%0 Journal Article %@ 1588-385X %A Debreczeni Katalin %A Berecz Katalin %D 2002 %F acta:22556 %J Acta biologica Szegediensis %K Természettudomány, Biológia %N 3-4 %P 195-196 %T Cumulative yield surplus of grain crops as an effect of NPK-fertilisation studied in long-term field experiments %U http://acta.bibl.u-szeged.hu/22556/ %V 46 %Z Bibliogr.: 196. p.