Grassland productivity in the inferior hydrographic basin of Motru river

The permanent grasslands of the lower basin of Motru river are particularly valuable, expressed in phytodiversity and productivity. The average number of cormophyte species is 117 in the 12 associations with 116 surveys. The most species were found in the associations Festucetum rupicolae (191), Festuco rubrae - Agrostetum capillaris (168) and Festucetum valesiaco-rupicolae (143 species). The participation of forage species in the grassy carpet reaches 66%, directly influencing productivity. The average production of forage green mass (GM) was evaluated at 10.31 t/ha with a pastoral value (PV) of 52.1 which can provide 4390 liters of cow's milk in 160 days grazing season from grass alone. The most valuable are grassland of the association Trifolio repenti - Lolietum perennis in the grassland of this river, which have a production of over 25 t/ha GM and 93 PV index. The most degraded are the grassland in the Caricetum hirtae association with almost 1 t/ha GM and 6 PV index. At the phytosociological alliance (habitat) level, the production of cow's milk was established, which is almost 7700 liters per hectare in Trifolio repenti - Lolietum perennis with a loading of 1.73 LU/ha, association imitated and cultivated with improved varieties on the surfaces throughout western Europe with good humidity.