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handle: 10261/37122
[ES] Se studia la variación en la concentración de Ca y Al en los pastizales de una dehesa de la provincia de Salamanca, efectuando tomas de muestras mensuales en el período de septiembre 1978 - octubre 1979. Las concentraciones máximas para ambos elementos se alcanzan en el período de inicio de primavera y las mayores fluctuaciones también en esta estación y durante el invierno. Para Co se encuentra una concentración media de 0,157 ppm con márgenes de variación de 0,045-0,548 ppm y para Al de 307 ppm con valores extremos de 38-3.750 ppm. Finalmente puede afirmarse que el 21 % de las muestras consideradas, no alcanzan el nivel de 0,10 ppm de Co, mínimo señalado por la bibiografía en una nutrición adecuada de rumiantes.
[EN] The variation in the concentration of CO and AI of a "dehesas" of Salamanca province is studied taking monthly samples within the period 1978 september 1979 october. The maximum concentrations are reached for both elements at the beginning of Spring and the major fluctuations also occur during this season and Winter. There is a mean concentration of 0.157 ppm with 0,045-0,548 ppm variation margins for Co, and of 307 ppm with 38-2.750 ppm extreme values for Al Finally, it ran be said that the 21 % of the studied sampled does not reache the 0.10 ppm level of Co, the minimum set up by bibliography for a proper ruminants mourishment.
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