogério Lourenzi, Claudinei Kürtz, Gustavo Brunetto, Universidade Federal de Santa Catarina, Brasil, Universidade Federal do Rio Grande do Sul, Brasil, Universidade Federal de Santa Maria, Brasil, Empresa de Pesquisa e Extensão Rural de Santa Catarina, Brasil, Universidade Federal de Santa Maria, Brasil Revista Brasileira De Ciencia do Solo, 2017
Phosphorus fractions in apple orchards in Southern Brazil Djalma Eugênio Schmitt, Gustavo Brunetto, Elaine dos Santos, Winiciu de Lima Wagner, Paula Beatriz Sete, Monique Souza, Vítor Gabriel Ambrosini, Matheus Ademir dos Santos, Tales Tiecher, Jucinei José Comin, Rafael da Rosa Couto, Luciano Colpo Gatiboni, Admir Giachini Bragantia, 2017
The contribution of sediment sources in a rural catchment under no-tillage Tales Tiecher, Jean Paolo Gomes Minella, Pablo Miguel, Jimmy Walter Rasche Alvarez, André Pellegrini, Viviane Capoane, Lucas Henrique Ciotti, Gilmar Luiz Schaefer, Danilo Rheinheimer dos Santos Revista Brasileira De Ciencia do Solo, 2014
Phosphorus fractions in sandy soils of vineyards in Southern Brazil Djalma Eugênio Schmitt, Jucinei José Comin, Luciano Colpo Gatiboni, Tales Tiecher, Felipe Lorensini, George Wellington Bastos de Melo, Eduardo Girotto, Renato Guardini, Janaína Heinzen, Gustavo Brunetto Revista Brasileira De Ciencia do Solo, 2013
