Nutritive value of grassland plants. 3. Calcium, phosphorus, magnesium and potassium contents | Valeur nutritive des plantes des prairies 3. Teneurs en calcium, phosphore, magnesium et potassium
2001
Daccord, R. | Arrigo, Y. | Kessler, J. (Station federale de recherches en production animale (RAP), Posieux (Switzerland)) | Jeangros, B. | Scehovic, J. (Station federale de recherches en production vegetale de Changins (RAC), Nyon (Switzerland))
The calcium (Ca), phosphorus (P), magnesium (Mg) and potassium (K) contents were analysed in 10 important species of grassland plants. The analysis results of more than 500 samples give a better knowledge about the influence of species, age and stage of development. The Ca content is clearly higher in the groups of legumes (15,1 +/- 2,5 g/kg DM) and herbs (13,7 +/- 4) than in grasses (3,7 +/- 1,1). The age and the stage of development have little effect. On average, the P concentration is similar in grasses and legumes (3,6 +/- 0,8 and 3,4 +/- 0,6 g/kg DM) and higher in herbs (4,9 +/- 0,9). The effect of age and stage of development is important, especially for grasses. The mean concentration of Mg is the highest in herbs (3,2 +/- 1 g/kg DM), followed by legumes (2,3 +/- 0,5) and grasses (1,7 +/- 0,5). The growing cycle has an effect on the Mg content, whereas the age and the stage of development have only little influence. On average, the K content is almost the same for grasses and legumes (31,8 +/- 6,4 and 31,1 +/- 5,2 g/kg DM), but higher for herbs (45,8 +/- 6,8). It is mostly determined by the growing cycle, the age and the stage of development.
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