Labelling fish diets with N -Leucine for monitoring feed consumption and bio-distribution in Atlantic salmon.

Feeding represents 50-70% of the cost of production in salmon farming, higher than any other animal farm. The improvement of this percentage is challenging as the food is thrown into the fish tank, there is no quantification of the amount of food that is consumed by the fish. In consequence, it is difficult to adjust the food composition making it more nutritive or promoting food consumption by fish.

Assessment of runoff using Be in vineyards in the central valley of Chile.

In Chile, erosion processes (on-site and off-site impact) affect at least 36.9 million ha, representing 49% of the total land area. Different regions show severe soil degradation mainly caused by water erosion processes.

Absorption and distribution of root, fruit, and foliar-applied Ca in 'Clemenules' mandarin trees.

Background: The mechanisms of calcium (Ca) absorption and transport in plants are still poorly understood. This study focused on assessing the absorption and distribution of Ca in different plant organs after root (soil), foliar, or fruit application to 6-year-old 'Clemenules' mandarin trees, grown in pots, using Ca as a tracer.

Results: The rate of Ca absorption and transportation in plant tissues varied according to the treatment method.

Pesticide risk management using indicators for vineyards in the central valley of Chile.

The Apalta catchment is a wine-producing area of 1300 ha, lying south of Santiago, located in the Colchagua Valley, near Santa Cruz in the VI Region of Chile. The vineyards are planted on slopes of up to 22 degrees, the rows being aligned mainly down the slope. This cropping system and its management lead to a potential contamination of natural resources.