ANALYZE OF DIFFERENT CROPPING SYSTEMS AND YEAR CONDITIONS ON GRAIN YIELDS AND THOUSAND-KERNEL WEIGHT OF PEA (PISUM SATIVUM L.)

In the 1998 - 2007 years we observed the effect of two different cropping systems (conventional and ecological) and year conditions on yield height and thousand-kernel weight of pea (Pisum sativum L.). The study was carried out in the stationary field experiment established in the year 1990 at Borovce near Piešťany town (western part of the Slovak Republic) on a loamy luvi-haplic Chernozem in the area with a continental climate. The experimental design consists in a split plot arrangement with four replications (during the years 1999-2002) eventually two replications (during the years 2003-2007). There were six crops in the crop rotation: maize for grain – spring barley – winter wheat - spring barley – pea - winter wheat. The model variety of pea was variety Olivin in the years 1998-2002 and Achat in the years 2003-2007. Both varieties are green seed varieties well-bread at the breeding station in Horná Streda, Slovakia. The average yield in the experiment was 2.71 t/ha during the years 1998-2007. The yields of pea were statistically significantly (** P0.05) influenced by year and farming system. Within the years 1998-2007 the statistically higher (** P0.05) yields were investigated in the conventional system than in the organic system. The more modern variety Achat (grown in the years 2003-2007) had higher yields than the variety Olivin (grown in the years 1998-2002). The difference represents 13.4 %. Thousand-kernel weight was statistically significantly influenced by year (** P0.05). The farming system did not statistically significantly influence the values of TKW in the experiment