CREEPING THISTLE (CIRSIUM ARVENSE (L.) SCOP.) – AN IMPORTANT COMPETITOR OF NUTRIENTS CONSUMPTION IN GRAIN MAIZE STANDS (ZEA MAYS L.)
2007, 8 (4) p. 461-468
The aim of this research was to compare the competition ability of creeping thistle to grain maize stands during vegetation period, to establish the nutrient equivalents according the elements content in plants and to find out the coherence between competitive relations of grain maize and creeping thistle. In 2002 – 2004 nutrient equivalents of creeping thistle (Cirsium arvense (L.) Scop.) in grain maize stands (Zea mays L.) were researched on experimental fields of Slovak University of Agriculture in Nitra (locality Nitra – Dolná Malanta). The ratio between nutrient content (N, P, K, Ca, Mg) in dry mass weight of creeping thistle and nutrient content (N, P, K, Ca, Mg) in dry mass weight of grain maize was compute as nutrient equivalent. The creeping thistle has shown the higher competitive ability against grain maize expressed as nutrient equivalent in May 2004 (soil dryness condition). It declined about in order June 2003 → June 2004 → May 2003 → May 2002 → June 2002. Creeping thistle with comparison to grain maize absorbed in average 1.09 – 1.65 N, 1.12 – 1.16 P, 0.87 – 2.51 K, 2.59 – 11.29 Ca and 0.82 – 1.74 Mg (table 3). Ca was the most drawn element from soil during all observed period 2002 – 2004. The competitive ability of creeping thistle in grain maize was the highest in water deficit conditions mainly, lower competition ability was recorded in sufficient soil moisture conditions. Nutrients absorption by grain maize and creeping thistle was affected by an individual climatic characteristics in each year.