Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
Abstract
The field research was carried out in the years 19931996 at the Agricultural Experimental Station of Bezek belonging to the Agricultural University of Lublin. The experiment was localized on good rye complex. The field experiment was carried out by split-plot method in four replications. The experimental plot area was 18 m2. The field experiment included four cover crops: winter rye cv. Dankowskie Zlote (240 plants per m2), winter triticale Presto (350 plants per m2), spring barley cv. Rudzik (230 plants per m2) and oat cv. Dragon (400 plants per m2), and six inter crops and control: serradella cv. Bydgoska 40 kg ha-1, white clover cv. Podkowa 10 kg ha-1, red clover cv. Hruszowska 20 kg ha-1, hop trefoil Renata 15 kg ha-1, white melilot cv. Selgo 20 kg ha-1, Dutch ryegrass cv. Motycki 40 kg ha-1. The purpose of this work was to determine which inter crops most decrease weed infestation in a canopy of cover crops in south-east region conditions of Poland. Before harvest of cover crops, weed infestation was determined with the square-frame method. The study estimated weed species composition and air dry matter of aboveground parts of weeds in two randomly selected places on every plot of half a m2 area. Winter rye decreased the number and mass of weeds in the strongest way. The highest total number and dry matter of weeds was found in a canopy of spring barley. The number and mass of weeds in cereals was not significantly limited by undersown crops. Winter rye and oats among cover crops, red clover and ryegrass from among inter crops reduced a biovariety of weeds species better. The following species of weeds dominated in a canopy of inter crops and cover crops: Chenopodium album, Agropyron repens, Matricaria maritima and Echinochloa crus-galli. The first and last of them predominated in spring cereals, the second and third in winter cereals
