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Incidencia de los suelos de Portoviejo en edificación típica considerando interacción dinámica suelo-estructura
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Arteaga Medranda, Anthony

; Cevallos Centeno, Julio Hernán

Revista Digital Novasinergia

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Jun 2025, Volumen 8 Nº 1 Paginas 67 - 80

Resumen: En Es | Texto: En Es | PDF: En | PDF: Es

Abstract:In Ecuador, structural engineers traditionally design structures by considering embedded bases and assuming infinite soil stiffness. This methodology does not accurately reflect reality, as soil deforms when subjected to external forces. The research is based on the hypothesis that including soil-structure interaction always reduces the seismic response. To test this hypothesis, a reinforced concrete frame building, rectangular in shape with four levels and typical of educational units, was analyzed. The study compared traditional analysis methods to those incorporating site-specific characteristics, using spectra from the seismic microzonation of Portoviejo. Specifically, spectra from microzones M2, M3, and M4, all classified as type D soil, were compared to the NEC-15 spectrum for type D soil. The effects of soil-structure interaction were included using ASCE 41 and Gazetas methodologies. This analysis determined the influence of soil-structure interaction, which is crucial for optimizing structures. Depending on the type of soil on which the analysis is conducted, the demand can significantly reduce or increase. For sites with greater rigidity (Microzones M2 and M3), seismic stresses will be reduced. Conversely, for soft soils (Microzone M4), seismic stresses will increase. Therefore, an analysis based on site characteristics, plus the inclusion of soil-structure interaction, should always be applied when designing a building.

Resumen:En el Ecuador tradicionalmente los ingenieros estructurales, diseñan las estructuras considerando bases empotradas, asumiendo rigidez infinita del suelo, lo que es una metodología poco apegada a la realidad, debido a que el suelo presenta deformaciones cuando es sometido a fuerzas externas, la investigación parte de la hipótesis de que la inclusión de la interacción suelo-estructura causa siempre la reducción de la respuesta sísmica, por lo que el estudio consideró un edificación aporticada de hormigón armado, de forma rectangular vista en planta, de cuatro niveles típica de unidades educativas, con la finalidad de que esta fuera sometida a análisis tradicionales frente a análisis con características propias de sitio, se utilizó espectros tomados de la microzonificación sísmica de Portoviejo, específicamente de las microzonas M2, M3 y M4 siendo estas clasificadas como suelo tipo D, frente al espectro de la NEC-15 para suelo D. Para la inclusión de los efectos interacción suelo-estructura se desarrolló bajo las metodologías del ASCE 41 y Gazetas, logrando así determinar la influencia de la interacción suelo-estructura, misma que es de suma importancia ya que permite la obtención de estructuras optimizadas, debido a que acorde al tipo de suelo sobre el cual se plantee el análisis, la demanda puede reducir como aumentar considerablemente, es decir para sitios con mayor rigidez (Microzona M2, M3) las solicitaciones sísmicas se reducirán. Para el caso de suelos blandos (Microzona M4) las solicitaciones sísmicas aumentarán, por esto un análisis basado en características propias de sitio más la inclusión del análisis interacción suelo-estructura debería siempre ser comprendido al momento de diseñar una edificación.

https://doi.org/10.37135/ns.01.15.05

Enhancing maize yield and fertilizer efficiency in tidal swamp lands by employing biostimulants
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Mukhlis, Mukhlis Pratiwi, Etty Maftuah, Eni Nurzakiah, Siti Asikin, Syaiful Wakhid, Nur Lestari, Yuli Pasaribu, Askif Agustina, Rusmila

Chilean journal of agricultural research

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Abr 2025, Volumen 85 Nº 2 Paginas 170 - 180

Resumen: En | Texto: En | PDF: En

ABSTRACT Tidal swamp lands in Indonesia, despite their low productivity, hold significant potential for improving maize (Zea mays L.) cultivation and food security. Biostimulants derived from plants, animals, and plant growth-promoting rhizobacteria (PGPR) can enhance productivity and maize yields. Notably, rice husk ash (RHA), rich in silica, and golden apple snail (GAS; Pomacea canaliculata, Lamarck, 1822), containing amino acids, offer growth-promoting benefits. This study examines the impact of liquid RHA, GAS, and microbial inoculant (PGPR) on maize yield in acid sulphate soils from Barambai District, South Kalimantan, Indonesia. A randomized complete block design was used to test nine treatments, including a control (no NPK or biostimulants), full NPK, 75% NPK, and six biostimulant formulations (B1 to B6) combining RHA, GAS, and PGPR with 75% NPK. Biostimulants with more than 50% GAS extract significantly improved maize growth and yield while reducing NPK fertilizer use by 25%. Specifically, biostimulant formulations B1 (10% RHA, 80% GAS, 10% PGPR), B2 (20% RHA, 70% GAS, 10% PGPR), and B3 (30% RHA, 60% GAS, 10% PGPR), combined with 75% NPK, produced 126.0, 125.0, and 111.0 g plant-1, respectively, compared to 97.67 g plant-1 with full NPK. This suggests that biostimulants can reduce fertilizer use without sacrificing yield. The results highlight the role of amino acids in GAS extract for enhancing maize productivity. Biostimulants, particularly those rich in GAS extract, show promise in increasing maize grain yield and reducing reliance on inorganic fertilizers. Further field testing in real-world tidal swamps is needed to validate these findings.

https://doi.org/10.4067/s0718-58392025000200170

Investigating the impact of soil properties on the nutrient content and microbial community of sisal (Agave sisalana Perrine)
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Liu, Ping Huang, Zhaoxue Tan, Shibei Wu, Weihuai Chen, Tao Qin, Jianfeng Yi, Kexian Chen, Helong

Chilean journal of agricultural research

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Abr 2025, Volumen 85 Nº 2 Paginas 215 - 231

Resumen: En | Texto: En | PDF: En

ABSTRACT Sisal (Agave sisalana Perrine), a crucial natural fiber source, exhibits varying yields in China’s Guangdong and Guangxi regions. This groundbreaking study sampled soil and sisal leaves from these production hubs to explore the interplay among soil pH, enzyme activity, microorganisms, and sisal nutrition. Using PCR and high-throughput sequencing, results indicate Guangdong’s soil is mildly acidic, contrasting with Guangxi’s neutral to slightly alkaline soil. Both regions show a robust correlation between soil pH and nutrient availability (organic matter, P, K). Enhanced soil enzyme activity is observed at higher pH levels (6.09, 7.39). Dominant bacterial phyla Acidobacteria, Proteobacteria, and Actinobacteria peak at pH 7.39, 6.09, and 5.41, respectively. Fungal phyla Ascomycota, Basidiomycota, and Mortierellomycota thrive at pH 4.23, 7.39, and 6.48. Sisal leaves display optimal nutrient levels at specific pHs: N, P, and K at pH 6.09; Ca at pH 7.39; Mg at pH 6.48. Functional predictions reveal fungal abundance varies with pH, while bacterial functions like metabolism, disease resistance, and environmental adaptation are bolstered in Guangxi’s alkaline soils compared to Guangdong’s acidic ones. These findings provide a scientific basis for optimizing sisal cultivation management.

https://doi.org/10.4067/s0718-58392025000200215

Diversity of arbuscular mycorrhizal fungi and Soil Physicochemical Parameters in Forest Species of the Abras de Mantequilla Wetland, Ecuador
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Prieto-Benavides, Oscar Oswaldo

; Vivanco-Ube, Jenniffer Lisseth

; Cedeño-Moreira, Ángel Virgilio

; Urdánigo-Zambrano, Juan Pablo

; Maddela, Naga Raju

; Garcés-Fiallos, Felipe R.

Scientia Agropecuaria

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Ene 2025, Volumen 16 Nº 1 Paginas 7 - 15

Resumen: En | Texto: En | PDF: En

Abstract Wetlands worldwide face increasing challenges due to human activities such as water extraction, deforestation, and overfishing. These ecosystems are crucial for biodiversity, water retention, and purification. In Ecuador, the “Abras de Mantequilla” wetland exemplifies these pressures. It serves as a vital site for studying the interactions between soil fertility and arbuscular mycorrhizal fungi (AMF) in forest ecosystems. The study focused on the soil fertility, particularly in relation to AMF in "Noah Morán" secondary forest within the Abras de Mantequilla wetland. The key role of AMF in improving soil fertility was highlighted. Soil samples were collected from the root zone of four forest tree species i.e., Guazuma ulmifolia, Albizia guachapele, Eugenia pustulescens, Cecropia peltate. The four investigated soil samples had marginal differences in the soil physicochemical properties. Number of AMF species were found in the four soils in the range of 16 to 39; Number of por Several AMF lowest por the lowest (16) and highest (39) AMF species were found in E. pustulescens and A. guachapele soils, respectively. AMF species ‘Akent’ was the most dominant (abundance #16) AMF species found in the soils of C. peltate. The ranges of Shannon_H and Simpson_1-D values were found to be 1.78-1.9 and 0.79-0.85, respectively. These insights are important to understanding soil-plant-microorganism interactions in promoting sustainable agricultural practices in the Abras de Mantequilla wetland.

https://doi.org/10.17268/sci.agropecu.2025.001

Discussion of “Forks in the road: decisions that have shaped and will shape the teaching and practice of geotechnical engineering”*
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MacRobert, Charles John

Soils and Rocks

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2025, Volumen 48 Nº 1 elocation e2025007124

Resumen: En | Texto: En | PDF: En

https://doi.org/10.28927/sr.2025.007124

Radial consolidation considering Newtonian and non-Newtonian viscous components of the effective stress
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Carneiro, Raphael Felipe

; Martins, Ian Schumann Marques

; Gerscovich, Denise Maria Soares

Soils and Rocks

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2025, Volumen 48 Nº 1 elocation e2025003124

Resumen: En | Texto: En | PDF: En

Abstract Research on the viscous behavior of soft soils suggested that the effective stress should be divided into two components. One is related to the solid contacts between the grains, and its variation would be the true cause of deformations and distortions. The other is related to the viscous contacts of the water adsorbed to the grains, which would not cause deformations or distortions, and would be a function of the strain rate. This model is able to explain some phenomena, such as secondary consolidation and the increase in pore pressure after drainage closure. However, a consolidation theory adopting a linear relationship between the viscous component and the strain rate (Newtonian behavior) could not reproduce the secondary consolidation as seen in consolidation tests. In this paper, three theories of radial flow consolidation were developed and solved analytically. In two of them the linear relationship was adopted, while in the third one a non-linear relationship was proposed (non-Newtonian behavior). The solutions showed that the linear relationship is in fact not able to reproduce secondary consolidation, but the non-linear relationship provided much better results and can be a promising tool for future studies.

https://doi.org/10.28927/sr.2025.003124

Pseudo-static analysis of tunnel face stability using the Mohr-Coulomb strength criterion
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Saada, Zied

; Garnier, Denis

; Maghous, Samir

Soils and Rocks

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2025, Volumen 48 Nº 1 elocation e2025011423

Resumen: En | Texto: En | PDF: En

Abstract The paper addresses the stability analysis of a circular tunnel face driven by a pressurized shield by means of the limit analysis kinematic approach implemented in the context of the Mohr-Coulomb strength condition. Emphasis is given to the assessment of the effects of seismic loading on the value of face support pressure that is required to prevent failure. The approach relies upon the pseudo-static method to model the destabilizing effects induced by the inertial forces associated with the passage of seismic waves in the ground. Rigorous limit analysis solutions for the limit face supporting pressure are derived from the analytical implementation of 3D and 2D failure mechanisms specifically devised for dealing with such a stability analysis problem. Indeed, original analytical expressions are provided and allow the evaluation of the pressure stabilizing the tunnel face. The accuracy of the approach predictions is assessed by comparison with available experimental and analytical results as well as with 2D finite element solutions. The influence of some relevant problem parameters in the context of tunnel face stability analysis is finally investigated, thus providing some preliminary guidelines for practical use in tunnel engineering.

https://doi.org/10.28927/sr.2025.011423

Influence of T-bar test penetration rate on undrained shear strength of a laboratory clayey mixture
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Faria, Daniel de Andrade

; Godoy, Vinícius Batista

; Schnaid, Fernando

; Festugato, Lucas

Soils and Rocks

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2025, Volumen 48 Nº 1 elocation e2025010423

Resumen: En | Texto: En | PDF: En

Abstract Extensive and accurate data from on-site testing is increasingly fundamental in determining design geotechnical parameters of offshore structures. As a novel method for assessing offshore soil, the T-bar penetrometer offers benefits such as high precision, reliability, ample data acquisition and cost-effectiveness, but its application in offshore projects remains limited. In this research, a set of approaches are used to analyze the evaluation of penetration rate effects in a kaolin and bentonite mixture prepared to reproduce Brazilian offshore soil conditions aiming the development of in situ testing technology in the marine engineering area. Miniature T-bar penetrometer tests (10 mm diameter and 50 mm length) at constant driving penetration rate were performed at 0.05; 0.1; 0.25; 0.5; 1.0; 2.5 and 5.0 mm/s. In addition, three variable rate tests (twitch tests) were performed aiming to analyze the penetration rate reductions at each twitch stage. The measured resistances and the drainage conditions were interpreted using the normalized velocity (V), and the results show a strength increase by viscous effects of 10% for each logarithmic cycle of penetration rate increase. The results suggest that the transition between the undrained and partially drained penetration occurs at normalized penetration rates between 20 and 50. These results agree with values previously published in the literature and unequivocally demonstrate how the influence of penetration rate can impact the measured undrained shear strength for T-bar tests. It is concluded that the influence of the test penetration rate on the measured resistance cannot be disregarded in intermediate permeability soils.

https://doi.org/10.28927/sr.2025.010423

Numerical simulation of the size effect on rock particle crushing behavior considering microscopic heterogeneous bond strength characteristics
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Qiu, Jiong

; Kuang, Du-min

; Wang, Meng-bo

; Chen, Long

; Peng, Cheng

; Song, Zhao-bo

Soils and Rocks

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2025, Volumen 48 Nº 1 elocation e2025009723

Resumen: En | Texto: En | PDF: En

Abstract The heterogeneity of microelement strength of rock particle materials is one of the main factors that cause the size effect of the rock particle crushing behavior. In this paper, a numerical model of rock particles that considering the characteristic of microscopic heterogeneous bond strength was established by using Weibull distribution theory through discrete element method. Single particle crushing experiments were carried out on five groups of rock particles and numerical particles with different particle sizes (6-21 mm), the crushing strength and failure modes of rock particles and numerical particles with different sizes were obtained. The results shows that the proposed numerical model can effectively reproduce the size effect of rock particle crushing behavior. The particle crushing strength data are satisfied the Weibull statistical model and have obvious size effect. The particle failure modes can be divided into three different failure types: “brittle” failure, “quasi brittle” failure, and “ductile” failure. As the particle size increase, the particle failure mode changes from “ductile” failure to “brittle” failure. Finally, a microscopic damage function model of particle crushing was established based on the numerical simulation results, which explained the microscopic mechanism of the size effect of particle crushing behavior. This study not only helps to improve the stability of engineering materials, but also optimizes engineering design and construction, and promotes related technological innovation.

https://doi.org/10.28927/sr.2025.009723

10.

Critical limit for phosphorus in a Red Latosol of the Brazilian Cerrado
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Hemielevski, Louise Stefanello

; Menezes, June Faria Scherrer

; Oliveira, Augusto Matias de

; Berti, Mariana Pina da Silva

; Machado, Linia Dayana Lopes

; Boldrin, Paulo Fernandes

; Cantão, Veridiana Cardozo Gonçalves

; Silva, Rodrigo Gomes

Revista Ciência Agronômica

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2025, Volumen 56 elocation e202393916

Resumen: En | Texto: En | PDF: En

ABSTRACT Successive applications of phosphate fertilisers can exceed the phosphorus (P) requirements of plants and soil, resulting in surface accumulation and loss to aquatic systems, and therefore require monitoring. The aim of this study was to determine a mathematical model for the critical limit for phosphorus in the environment (CLPE) in a Red Latosol of the Cerrado, and to monitor the amount of P in the soil of 46 rural properties in the micro watershed of the Ribeirão Abóbora River. Sand was added to a dystroferric Red Latosol to simulate soils with textures of 10%, 20%, 30%, 40% and 50% clay, in order to quantify the maximum P adsorption capacity (MPAC) and determine the CLPE. Soil from 46 rural properties that make up the micro watershed of the Ribeirão Abóbora River was collected, and the P and clay content was determined. The MPAC decreased proportionally to the reduction in clay content. Th e estimating equation to determine the CLPE for the Red Latosol of the Cerrado is CLPE = 16.64 + 0.432* (% clay), which can be simplified to CLPE = 20 + 0.5* (% clay). The P content on four of the properties in the micro watershed of the Ribeirão Abóbora River is greater than the CLPE. It is therefore recommended that the use of phosphate sources be suspended until appropriate P levels return, and that close attention be paid to these properties so that P values again reach acceptable levels, and no P is transferred to the water sources.

https://doi.org/10.5935/1806-6690.20250035

11.

Contribution of mycorrhiza and phosphate-solubilizing fungi in coffee seedling growth in four soils with different fertility conditions
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González-Osorio, Hernan

; Sadeghian, Siavosh

; Mira, Beatriz Eugenia

Bragantia

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2025, Volumen 84 elocation e20240171

Resumen: En | Texto: En | PDF: En

ABSTRACT Phosphorus (P) is a limiting nutrient for coffee seedlings. To meet this requirement, coffee growers usually apply di-ammonium phosphate (DAP), which is highly sensitive to local price fluctuations. The use of arbuscular mycorrhizal fungi (AMF) and phosphate-solubilizing fungi (PSF) has been recommended, but the results derived from their application are inconsistent and uncertain, depending on soil fertility status. The response of AMF and PSF application in the plant growth of coffee seedlings during the nursery stage was evaluated in four non-sterile soils, which represent the most abundant type of soils in the coffee regions of Colombia: Eutropept, Dystropept, Fulvudand, and Ultisol. The treatments included a commercial AMF inoculum, PSF-Phlebia subserialis-CH4, and a consortium of AMF+PSF, at four P levels (0, 0.5, 1, and 2 g.plant-1 P2O5) using DAP fertilizer. Shoot dry weight (SDW) was affected by P applications in Fulvudand. In the other soils, a P-response occurred with 0.5 g.plant-1 , whereas 1 and 2 g.plant-1 of P2O5 caused a significant reduction in SDW. AMF increased SDW by 40% in Eutropept. The negative effect of higher P amounts was mitigated (> 70%) through PSF and AMF+PSF in Ultisol and Eutropept, respectively. In plants in which microorganisms increased SDW, the P concentration was 0.17 to 0.22%. The plant growth promotion of coffee seedlings during the nursery stage with AMF and/or PSF applications varied according to soil type and P amounts applied.

https://doi.org/10.1590/1678-4499.20240171

12.

Finite element analysis of soil-nailed vertical excavation in fine-grained soils in an urban area
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Lanzieri, Daniel Rocha

; Avesani Neto, José Orlando

Soils and Rocks

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2025, Volumen 48 Nº 1 elocation e2025010523

Resumen: En | Texto: En | PDF: En

Abstract This paper presents analysis and discussion of an urban vertical excavation, with the soil nailing technique, in fine-grained soils with high plasticity. The excavation was numerically evaluated using finite element analysis (FEA) using a 3D finite element model (FEM). Several field and laboratory soil investigations were conducted, interpreted and used in the FEA. The FEM model was calibrated using instrumentation and monitoring results during the soil nailing construction. Analyses were conducted focusing in horizontal displacements, nail pullout strength, nail tensile load, soil stress state, and tensile load at the nail head. The results showed that the behavior of the soil nailing retaining wall in fine-grained soils differs significantly from what is typically reported in the literature for non-cohesive soils. The high apparent cohesion of the fine-grained soil resulted in good performance, with reduced horizontal displacements on the face and lower tensile loads in the nails and at their head.

https://doi.org/10.28927/sr.2025.010523

13.

Saturated hydraulic conductivity and steady-state infiltration rate database for Brazilian soils
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Ottoni, Marta Vasconcelos

; Teixeira, Wenceslau Geraldes

; Reis, Aline Mari Huf dos

; Pimentel, Letícia Guimarães

; Souza, Luciana Rodrigues

; Albuquerque, Jackson Adriano

; Melo, Valdinar Ferreira

; Cavalieri-Polizeli, Karina Maria Vieira

; Reichert, José Miguel

; Viana, João Herbert Moreira

; Fontana, Ademir

; Medrado, Lucas de Castro

; Santos, Glenio Guimarães

; Amaral, Luís Gustavo Henriques do

; Anjos, Lúcia Helena Cunha dos

; Araújo Filho, José Coelho de

; Bhering, Silvio Barge

; Brito, Gabrielle Fernandes de

; Valle, Pedro Gomes de Campos do

; Campos, Pablo Nieto

; Costa, Adriana Monteiro da

; Marques, Jean Dalmo de Oliveira

; Martins, Alba Leonor da Silva

; Nascimento, Michele Bruna de Souza do

; Noronha, Norberto Cornejo

; Oliveira, Ricardo Duarte de

; Portela, Jeane Cruz

; Serafim, Milson Evaldo

; Silva, Marlen Barros e

; Rodrigues, Sueli

; Almeida, Wilk Sampaio de

; Moraes, Margareth Lopes de

; Curi, Nilton

Revista Brasileira de Ciência do Solo

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2025, Volumen 49 elocation e0240003

Resumen: En | Texto: En | PDF: En

ABSTRACT Soil saturated hydraulic conductivity (Ksat) and steady-state infiltration rate (SSIR) are essential and necessary soil properties for different geoscience applications. Values of these hydraulic properties for the Brazilian territory are difficult to access and are dispersed in research efforts carried out around the country. This study developed an easy-to-manipulate, freely accessible database of soil saturated hydraulic conductivity, comprising field and laboratory analyses, and steady-state infiltration rates for Brazilian soils. This database was named Ksat-SSIR-DB. One analysis of the Ksat-SSIR-DB aimed to evaluate its coverage in Brazilian territory and in different soil groups. Average values of these hydraulic properties were also presented for textural classes, with values compared to those reported in international literature, and for other groupings, such as soil class, land use class, and porosity class. The variability of Ksat data in these groupings and in their combinations were also analyzed. The Ksat-SSIR-DB showed broad national coverage, comprising a total of 2,579 records, corresponding to 409 sampling sites, with Ksat and/or SSIR data and other associated soil information. A significant difference was observed between Ksat values for the vast majority of Brazilian clayey and very clayey soils compared to soils from the same textural groups from temperate regions. The two groupings that presented the lowest variability in terms of Ksat standard deviation values were the combination of textural classes with soil classes at the second category level of SiBCS (Brazilian Soil Classification System), and porosity classes with soil classes at the second category level of SiBCS. The Ksat-SSIR-DB has enormous potential for developing and testing Ksat pedotransfer functions in Brazilian soils, serving as a reference source for different geoenvironmental applications and, in particular, for modeling land surface processes. It is open access and can be accessed at https://www.sgb.gov.br/ksat-ssir-dbbase-de-dados-de-condutividade-hidraulica-saturada-e-de-taxa-de-infiltracao-basica-emsolos-brasileiros, which also includes the python script for data analysis.

https://doi.org/10.36783/18069657rbcs20240003

14.

Leguminous Cover Crops Increase the Biomass and Nutritive Value of Grasses in South African Soils: A Review
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Mashece, W. Sindesi, A.O. Silwana, S. Tshuma, F.

South African Journal of Agricultural Extension

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2025, Volumen 53 Nº 1 Paginas 61 - 85

Resumen: En | Texto: En | PDF: En

Due to the expansion of farming, many agricultural systems now depend more on chemical pesticides and inorganic fertilisers to boost farm output. Leguminous cover crops are used to improve soil fertility and to increase nitrogen availability for crop production. This review focuses mainly on evaluating the role of leguminous cover crops on soil's physical, chemical and biological properties. Furthermore, it focuses on the role of cover crops in crop biomass, grass nutritive value and crop-livestock grazing systems. This review used the Web of Science, Scopus and Google Scholar databases (accessed between January 2003 and December 2022). To find publications in the scope of the study, the authors combined different groups of keywords. The reviewed literature revealed that leguminous cover crops significantly increase yield due to an increase of nitrogen through nitrogen fixation. In addition, leguminous cover crops boost the forage's nutritional value, lowering feed costs and increasing livestock productivity. As a result of these findings, farmers can reap the benefits of leguminous cover crops in various ways, including enhancement of soil health, biomass, yield and reducing overall production costs.

https://doi.org/10.17159/2413-3221/2025/v53n1a17571

15.

Inoculation and co-inoculation of the winter bean and chemical treatment of the seeds coinoculation co inoculation
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Costa, Danielle Bolandim

; Andreotti, Marcelo

; Souza, Isabela Malaquias Dalto de

; Souza, Paulino Taveira de

; Mateus, Matheus Pereira de Brito

; Silva, Ilca Puertas de Freitas e

Revista Ciência Agronômica

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2025, Volumen 56 elocation e202292317

Resumen: En | Texto: En | PDF: En

ABSTRACT Given the large differences in the results of inoculation and co-inoculation in the bean crop, an experiment in cultivating winter beans was carried out in 2019 under greenhouse conditions with the aim of evaluating the performance of the beans and a possible increase in plant growth and grain production, using seeds inoculated or co-inoculated with Rhizobium tropici and Azospirillum brasilense, with and without fungicide and/or insecticide, in sandy and clayey soils. A total of 112 pots were used, and 14 treatments were applied in a completely randomised experimental design, with four replications. The Scott-Knott test was used to analyse the results, and showed that whether using untreated seeds or carrying out complete chemical treatment with fungicide and insecticide plus co-inoculation with R. tropici and A. brasilense, winter bean production was reduced in clayey soil, while the joint use of fungicide and insecticide, fungicide and R. tropici, or fungicide, insecticide and R. tropici, favoured shoot development. Inoculating with A. brasilense, without R. tropici and with insecticide, or insecticide and fungicide, favoured greater root growth in clayey soil. In sandy soil, grain production was higher using seeds treated solely with insecticide, solely with R. tropici, or with a combination of both. Production was lower in the joint treatment with fungicide, insecticide and the co-inoculation of bacteria, or when using insecticide together with A. brasilense. coinoculation co crop 201 coinoculated brasilense andor soils 11 1 design replications ScottKnott Scott Knott R soil development both bacteria 20 2

https://doi.org/10.5935/1806-6690.20250020

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