@article{Wicki:233522,
      recid = {233522},
      author = {Wicki, Ludwik},
      title = {Regionalne zróżnicowanie zużycia kwalifikowanego materiału  siewnego w Polsce i jego zmiany  w latach 2004-2014},
      journal = {Roczniki (Annals)},
      address = {2015-12},
      number = {1230-2016-99882},
      year = {2015},
      abstract = {The aim of the study is to determine changes in the level  of consumption of certified seed of cereals in
Poland in  the years 2000-2014 and to determine if there is  convergence of level of consumption of certified
seeds by  provinces in Poland. The analysis covered the period  2004-2014 and statistical data of CSO of
Poland were used.  It was found that the level of consumption of certified  seed of cereals in agriculture in
Poland has remained at  level of about 170 thousand tonnes per year and per 1 ha of  cereals production it
is level of 30 kg. The diversity of  use of the certified seeds between the regions ranged from  10 to 70 kg/ha,
and for particular species it was from 14  kg per hectare for rye to 50 kg/ha for spring wheat. For  the level
of consumption of certified seed the existence of  beta convergence and sigma convergence were found  for
regions, but these relations were not statistically  significant. Only in the case of spring wheat and  spring
barley there were found beta convergence, and for  oats and triticale beta divergence occurred. In  Poland,
still maintains a strong regional differences in  the level of consumption of certified seed.},
      url = {http://ageconsearch.umn.edu/record/233522},
      doi = {https://doi.org/10.22004/ag.econ.233522},
}