Allelopathic effect of winter oilseed rape residues on Chenopodium album l. germination and early growth

Experiments were conducted at Experimental Station and Laboratory of Agroecosystems and Soil Science Institute of the Aleksandras Stulginskis University in 2011. The aim of investigations was to evaluate the allelopathic effect of aqueous extracts of winter oilseed rape residues (threshing remains, stubble and roots) on Chenopodium album L. germination and early growth. Treatments of the investigations: Factor A – winter oilseed rape residues: 1) threshing remains, 2) stubble, 3) roots; Factor B – concentrations of aqueous extracts: 1) distilled water, 2) 1:6250 (ratio of oilseed rape residues and water), 3) 1:1250, 4) 1:250, 5) 1:50, 6) 1:10. Chenopodium album L. was grown on filter paper moistened with the prepared aqueous extracts in Petri dishes, in a climate chamber. Studies of winter oilseed rape residues that have been decomposing in the soil for 3 months revealed that Chenopodium album L. seed germination was significantly stimulated by threshing remains extracts at 1:6250 and roots extracts at 1:1250 concentrations, compared with distilled water. Aqueous extracts of the winter rape threshing remains at the concentrations of 1:6250, 1:1250, 1:250 and 1:10 and of roots of the highest concentration (1:10) stimulated the growth of weed shoots, compared with the same concentrations of other residues extracts. The growth of Chenopodium album L shoots was significantly stimulated by the aqueous extracts of winter oilseed rape threshing remains and roots at the highest concentrations (1:10 and 1:50) to compare with distilled water. It was estimated that the growth of roots of the Chenopodium album L. is suppressed by the winter oilseed rape stubble aqueous extracts at the concentrations 1:250, 1:50 and by winter oilseed rape threshing remains aqueous extracts at the 1:1250 concentration to compare with extracts of other residues at the same concentrationsVytauto Didžiojo universitetasŽemės ūkio akademij