ABSTRACT.- Long-term agricultural experiments (LTE) are essential to detect cumulative treatment effects on soil properties and to design sustainable production systems. However, to ensure high quality of long-term soil data and their correct interpretation, several analytical issues regarding the accuracy and analytical laboratory bias need to be considered.

ABSTRACT.- Long-term agricultural experiments (LTE) are essential to detect cumulative treatment effects on soil properties and to design sustainable production systems. However, to ensure high quality of long-term soil data and their correct interpretation, several analytical issues regarding the accuracy and analytical laboratory bias need to be considered.

The objective of the present paper is to review and update the experimental results and the model predictions about soil erosion and SOC content changes in Argiudolls of Uruguay.

ABSTRACT.- The expansion of olive orchards into regions with no tradition of olive production and humid climates, such as Uruguay, with more than 1200 mm of annual rainfall, calls into question the need for irrigation. In these regions, however, years with water deficit during summers are quite common. The vapor pressure deficit during summer is lower than in countries with a Mediterranean climate.

El objetivo general de este estudio es cuantificar el efecto de distintos niveles de FDN de dietas forrajeras, sobre las emisiones de CH4 entérico de novillos en terminación. Para lograr este objetivo se plantearon los siguientes objetivos específicos:i. Identificar el efecto de distinta calidad de dieta sobre el consumo y la ganancia de peso diario; y ii. Cuantificar las emisiones de CH4 según el contenido de FDN dela dieta suministrada.

ABSTRACT. - Short-term solutions like increasing N fertilization and decompaction with deep tillage (DT) have been proposed to mitigate soil degradation in continuous cropping systems. However, the joint evaluation of these factors in established no-till systems is limited. This work aims to quantify corn yield losses generated by the cumulative degradation of soil quality of intensified no-till cropping systems, quantify to what extent yield losses could be mitigated by soil DT and N fertilization, and identify the most important process involved in yield reductions.

ABSTRACT. - Insect epicuticle hydrocarbons (CHC) are known to be important determinants in the susceptibility degree of insects to fungal entomopathogens.

ABSTRACT - Manual static chamber is one of the most widespread methods for the quantification of greenhouse gases (GHGs) emissions from agricultural systems. But there are concerns about the reliability of measurements and a necessity to assess the static chambers used in the studies performed in the countries of Latin America. Thus, this study aims to investigate the quality of the characteristics from the static chamber methodology, the confidence level of the GHG measurements, and recommend what should be improved.