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.
|Published (Last):||6 July 2007|
|PDF File Size:||12.75 Mb|
|ePub File Size:||11.48 Mb|
|Price:||Free* [*Free Regsitration Required]|
The studies reviewed have left their mark on safflower improvement in recent years. Agronomy Journal 99, Akobundu listed factors such as soil temperature, soil moisture regime, alternate wetting and drying of soil, soil nitrate level among others as those that affect seed germination.
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 own seeds.
Allelopathic effects of water extracts of Artemisia princeps var. In the Laboratory, maize seed germination was not hindered by siam weed extract. The allelopathic potential of Chromolaena odorata on seed germination and seedling growth of vigina unguiculata var. Effect of fresh shoot aqueous extract FSE of Chromolaena odorata on the fresh weight of root and shoot of Celosia argentea.
Vegetable production is characterized by the heavy use of fertilizer and this may cause future environmental problem in both water and soil ecosystems. The results obtained from the study indicated that the shoot height, leaf area chromollaena, fresh and dry weights of the plants treated with the aqueous were higher than those of the plants in the control regime.
Factors affecting effectiveness of allelochemicals. Allelopathic mechanisms of velvetleaf Abutilon theophrasti Medic.
A Petri dish was lined with sterilized filter paper for each treatment. On cowpea and soybean, 14 and 8 percent reduction in seed germination, respectively was recorded when compared with the untreated control.
Soil chemical properties, including nutrient contents, soil pH, water, and electrical conductivity, when used as covariates or predictors in calibration and validation partial least squares regression models, provided new insights into the variation structure and prediction of crop performance. Laboratory and greenhouse experiments were conducted at I.
Allelopathy in the search for natural herbicide model. Nutrient ratios of carbon, nitrogen, phosphorus, and sulfur in seed were slightly better predictors of oil content and oil yield chrromolaena those in soil. Allelopathy and Sustainable Agriculture.
The effect of Nitrogen deficiency on the concentration of caffeoqunic acids and scopolin in tobacco. For this purpose, a two-year field experiment with different sowing dates was conducted to determine minimum, dffect and maximum temperature for seedling emergence cardinal temperatures required for seedling emergence. This observation might be due to low concentration of allelochemical present in the aqueous extract.
Tax E and two weeds — Siam weed and tridax Tridax procumbens L. Critical Review in Plant Science 18, Various biological, chemical and physical components may be responsible. Secondary plant metabolites and their degradation products which have been known to be involved in this phenomenon are all important in all agro ecosystems Chung et al.
Potential allelopathic quaianolides from cultiver sunflower leaves var. Principles and Practices in Plant Ecology: Root length, shoot length, leaf area, fresh and dry weight of root and shoot were determined. Celosia argentea is a vegetable crop grown in Nigeria.
Germinated seeds defined as emergence of radicle were counted 4 days after onset of the experiment and this was continued for a period of seven days thereafter.
The drying curves were fitted using three drying models – polynomial, Page and sigmoid. At 4 and 6 WAP for seedlings and 8 and 10 WAP for weed seedling, samples were randomly harvested, dried and weighed to determine dry matter content.
Although, the effect was slight on crop seeds and more on weed seeds, this report is corroborated by the findings of Oke that siam weed extract inhibited the germination of seeds of cowpea, soybean and tridax. Effect of fresh shoot aqueous allellpathic FSE of Chromolaena odorata on the dry weight of root and shoot of Celosia argentea.
Treated Petri dishes were each supplied with 25 ml of extract while the untreated control was treated with 25 ml of distilled water. Identification of allelopathic compound from rice Oryza sativa L.
The result was contrary with the finding of Chengrong et al. The composition was sieved and the extract was kept in a refrigerator at 5 o C for subsequent experiments.
The maximum mean for grain Fe concentration over the locations was obtained for L Spatial variation in physico-chemical properties within and among chromoolaena Mollisols during two contrasting cropping seasons accounted for significant and decreasing amounts of variation in crop performance quantified by seed yield, oil content and oil yield in Cuphea Cuphea viscosissima Jacq.