RESEARCH ON THE INFLUENCE OF CHEMICAL FERTILIZERS ON TEMPORARY SHORT-EXPLOITATION GRASSLAND

Averaged over the two years of experimentation (2012-2013) separate influence of the mixture of species on short-exploitation temporary grassland production was reduced, meaning that the production of the 4 mixtures were close. Whatever themixture, theunfertilized variant, consideredcontrol, has been acquiredvery lowproductionof only2.44tha-1 d.m. Throughfertilizationwith100 kg/haN(backgroundof 50kg/haP2O5 and50 kg/haK2O) were made5.41t ha-1 d.m., which represents an increase of2.97tha-1orin therelative numbersby122%. The dose of 120 kg/ha N applied in two rounds (80 kg in the spring + 40 kg after first harvest) increased production by 2.08 t ha-1, the amount harvested per unit area being 4.52 t ha-1d.m

THE INFLUENCE OF THE PROPORTION BETWEEN THE COMPONENTS IN TWO SIMPLE SHORT-EXPLOITATION MIXTURES

As average, for an experimental period of two years (2012-2013) the two short exploitation mixtures that represented the graduations of factor A (mixture) had the same productive capacity. The proportion between the grasses and legumes has influenced, in the same way, both the production of the Lolium perenne + Trifolium pratense pasture and the Festuca pratensis + Trifolium pratense pasture. Thus for the mixture that used Lolium perenne, the production increased to 4.88 t ha-1d.m. (ratio 75/25%) up to 6.46 t ha-1d.m. (ratio 25/75%). The increases were proved to be important and very important. For the mixture of Festuca pratensis + Trifolium pratense the productions were 5.26 t ha-1d.m.in the proportion of 75/25%, 5.56 t ha-1d.m. to 50/50% and 6.16 t ha-1d.m.at 25/75 ratio %