1,720,996 research outputs found
Microbial community structure in a silty clay loam soil after fumigation with three broad spectrum fungicides
Full text linkThe short-term effect of three broad spectrum fungicides on microbial activity, microbial biomass, soil ergosterol content, and phospholipid fatty acid (PLFA) profiles was studied. A silty clay loam soil was treated separately with captan, chlorothalonil and carbendazim at three different dosages of each fungicide. Chlorothalonil and carbendazim significantly altered soil microbial activity. However, changes in soil microbial biomass were only observed in soil treated with higher dosages of these fungicides. All dosages of fungicides significantly decreased fungal biomass as estimated by soil ergosterol content. PLFA analysis indicated that there was a shift in PLFA pattern. Higher dosages of all three fungicides decreased a straight-chain PLFA 22:0. In addition, soil treated with carbendazim increased cyclopropyl fatty acids. Compared to untreated soil, higher dosages of both captan and chlorothalonil affected PLFA 10Me 16:0, indicating that these fungicides can reduce actinomycetes population. Finally, our results suggest that application of both captan and chlorothalonil decreased Gram-positive to Gram-negative ratio.Fil: Podio, Natalia Soledad. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas Físicas y Naturales. Instituto de Ciencias y Tecnología de los Alimentos; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Guzman, Carlos Alberto. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas Físicas y Naturales. Instituto de Ciencias y Tecnología de los Alimentos; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Meriles, Jose Manuel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto Multidisciplinario de Biología Vegetal. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas Físicas y Naturales. Instituto Multidisciplinario de Biología Vegetal; Argentin
Effect of planting date on Fusarium spp. and Diaporthe/Phomopsis complex incidence and its relationship with soya bean seed quality
No full textFifteen soya bean genotypes from maturity groups IV, V and VI were planted on three dates at Manfredi Experimental Station - INTA, Córdoba Province, Argentina. Seeds were harvested at maturity and evaluated for seed infection by Fusarium spp. and Diaporthe/Phomopsis complex, and for physical and chemical parameters. There was a significant negative correlation between planting date (PD) and fungal incidence (P = 0.05). A higher percentage of fungal incidence at earlier PD was consistent with lower seed weight and volume, higher oil content and no change in protein content. The highest values of fungal incidence were associated with increased oleic acid and decreased linoleic and linolenic acid contents. These results suggest that planting late maturity cultivars or delaying the planting of early and mid-season cultivars may reduce seed infection by Fusarium spp. and Diaporthe/Phomopsis complex.Fil: Meriles, Jose Manuel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto Multidisciplinario de Biología Vegetal. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas Físicas y Naturales. Instituto Multidisciplinario de Biología Vegetal; ArgentinaFil: Giorda, Laura Maria. Instituto Nacional de Tecnología Agropecuaria. Centro Regional Córdoba. Estación Experimental Agropecuaria Manfredi; ArgentinaFil: Maestri, Damian. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto Multidisciplinario de Biología Vegetal. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas Físicas y Naturales. Instituto Multidisciplinario de Biología Vegetal; Argentin
Soil microbiological and biochemical changes as a consequence of land management and water erosion in a semiarid environment
No full textThree sites were selected for the present study: native forest (FR), anagricultural land subjected to minimum water erosion by terracing farming (ARMN), and an agricultural land subjected to moderate water erosion without terracing farming (ARMD). Conversion of forest to agricultural land significantly affected soil physicochemical properties.The lowest contents of both humic and fulvic acids were registered in the ARMD site, while the highest was observed in FR. The site withmoderate water erosion showed a decrease of total microbial activityas estimated by fluorescein diacetate activity (FDA), but an increase ofdehydrogenase activity. Both C-related enzyme activities glucuronidaseand glucosidase as estimated by fluorogenic methylumbelliferil (MUF)-substrates were also reduced in ARMD, with moderate values in ARMNsite, and high values in FR. Our study revealed that ARMD had the meanmicrobial biomass estimated by phospholipid fatty acid (PLFA) profiles.Furthermore, the ARMD site showed the highest Gram-positive to Gramnegativeratio, suggesting that moderate water erosion may also affectsoil microbial community structure. The results of the present researchhave important implications for the study of deforestation under sitessubjected to water erosion, which is one of the most significant ecologicalchanges facing in central Argentina and the world.Fil: Dominchin, Maria Florencia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto Multidisciplinario de Biología Vegetal. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas Físicas y Naturales. Instituto Multidisciplinario de Biología Vegetal; ArgentinaFil: Verdenelli, Romina Aylen. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto Multidisciplinario de Biología Vegetal. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas Físicas y Naturales. Instituto Multidisciplinario de Biología Vegetal; ArgentinaFil: Antonio Marcelo, Aoki. Universidad Nacional de Córdoba. Facultad de Ciencias Agropecuarias; ArgentinaFil: Meriles, Jose Manuel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto Multidisciplinario de Biología Vegetal. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas Físicas y Naturales. Instituto Multidisciplinario de Biología Vegetal; Argentin
Impacto a largo plazo de la fertilización mineral sobre la estructura de las comunidades microbianas de suelo
No full textEl concepto de calidad de suelo se encuentra estrechamente asociado al cumplimiento de funciones específicas, tales como la sustentabilidad de la actividad biológica, ciclado de nutrientes, la capacidad productiva, etc. Las prácticas de manejo como la aplicación de fertilizantes minerales, especialmente nitrógeno (N), fósforo (P) y azufre (S) son capaces de inducir importantes cambios en las propiedades químicas y microbiológicas del suelo. Los microorganismos del suelo contribuyen de especial manera al ciclado de nutrientes, y en la degradación de compuestos orgánicos del suelo, entre otras funciones. De esta manera, el estudio de las comunidades microbianas puede proveer una medida integral de la calidad del suelo. En el presente trabajo, además de un análisis químico de las propiedades del suelo, se abordaron aspectos bioquímicos (actividad metabólica/enzimática y estructura de las comunidades microbianas por PLFA) y moleculares (abundancia estimada por qPCR, estructura y diversidad genética por marcadores moleculares T-RFLP). El objetivo fue estudiar la estructura y función de las comunidades microbianas de suelo desde distintos enfoques (químico, bioquímico y molecular) para establecer el impacto de la aplicación a largo plazo de diferentes combinaciones de fertilizantes minerales en suelos productivos de Argentina. El ensayo experimental estuvo ubicado en uno de los lotes del Consorcio Regional de Experimentación Agropecuaria (CREA), Teodelina, Santa Fe-Argentina. El ensayo se realizó bajo un sistema de rotación maíz/soja y trigo como cultivo de cobertura, con siembra directa. Los tratamientos fueron NPS+micronutrientes, NPS, NP, NS, PS y TE (sin fertilizante), por triplicado. Los muestreos de suelo fueron realizados en cuatro campañas consecutivas, y el análisis se realizó por cultivo durante 2 ciclos de rotación consecutivos (2 con maíz y 2 con soja). Detectamos que la aplicación a largo plazo de fertilizantes, principalmente con N, produjo acidificación edáfica e incrementos en el contenido de carbono orgánico total (COT) y de nutrientes totales y disponibles en el suelo. Además, los suelos triple fertilizados mostraron incrementos en la respiración microbiana, en las actividades PHA, FDA y en el contenido de PSRG. La fertilización incrementó la biomasa microbiana total y presentó una marcada influencia sobre las bacterias Gram-negativas y VAM. La fertilización también decreció la diversidad y riqueza microbiana y disminuyó la abundancia de genes bacterianos. Sin embargo, la fertilización incrementó la abundancia de genes fúngicos principalmente en los suelos triple fertilizados. En general, las mayores diferencias en el conjunto de variables analizadas fueron observadas entre los tratamientos triple fertilizados y el suelo sin fertilizar. El estudio del efecto de diferentes regímenes de fertilización sobre la estructura y función de las comunidades microbianas permite reducir enfermedades en los cultivos, aumentar la producción, aumentar la fertilidad del suelo y hacer más eficiente el uso sostenido de los recursos. Los resultados de este estudio proporcionaron una valiosa información sobre los efectos de la fertilización sobre la calidad química y microbiológica de los suelos de la regiónFil: Verdenelli, Romina Aylen. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto Multidisciplinario de Biología Vegetal. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas Físicas y Naturales. Instituto Multidisciplinario de Biología Vegetal; Argentin
Impact of N-fertilization and peanut shell biochar on soil microbial community structure and enzyme activities in a Typic Haplustoll under different management practices
No full textThe application of biochar with N-fertilizer is one of the most attractive practices for increasing soil quality and fertility. However, few studies have examined the combined effects of peanut biochar and urea on soil microbial community structure and function. Phospholipid fatty acid (PLFA) analysis and various enzyme activities were used to monitor microbial community structure and function in a 20-week incubation experiment. Different rates of biochar (0, 1, and 3% dry wt. soil) and N-fertilizers (with or without urea addition at 0.2 g kg−1) were applied to a Typic Haplustoll under conventional (CV) and conservation (CS) land management practices. A pristine forest soil (CK) was also included as control. Overall, the lowest microbial activity and abundance of microbial PLFA bioindicators were recorded under CV, confirming that conservation management may improve soil quality. Our study also indicated that the effect of biochar and management practices on the microbial community structure was more significant than that of urea. Particularly under both CS and CK, biochar tended to increase glucosidase, glucuronidase, and phosphomonoesterase activities, being on average 65%, 43%, and 85% significantly higher in biochar 3% than in the control treatment, respectively. Thus, we found a strong correlation between soil macronutrients and enzymes such as glucosidase and urease. Although total PLFA content was poorly affected, biochar addition increased some individual PLFA biomarkers, suggesting that both the biochar rates (1% and 3%) may increase Gram-negative bacteria and fungal populations. Regardless of biochar addition, urea application significantly increased urease activity. We also found a positive correlation between fungal PLFAs (VAM and total fungi) and urease activity, indicating that biochar tended to increase fungal biomass. The combined application of biochar and urea to soil under appropriate management may thus be a feasible and effective strategy for improving soil microbial quality.Fil: Dominchin, Maria Florencia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto Multidisciplinario de Biología Vegetal. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas Físicas y Naturales. Instituto Multidisciplinario de Biología Vegetal; ArgentinaFil: Verdenelli, Romina Aylén. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto Multidisciplinario de Biología Vegetal. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas Físicas y Naturales. Instituto Multidisciplinario de Biología Vegetal; ArgentinaFil: Berger, Micaela Gisell. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto Multidisciplinario de Biología Vegetal. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas Físicas y Naturales. Instituto Multidisciplinario de Biología Vegetal; ArgentinaFil: Antonio Marcelo, Aoki. Universidad Nacional de Córdoba; ArgentinaFil: Meriles, Jose Manuel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto Multidisciplinario de Biología Vegetal. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas Físicas y Naturales. Instituto Multidisciplinario de Biología Vegetal; Argentin
Relationships between soil physicochemical properties and nitrogen fixing, nitrifying and denitrifying under varying land-use practices in the northwest region of Argentina
Full text linkThe aim of this study was to evaluate the response pattern of diazotrophic microbes, denitrifiers and nitrifiers to different types of land use management, such as soybean monoculture (M) during 5 and 24 years (M5 and M24) and soybean-maize rotation (R) during 4 and 15 years (R4 and R15) in two subsequent years at the time point of flowering. Soil samples from a site recently introduced into agriculture (RUA) and a pristine soil under native vegetation (NV) were used as controls. Abundances of different functional groups of microbes were assessed using the direct quantification of marker genes by quantitative real-time PCR using extracted DNA from rhizosphere samples. In addition, soil chemical and physical properties were analysed and correlated with the abundance data from the functional microbial groups under investigation. Overall, the results indicate that the abundance of nifH genes was higher under R treatments compared to M treatments. The abundance of ammonium monooxygenase genes amoA (AOA) was generally higher under rotation systems and decreased under M24. RUA evidenced a negative effect on the establishment and development of AOA communities. The influence of land use on nirS abundance was inconsistent. However, R treatments showed a high abundance of nirK genes compared to M treatments. In both growing seasons, the abundance of nosZ genes was higher under NV compared with the other treatments. Furthermore, M24 treatment was related to strongly changed chemical and physical soil properties compared with the other sites. As expected, soil samples from RUA showed the strong dynamics of measured parameters indicating the high sensitivity of soils under transition to environmental parameters. Our results also indicated that the long-term crop rotation modified the abundance of the investigated microbial groups compared to the monoculture and increased soil chemical and physical quality. Therefore, our results provide evidence for a stimulatory effect of the long-term crop rotation on the abundance of microbes involved in N transformation.Fil: Perez Brandan, Carolina Gabriela. Instituto Nacional de Tecnología Agropecuaria; ArgentinaFil: Meyer, Annabel. Helmholtz Center Munich German Research Center For Environmental Health; AlemaniaFil: Meriles, Jose Manuel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto Multidisciplinario de Biología Vegetal. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas Físicas y Naturales. Instituto Multidisciplinario de Biología Vegetal; ArgentinaFil: Huidobro, Jorgelina. Instituto Nacional de Tecnología Agropecuaria; ArgentinaFil: Schloter, Michael. Helmholtz Center Munich German Research Center For Environmental Health; AlemaniaFil: Vargas Gil, Silvina. Instituto Nacional de Tecnología Agropecuaria. Centro de Investigaciones Agropecuarias; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentin
Crop rotation and tillage systems as a proactive strategy in the control of peanut fungal soilborne diseases
Full text linkSoil management practices can affect the population dynamics of soil microbial communities. Cultural practices can be adequately combined to benefit natural populations of microorganisms that may have a role in biological control (actinomycetes, Trichoderma spp., and Gliocladium spp.), thus contributing to the management of peanut fungal soilborne diseases in a sustainable manner within ecological boundaries. During six agricultural cycles, rhizosphere soil samples were taken from a field subjected to crop rotation (soybean, peanut, and maize), peanut being under two tillage systems (no till, reduced tillage) with the aim of quantifying populations of soil microorganisms. The incidence of diseases caused by soilborne fungi in peanut was determined at harvest. The highest amount of actinomycetes, Trichoderma spp., and Gliocladium spp. were recorded when maize was the preceding crop. Regarding tillage systems, the populations of the three groups of microorganisms were higher in peanut under no tillage than under reduced tillage. Under these conditions, the lowest incidence of peanut blight (Sclerotinia minor) and root rot (strains of Fusarium solani) was observed, suggesting a possible natural control of peanut soilborne pathogens. The quantification of actinomycetes, Trichoderma spp., and Gliocladium spp. was used as a tool to explore the impacts of different management systems on microbial groups that may be involved in the biological control of soilborne diseases, with the aim of combining those practices that improve native populations of possible beneficial microorganisms. This manipulation can provide sustainable management strategies in the control of soilborne diseases, avoiding the use of artificial inoculations of microorganisms, and reducing agrochemical application.Fil: Vargas Gil, Silvina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Instituto Nacional de Tecnología Agropecuaria. Centro de Investigación En Ciencias Veterinarias y Agronomicas. Instituto de Fitopatología y Fisiología Vegetal; ArgentinaFil: Meriles, Jose Manuel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto Multidisciplinario de Biología Vegetal. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas Físicas y Naturales. Instituto Multidisciplinario de Biología Vegetal; ArgentinaFil: Haro Juarez, Ricardo Javier. Instituto Nacional de Tecnología Agropecuaria. Centro Regional Córdoba. Estación Experimental Agropecuaria Manfredi; ArgentinaFil: Casini, Cristiano. Instituto Nacional de Tecnología Agropecuaria. Centro Regional Córdoba. Estación Experimental Agropecuaria Manfredi; ArgentinaFil: March, Guillermo Juan. Instituto Nacional de Tecnología Agropecuaria. Centro de Investigación En Ciencias Veterinarias y Agronomicas. Instituto de Fitopatología y Fisiología Vegetal; Argentin
Land use impact on chemical and spectroscopical characteristics of soil organic matter in an arid ecosystem
Full text linkSoil organic matter (SOM) storage and composition in ecosystems may undergo change as a result of long-term livestock and soil cultivation, particularly in arid environments. In this work, we evaluated the alterations produced in both the quantity and quality of SOM due to productive management systems. The impact of land use change on SOM, dissolved and hot water-extractable carbon (DOC and HWC), humic substances (HS), humic acids (HA), fulvic acids (FA) and the infrared and visible spectroscopy of HS were studied at three productive sites: total and selective clearings with livestock (TC livestock and SC livestock), total clearing with irrigated agriculture (TC agriculture), and an undisturbed site located in central-western Argentina. The SOM content was higher at the undisturbed and TC agriculture sites. DOC varied among the study sites only during the dry season, while HWC decreased during the wet season, clearly indicating the lability of this fraction. The concentrations of HS, HA, and FA were reduced (50–75 %) by land use change, with the HS composition determined by infrared spectroscopy reflecting a high quantity of polysaccharides in TC agriculture, while the E4/E6 ratio (UV–vis) presented low values at the undisturbed site, indicating a high degree of condensation of aromatic substances. In conclusion, (a) the conversion of native woodlands to livestock systems favored soil C losses, (b) the highest SOM storage recorded in TC agriculture may reflect a greater residue accumulation at the soil surface and (c) the combination of different techniques provided a very good insight into the status of soil degradation.Fil: Vázquez, Carolina. Universidad Nacional de Córdoba. Facultad de Ciencias Agropecuarias. Departamento de Recursos Naturales. Cátedra de Microbiología Agrícola; ArgentinaFil: Iriarte, Ana Graciela. Universidad Nacional de Cordoba. Facultad de Ciencias Quimicas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Físico-química de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Investigaciones en Físico-química de Córdoba; ArgentinaFil: Merlo, C.. Universidad Nacional de Córdoba. Facultad de Ciencias Agropecuarias. Departamento de Recursos Naturales. Cátedra de Microbiología Agrícola; ArgentinaFil: Abril, Adriana. Universidad Nacional de Córdoba. Facultad de Ciencias Agropecuarias. Departamento de Recursos Naturales. Cátedra de Microbiología Agrícola; ArgentinaFil: Kowaljow, Esteban. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto Multidisciplinario de Biología Vegetal. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas Físicas y Naturales. Instituto Multidisciplinario de Biología Vegetal; ArgentinaFil: Meriles, Jose Manuel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto Multidisciplinario de Biología Vegetal. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas Físicas y Naturales. Instituto Multidisciplinario de Biología Vegetal; Argentin
Short-term impact of olive mill wastewater (OMWW) applications on the physico-chemical and microbiological soil properties of an olive grove in Argentina
Full text linkThe purpose of this work was to investigate the effects of spreading olive oil mill wastewater (OMWW) on soil biochemical parameters and olive production in an organically managed olive orchard. The experiment was carried out with three different doses of OMWW (80, 160 and 500 m3 ha-1) and a control (untreated soil). Three samplings were done at 10, 30 and 90 days after the administration of the byproduct. OMWW application differentially modified the biochemical properties of the soil analyzed. Organic matter, organic carbon, total nitrogen and extractable phosphorus soil contents increased proportionally with each increasing dose. The values of these parameters decreased gradually with time. Total microbial activity was altered and the OMWW 500 m3 ha-1 treatment proved to be the most active when compared with the other applied doses. OMWW agricultural application also modified the structure of soil microbial communities, particularly affecting Gram positive and negative bacteria, while fungal biomass did not show consistent changes. Although there was a salinity increase in the treated soil, especially at the highest dose, the productive parameters analyzed (fruit and oil tree-1) were not affected. In light of the obtained results, we consider that low dose of OMWW could be considered an alternative farming practice for semiarid regions.Fil: Pierantozzi, Pierluigi. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Córdoba. Instituto Multidisciplinario de Biología Vegetal (p); Argentina. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas, Físicas y Naturales; ArgentinaFil: Torres, Mariela Analía. Instituto Nacional de Tecnología Agropecuaria; ArgentinaFil: Verdenelli, Romina Aylen. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Córdoba. Instituto Multidisciplinario de Biología Vegetal (p); Argentina. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas, Físicas y Naturales; ArgentinaFil: Basanta, María . Instituto Nacional de Tecnología Agropecuaria; ArgentinaFil: Maestri, Damian. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Córdoba. Instituto Multidisciplinario de Biología Vegetal (p); Argentina. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas, Físicas y Naturales; ArgentinaFil: Meriles, Jose Manuel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Córdoba. Instituto Multidisciplinario de Biología Vegetal (p); Argentina. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas, Físicas y Naturales; Argentin
Selected soil-borne fungi under Glyphosate application and crop residues from a long-term field experiment
Full text linkA study was carried out to determine the short-term effects of glyphosate and crop residues on the population dynamics of soil-borne fungi under field conditions. Field experiments were conducted during two growing seasons. The assays were done in plots that were subjected to a peanut (Arachis hypogaea)-corn (Zea mays)-soyabean (Glycine max) rotation system with two sequences: corn-soyabean-peanut and soyabean-corn-peanut. Soil samples were randomly collected from a peanut-corn-soyabean rotation field located at Córdoba province (Argentina) in order to quantify native populations of Fusarium, Pythium, Trichoderma, Gliocladium and culturable total fungi populations. Independently of the present crop, the highest population of Trichoderma and Gliocladium were recorded in soil with corn residue. Pythium populations increased after glyphosate treatment. Trichoderma, Gliocladium and culturable total fungi populations were not affected by glyphosate applications. Information on the actual time and duration of population responses of various important soil-borne fungi after glyphosate treatment is currently limited since it is dependent on numerous parameters such as soil condition, type of hosts involved and soil microbial interactions. The use of corn residue appeared as an interesting alternative to increase the population of potential antagonistre fungi, and reduce crop diseases; therefore more field research along this line is clearly needed.Fil: Meriles, Jose Manuel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto Multidisciplinario de Biología Vegetal. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas Físicas y Naturales. Instituto Multidisciplinario de Biología Vegetal; Argentina. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas Físicas y Naturales. Instituto de Ciencias y Tecnología de los Alimentos; ArgentinaFil: Vargas Gil, Silvina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Instituto Nacional de Tecnología Agropecuaria. Centro de Investigación en Ciencias Veterinarias y Agronómicas. Instituto de Fitopatología y Fisiología Vegetal; ArgentinaFil: Haro Juarez, Ricardo Javier. Instituto Nacional de Tecnología Agropecuaria. Centro Regional Córdoba. Estación Experimental Agropecuaria Manfredi; ArgentinaFil: March, J. G.. Instituto Nacional de Tecnología Agropecuaria. Centro de Investigación en Ciencias Veterinarias y Agronómicas. Instituto de Fitopatología y Fisiología Vegetal; ArgentinaFil: Guzman, Carlos Alberto. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas Físicas y Naturales. Instituto de Ciencias y Tecnología de los Alimentos; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentin
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