This study aimed to quantify the effect of dairy cattle urine N on soil NH4+, NO3-, pH, as well as on nitrous oxide emissions in a mixed pasture soil. The study was conducted at the dairy unit of INIA - La Estanzuela, Colonia, Uruguay (34°21'04.2"S 57°41'32.4"W). The experiment was arranged as a complete block randomized statistical design (CRBD) with 4 repetitions.

El objetivo de este trabajo fue comparar la producción de forraje estacional y anual de alfalfa pura y consociada con diferentes cultivares de festuca alta. El trabajo se realizó en la Estación Experimental INIA La Estanzuela, Colonia, en el período 2015-2020, sobre un suelo brunosol éutrico típico (pH 5,7, MO 3,2%, y fósforo disponible 28 ppm).

The objective of this study was to determine to what extent the inclusion of medium and high tannin content legumes in NG affects the excretion of N in feces and urine of beef heifers compared to NG without legumes. The experiment was carried out at the Research and Experimental Center Dr. A. Gallinal (CIEDAG-SUL), Uruguay, from 20/10/21 to 22/11/21.

The objective of this work was to determine to what extent the inclusion of legumes with different tannin contents in native grasslands (NG) affect the N2O emissions from beef cattle urine. The experiment was conducted at the Research and Experimentation Center Dr. A. Gallinal, Uruguay.

Toxic cyanobacterial blooms are globally increasing with negative effects on aquatic ecosystems, water use and human health. Blooms? main driving forces are eutrophication, dam construction, urban waste, replacement of natural vegetation with croplands and climate change and variability. The relative effects of each driver have not still been properly addressed, particularly in large river basins. Here, we performed a historical analysis of cyanobacterial abundance in a large and important ecosystem of South America (Uruguay river, ca 1900 km long, 365,000 km2 basin).

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.

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).

Contenido. Síntesis de la Situación Agroclimática de Febrero-- Perspectivas Climáticas Trimestrales elaboradas por el IRI de la Universidad de Columbia (Más información puede encontrarse en el sitio del IRI:http://www.iri.columbia.edu) -- Índice de Vegetación (NDVI) -- Precipitaciones -- Porcentaje de Agua Disponible (PAD) -- Agua No Retenida (ANR) -- Índice de Bienestar Hídrico (IBH) -- Perspectivas Climáticas Mar-Abr-May elaboradas por el IRI de la Universidad de Columbia. Destacamos para este mes:Balance Hídrico de Cultivos.