Evaluation of the Allelopathic Activity of Aqueous and Methanol Extracts of <i>Heliotropium indicum</i> Leaves and Roots on Eight Cucurbit Crops

Abstract

Allelopathy, a biological phenomenon where plants release chemicals that influence the growth and development of neighboring flora, offers potential natural alternatives for weed management in agriculture. This study investigated the allelopathic effects of Heliotropium indicum leaf and root extracts on the germination, growth, and biochemical parameters of eight cucurbit crops. Results demonstrated that H. indicum extracts generally inhibited seed germination across all cucurbit species, with aqueous extracts showing a stronger effect than methanol extracts in Lagenaria siceraria at 10.66 ± 0.46% (p Benincasa hispida’s shoot length was significantly reduced, compared to the control, at 2.1 ± 0.14 cm (p Momordica charantia (p L. siceraria p H. indicum extracts as natural herbicides and biostimulants, though their effects are species-specific and dependent on concentration. This research contributes to understanding the complex interactions in plant allelopathy, and highlights the potential of plant-derived extracts in sustainable agriculture.

Keywords

• allelopathy
• hatisur
• cucurbit crops
• seed germination
• chlorophyll content
• malondialdehyde (MDA) levels