8 pages, 6 figures, 2 tables.-- V Seminario de Química Marina, Cádiz, 23-24 enero 1990 | [EN] An analytical method for the determination of calcium ion in seawater is proposed, by volumetric titration with potentiometric detection of end-point by calcium ion selective electrode, using EGTA (ethyleneglycol-bis (B-aminoethylether), N, N, N', N’, tetraacetic acid) as a titrant, which produces least interference with other alkaline ions. The ammount of added borax is eminently good for buffering the pH during the titration. The method was applied to the study of two legs performed in Ria de Arosa, during the cruise GALICIA X. A reproductibility of 0.04% was obtained, better than other methods with potentiometric end-point or colorimetric indicators | [ES] Se propone un método analítico para la determinación de ión calcio en agua de mar, por valoración volumétrica, con detección potenciométrica del punto final mediante electrodo selectivo al ion calcio, usando el agente complejante EGTA (ácido etilenglicol-bis- (2-aminoetileter)-N, N, N', N', tetraacético), que hace mínima la interferencia con otros iones alcalinotérreos. La cantidad de bórax añadido resulta óptima para tamponar el pH durante la titulación. El método se aplicó al estudio de dos cortes realizados en la Ría de Arosa, durante la campaña oceanográfica GALICIA X. La reproducibilidad obtenida fue de 0,04%, superior a la obtenida en otros métodos con punto final potenciométrico o con indicadores colorimétricos | No

0 consumo de água, assumido como sendo igual à Evapotranspiração Máxima (ETm) e o Coeficiente de Cultura (Kc) do sorgo sacarino foram estimados com base nas medidas de Etin realizadas em evapotranspirômetro de nível de água constante e da Evapotranspiraçáo de Referência (ETo) calculada pelos métodos de Penman, Classe A e Radiação. A ETm no cicio de 130 dias foi da ordem de 460 min. Os valores de Kc, correspondentes aos estágios iniciais do desenvolvimento da cultura e aos valores máximos, foram semelhantes aos recomendados pela FAO. No final do ciclo os valores estimados de Kc foram superiores aos da FAO em cerca de 30%. Foi observada estreita correlação entre a ETm (mm/dia) e o índice de Área Foliar (IAF) da cultura. A eficiência de uso de água foi da ordem de 56,7 Mg/ha/dia.

Introductory notes in Spanish, Catalan and English. Text in Spanish

An experiment was carried out in order to evaluate the alpaca's nutritional behavior, by determining the digestibility of a diet under different nutritional requirements according to the literature estimates. Alfalfa hay and maize straw was utilized in four treatments; a control treatment supplying 100% of the energetic and protein maintenance requirements; the second treatment included 85% of the protein requirement for maintenance; the third one, supplying 85% of the energy requirement for maintenance, and the fourth treatment, covering a 85% of the energy and protein requirements. A second trial was carried out to evaluate the digestibility of different quality feeds under 100% of maintenance requirements. The trial had two treatments, one of which corresponded to the control treatment of the first trial with alfalfa hay and maize straw, and the second one with ground raspberry shoots and maize straw. Additionally, water intake was determined to study its relationship with feed intake.