Crude Extract from Tamarind (Tamarindus indica L.) Husk, Lemongrass (Cymbopogon citratus Stapf.) and Citronella (Cymbopogon nardus Rendle.) Residues Inhibited Seed Germination and Growth of Popping pod (Ruellia tuberosa Linn.)
Keywords:
allelopathy, bioherbicide, methanolic extractAbstract
The objective of this research was to investigate the efficacy of extracts from tamarind husk, lemongrass and citronella residues to inhibit seed germination and growth of popping pod. All residues were extracted with water and 80% methanol and subjected to germination and seedling growth bioassay in Petri dish at concentrations of 0, 1.25, 2.5, 5 and 10%. The results showed that aqueous and methanolic extracts from 3 residues could inhibit the germination and growth of popping pod. The crude extract from 80% methanol had higher inhibitory effect on germination and growth than the aqueous extract with more effective inhibition when the concentration had been increased. Methanolic extract from lemongrass and citronella at the concentration of 10% showed the best inhibitory effects. In conclusion, lemongrass and citronella extracts might be a safe alternative for popping pod control to reduce the use of synthetic herbicides.
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