Global water resources are under increasing pressure, and some regions face the need to retire irrigation due to groundwater depletion or to meet governmental regulations. In arid and semiarid climates, irrigated lands tend to have more soil organic carbon (SOC) than non-irrigated croplands. However, little is known about how SOC might change following irrigation retirement. Our objective was to quantify changes in SOC and nitrogen stocks after irrigation retirement in semiarid agroecosystems of the High Plains.

In a previous study, we evaluated the degree of virulence of Mycobacterium avium subsp. paratuberculosis (Map) strains isolated from cattle in Argentina in a murine model. This assay allowed us to differentiate between high-virulent MapARG1347 and low-virulent MapARG1543 strains. To corroborate whether the differences in virulence could be attributed to genetic differences between the strains, we performed Whole Genome Sequencing and compared the genomes and gene content between them and determined the differences related to the reference strain MapK10.

Pseudomonas spp. isolates were collected from tomato plants showing symptoms of pith necrosis during the 2017 and 2018 seasons in the Salto Department, northwest Uruguay. According to physiological, biochemical tests and multilocus phylogenetic analysis (gyrB, rpoD, and rpoB), 25 were characterized as P. mediterranea, five as P. viridiflava, three as P. corrugata, and one as P. marginalis. All of them produced necrotic lesions and pith hollowing in re-inoculated tomato plants. Some P.

ABSTRACT.- Ergot disease (Claviceps paspali) and sterility have the potential to reduce seed yield in bahiagrass (Paspalum notatum Fluggé). Our objective was to determine the genotypic and environmental effects on seed yield, and the levels of ergot and sterility. Seventeen genotypes were evaluated in three locations across two years for seed yield, ergot severity, and total seed fractions (percentage of full seeds, ergot sclerotia and empty seeds).

ABSTRACT.- Ergot disease (Claviceps paspali) and sterility have the potential to reduce seed yield in bahiagrass (Paspalum notatum Fluggé). Our objective was to determine the genotypic and environmental effects on seed yield, and the levels of ergot and sterility. Seventeen genotypes were evaluated in three locations across two years for seed yield, ergot severity, and total seed fractions (percentage of full seeds, ergot sclerotia and empty seeds).

En este protocolo se presentan en detalle los materiales necesarios y el procedimiento a seguir que permitirá cuantificar las emisiones de CH4 entérico en rumiantes según la mencionada adaptación de la técnica original basada en la utilización de SF6. Se incluyen, además, las ecuaciones que permiten calcular la emisión diaria de CH4 de cada animal. CONTENIDO:1. Descripción general de la Técnica SF6 -- 2. Materiales necesarios para cada animal -- 3. Instalaciones, equipos y materiales de laboratorio -- 4. Procedimiento -- 5. Cálculo de la emisión de CH4 -- 6. Proveedores Sugeridos -- 7.

En este protocolo se presentan en detalle los materiales necesarios y el procedimiento a seguir que permitirá cuantificar las emisiones de CH4 entérico en rumiantes según la mencionada adaptación de la técnica original basada en la utilización de SF6. Se incluyen, además, las ecuaciones que permiten calcular la emisión diaria de CH4 de cada animal. CONTENIDO: 1. Descripción general de la Técnica SF6 -- 2. Materiales necesarios para cada animal -- 3. Instalaciones, equipos y materiales de laboratorio -- 4. Procedimiento -- 5. Cálculo de la emisión de CH4 -- 6. Proveedores Sugeridos -- 7.

ABSTRACT.- Achieving food security requires resilient agricultural systems with improved nutrient-use efficiency, optimized water and nutrient storage in soils, and reduced gaseous emissions. Success relies on understanding coupled nitrogen and carbon metabolism in soils, their associated influences on soil structure and the processes controlling nitrogen transformations at scales relevant to microbial activity. Here we show that the influence of organic matter on arable soil nitrogen transformations can be decoded by integrating metagenomic data with soil structural parameters.

El objetivo de este evento fue consolidar un espacio académico-técnico-político a nivel regional para la difusión e intercambio de conocimientos en torno a la restauración ecológica en el Bioma Pampa. ¿Por qué?, básicamente por dos motivos:(1) El Bioma Pampa (o Pastizales del Río de la Plata), endémico de Argentina, Brasil y Uruguay, conforma el mayor complejo de ecosistemas abiertos (pastizales, arbustales y sabanas) en América del Sur. Tiene un alto valor de conservación a nivel global, ya que los pastizales están dentro de los ecosistemas más amenazados y menos conservados del mundo.

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