Geographical variations in elemental compositions of two pesticidal plants from three agro-ecosystems in Nigeria and their wood protection potentiality
Geographical variations in elemental compositions of two pesticidal plants from three agro-ecosystems in Nigeria and their wood protection potentiality
Lawsonia inermis and Lagenaria breviflora are important tropical pesticidal plants with some
potential for industrial wood protection uses. However, little is known about their elemental
composition of wood protection importance. In this study, three agro-ecosystems: Guinea savannah
(A), Dry rainforest (B), and Fresh water swamp forest (C) were selected and from each zone
Lawsonia inermis leaves and Lagenaria breviflora fruits were collected and extracted. Six most
important elements: arsenic (As), boron (B), chromium (Cr), copper (Cu), lead (Pb) and zinc (Zn)
used to formulate outlawed standard wood preservatives, were quantitatively analysed by the
spectrophotometric method. Data were analysed using analysis of variance (ANOVA) and t-test
at α 0.05. All the elements were present in both plants, with chromium being most copious. Arsenic
concentrations were in the range of 1.05±0.04 to 1.19±0.02 mg kg-1 for L. inermis and
1.16±0.05 to 1.34±0.10 mg kg-1 for L. breviflora. Boron ranged from 1.59±0.09 to 1.75±0.06 mg
kg-1 for L. inermis and 2.15±0.24 to 3.00±0.14 mg kg-1 for L. breviflora. Chromium ranged from
28.94±0.21 to 44.15±0.13 mg kg-1 for L. inermis and 0.63±0.05 to 21.55±0.47 mg kg-
1 for L. breviflora.
Copper ranged from 2.55±0.17 to 11.35±0.17 mg kg-1 for L. inermis and 9.94±0.21 to
15.83±0.17 mg kg-1 for L. breviflora. Lead ranged from 21.36±0.44 to 22.86±0.11 mg kg-1 for
L. inermis and 19.41±0.33 to 32.50±0.47 mg kg-1 for L. breviflora. Zinc ranged from 2.35±0.19 to
21.85±0.19 mg kg-1 for L. inermis and 6.18±0.10 to 7.10±0.14 mg kg-1 for L. breviflora. Lawsonia
inermis and Lagenaria breviflora from Dry rainforest had significantly high pesticidally relevant
elements, producing extracts that could be best explored as bio-preservatives for wood protection.
Further research covering all the agro-ecosystems with individual and extract synergising
tests against wood degrading agents are suggested.
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