Organic Farming

Because of the need to search for environment-friendly and non-hazardous method of weed control, Calumpang (NCPC) conducted a study which screened 12 plants for herbicidal effects and assessed the selectivity and potency of such extracts.

Extracts of the following plants believed to have medicinal values were utilized in the study: (1) Blumea balsamifera; (2) Brussionetia papyrifera; (3) Cinnamomum mercadoi; (4) Coccinia grandis; (5) Dature metel; (6) Jatropha gossypifolia; (7) Melia dubia; (8) Moringa oleifera; (9) Tephrosia vogelli; (10) Thunbergia grandiflora; (11) Tinospora rumphii; and (12) Zingiler cassumunar.
The extracts of the 12 test plants were subjected to bioassay tests and observed for any root inhibition.
Initial screening showed that C. mercadoi, C. grandis and T. rumphii contained active compounds which inhibited root growth and consequently caused test plants to die. The observed inhibition was comparable to low levels of 2,4-D, a popular commercial herbicide.
The study revealed that these plants could be good sources of organic compounds. These could be synthesized and used to replace present day synthetic compounds which not only contaminate the environment, but also affect non-target organisms.

Source: PCARRD, 1998. Highlights 1997, Los Banos, Laguna.

Today is May 17, 2006
	Promising Plant Extracts Against Weeds
	Because of the need to search for environment-friendly and non-hazardous method of weed control, Calumpang (NCPC) conducted a study which screened 12 plants for herbicidal effects and assessed the selectivity and potency of such extracts. Findings Extracts of the following plants believed to have medicinal values were utilized in the study: (1) Blumea balsamifera; (2) Brussionetia papyrifera; (3) Cinnamomum mercadoi; (4) Coccinia grandis; (5) Dature metel; (6) Jatropha gossypifolia; (7) Melia dubia; (8) Moringa oleifera; (9) Tephrosia vogelli; (10) Thunbergia grandiflora; (11) Tinospora rumphii; and (12) Zingiler cassumunar. The extracts of the 12 test plants were subjected to bioassay tests and observed for any root inhibition. Initial screening showed that C. mercadoi, C. grandis and T. rumphii contained active compounds which inhibited root growth and consequently caused test plants to die. The observed inhibition was comparable to low levels of 2,4-D, a popular commercial herbicide. The study revealed that these plants could be good sources of organic compounds. These could be synthesized and used to replace present day synthetic compounds which not only contaminate the environment, but also affect non-target organisms. Source: PCARRD, 1998. Highlights 1997, Los Banos, Laguna.
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Promising Plant Extracts Against Weeds