Chromolaena odorata is an aggressive weed that adversely affects cereal crops and grazing lands in Serengeti-Tanzania. This study investigated allelopathic. Allelopathic Effects of Chromolaena odorata (L.) King & Robinson on Seed Germination and Seedlings Growth of Paddy and Barnyard Grass. Fulltext – Effect of Chromolaena odorata on the Growth and Biomass Allelopathy is defined as the direct or indirect harmful or beneficial effect of one plant on.

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July | Australian Journal of Crop Science

Four statistical techniques consisted of canonical correlation Odorahaprincipal component analysis PCcluster analysis, and stepwise regression were undertaken for exploring the relationships. Results showed that the leaf extracts of C. Allelochemicals have been reported to have a beneficial or harmful affect on the growth and development of plants Rice, Weed growth in terms of height and number of leaves could not be assessed because the weeds generally had slow growth and were too tiny to be handled up till 6 weeks of growth assessment.

The filtrate obtained served as treatment for the seedling in the aqueous extract regime FSE. Lawal 2B. The pollen fertility changing patterns of the mononuclear-heteroplasmic TGMS lines were studied under natural condition and low temperature treatments Abstract Chromolaena odorata a weed in the family Asteraceae has been shown to enhance the buildup of organic matter in fallow system in tropical soil.

Qasem observed that the dried shoot extract of Amaranthus gracilis increased shoot and root dry weights of wheat seedlings. The maximum mean for grain Fe concentration over the locations was obtained for L The seed response to storage varied with time, packaging material, and temperature.


Allelopathic mechanisms of velvetleaf Abutilon theophrasti Medic. How to cite this article: Crop Protection 20— Laboratory and greenhouse experiments were conducted at I. Gor Directorate of Groundnut Research, P. Critical Review in Plant Science 18, According to Armstrong et al.

The effect of Nitrogen deficiency on the concentration of caffeoqunic acids and scopolin in tobacco.

Akobundu listed factors such as soil temperature, soil moisture regime, ecfect wetting and drying of soil, soil nitrate level among others as those that affect seed germination. Five kg capacity polyethylene bags were filled with air-dried loamy soil. The impact and compression damages anticipated climacteric ethylene peak and, consequently, fruit ripening.

The inhibitory effect of siam weed extract on germination of its seed is in agreement with the findings of Bhowmik and Doll and Johnson and Harold who observed that many weed species exhibit allelopathic autotoxic effects on the germination of their dffect seeds.

Treated Petri dishes alleolpathic each supplied with 25 ml of extract while the untreated control was treated with 25 ml of distilled water. The results obtained from the study indicated that the shoot height, leaf areafresh and dry weights of the plants treated with the aqueous were higher than those of the plants in the control regime.

Research Journal of Environmental Sciences Volume 5 2: The shoots of C. Hall and Henderlong stated that allelochemicals have to accumulate in sufficiently high quantity in the soil to cause allelopathic effects. Weed Science 34 Water was used because most allelochemicals are water soluble Reigosa et al.

This indicates that alkaline water pre-treatment together with the shortening of the drying time allows to obtain a better quality dried product. The positive effect of spacing competition allelopatic explants was observed in all characters examined at ‘1.


Journal of Applied Sciences and Environmental Management

This could not be attributed to the detrimental effect of siam weed extract as the untreated plants were equally affected but to the growth characteristic of the weeds. Tax E and two weeds — Siam weed and tridax Tridax procumbens L. The root system was carefully excavated. Allelopathic activity of annual worm wood Artemisia annua and the role of artemisinin. aplelopathic

Chikani and Harsukh K. The shoot height and root length of seedlings treated with aqueous extract and those of the control were not statistically chromooaena Table 13. The drying curves were fitted using three drying models – polynomial, Page and sigmoid.

According to Maciasthe application of naturally occurring allelopathic substances which are ecologically friendly to agricultural practice is a promising method to control weeds. Allelopathy in the search for natural herbicide model. Data on weeds could not be taken at this period because weed growth was slow. Siam weed Chromolaena odorata L King and Robinsona perennial weed belongs to the family Asteraceae. Two hundred milliliter of the extract was applied to the pots in the aqueous extract regime while mL of water was applied to the control every morning.

Many of the allelochemicals are water soluble substances released into the environment through leaching, root exudation, volatilization and decomposition of plant residues and are affected by several environmental factors Reigosa et al.

Three non-linear models including den-like, segmented, and beta functions were used to describe the relationship between emergence rate and temperature.