Page 67 - Abstract book - TJSSF-2020

Thailand – Japan Student Science Fair 2020 (TJ-SSF 2020)
“Seeding Innovations through Fostering Thailand – Japan Youth Friendship”

The Degree of Igusa's Allelopathic Effects on Lettuce
(Make Natural Pesticide from plants)

Funatsu Kanon , Nakata Shion , Mitsuuchi Kou
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Tennoji Senior High School
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Abstract
These days, more and more farmers are using herbicides to protect crops from weeds, which deprive
nutrition that crops need. Using more herbicides, however, might have a negative impact on aquatic,
soil biota and human health in the future. As a strategy for weed management, Allelopathy can be used.
This could eliminate the use of synthetic chemicals for this purpose. Allelopathy is the effect caused by
release of toxic chemical substances when a plant dies and is dried. We regarded Igusa as a material of
a natural herbicide. That does not contain any chemical toxics. That is why Igusa can be used as an
alternative to existing herbicides. This research discusses the power of Igusa's allelopathy on a lettuce.
We hypothesized is that Igusa's allelochemical would be strong enough to scramble over lettuce's
growth. We made floral water from dried Igusa to find to what extent Igusa affects lettuce's species.
Through these experiments, we found that Igusa significantly reduces the growth of lettuce.

Keywords: allelopathy, natural herbicie, Igusa, allelochemical

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