THE ALLELOPATHICITY OF RED SPRANGLETOP (Leptochloa chinensis L.) AGAINST GERMINATION AND SEEDLING GROWTH OF RICE (Oryza sativa L.)

Red sprangletop (Leptochloa chinensis L.) is a problematic weed of aerobic rice (Oryza sativa that greatly reduces in yield. The laboratory studies were undertaken to confirm allelopathicity its plant leachates and soil-decomposition residues towards emergence seedling growth rice. In first experiment, aqueous extracts from various parts red (stem, root, leaves, flower entire plant) at their 5% (w/v) concentration applied germinating seeds. second soil-decomposed variable concentrations (2, 4 6% w/w) used as germination media for Among parts, leaves showed maximum allelopathic effect by fully inhibiting the while stem could be positioned situation it caused 60, 73, 84.13 86 % reductions percentage, index, length dry biomass compared with control, respectively. This treatment also resulted delays mean time (up 4.80 days) days taken 50% 4.40 highest concentrated (6%) residue significantly diminished vigor index 35.13, 23.26 41.61% lower than control. It very well may presumed liquid concentrates leave had different kind allelochemicals inhibited germination, development