Regional diversification of plant production in Poland in relation to the integration with the European Union

abonos agricultura agriculture amendement calcique arable soils consommation consumo consumption crop yield empleo emploi employment engrais enmiendas calizas european union countries farm size fertilizers integration liming materials mais maize meat production papa plant production poland pologne polonia pomme de terre potatoes production de viande rendement des cultures rendimiento de cultivos sol arable solanum tuberosum statistical data suelos cultivables surface surface area taille de l'exploitation agricole zea mays