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Effects
of sunflower (Helianthus annuus L.) extracts on
wheat (Triticum aestivum L.) and physicochemical
characteristics of soil
Javed Kamal* and Asghari Bano
Department of Plant Sciences, Faculty of Biological Science,
Quaid-I-Azam University Islamabad, Pakistan.
*Corresponding author. E-mail:
javed_kamal1743@yahoo.com.
Abbreviations:
DW, Distilled water; T0 V1,
control (DW); T1 V1, leaf
extract (1 g + 10 ml DW); T2 V1,
stem extract (1 g + 10 ml DW); T3 V1,
root extract (1 g + 10 ml DW); V1, Margalla 99;
T0 V2, control (DW); T1
V2, Leaf extract (1 g + 10 ml DW); T2
V2, stem extract (1 g + 10 ml DW); T3
V2, root extract (1 g + 10 ml DW); V2,
Chakwall 97.
Accepted 30 October, 2008 |
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Pot-grown seedlings of wheat cultivars Margalla 99 and
Chakwall 97 were given water mixed with extracts of
sunflower leaves, stems, or roots 20 days after the
seedlings had emerged. Data on growth and yield parameters,
weed density, and hormone production were recorded.
Physicochemical properties of soil were analysed before
sowing sunflower and after harvesting wheat. Commonly
observed effects of allelochemicals were (a) decreased
production of indole-3-acetic acid and gibberellic acid and
lower values of electrical conductivity, moisture content,
weed density, and fresh and dry weight of weeds, and (b)
increased production of abscisic acid and higher values of
pH, Mn, Fe, Mg, Ca, K, 100-grain-weight, and fresh and dry
weight of wheat plants.
Key words:
Allelochemicals, atomic absorption, growth and yield
parameters, HPLC, hormonal analysis, physico-chemical
analysis of soil, wheat, weeds. |
