Saline effects on forage growth and quality
2008
Oliveira, M.M.; Carmona, M.A.; Santos, M.J., Estação Agronómica Nacional, Oeiras (Portugal). Departamento de Fisiologia Vegetal
Birdsfoot trefoil (Lotus corniculatus L.) and tall fescue (Festuca arundinacea Schreb.) plants were grown hydroponically in pots (NFT system), with four NaCl levels: 0, 44, 87 and 174 mM (corresponding to 1, 4, 8 and 16 dS per m). Plants shoot dry weight, amino acids, proline and mineral content were analysed after 35, 78, 121 and 148 days of saline treatment. In the last sampling, dry weight was reduced in 44 per cent and 77 per cent , with respect to control, in birdsfoot trefoil and tall fescue, respectively, with higher salinity. At the first harvest, dry matter formation was correlated with Kplus (r equal to 0.96) in the former and with Ca2plus (r equal to 0.91) in the second species. The chloride content in dry matter increases with time of exposure and salinity level in both species, with a higher rate accumulation in birdsfoot trefoil. In tall fescue proline and sucrose contents were twice as high and well related with sodium (r equal to 0.92) and chloride (r equal to 0.98), respectively
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