Allelopathic effects of different doses of Eucalyptus camaldulensis leaf litters were investigated through an experiment in the green house of Institute of Forestry and Environmental Sciences, Chittagong, Bangladesh. ...Allelopathic effects of different doses of Eucalyptus camaldulensis leaf litters were investigated through an experiment in the green house of Institute of Forestry and Environmental Sciences, Chittagong, Bangladesh. Three popular agricultural crops： Falen （Vigna unguiculata）, Chickpea （Cicer arietinum）, Arhor （Cajanus cajan） and two widely used plantation trees： Sada koroi （Albizia procera） and Ipil ipil （Leucaena leucocephala） were selected as bioassay species. Experiment was set on tray at room temperature 27℃. The effects of different doses of leaf litter extracts were compared to the control. Results suggest that leaf litters of E, camaldulesis induced inhibitory effects, It was also found that the effect depend on concentration of extract and litterfall, type of receiver species. Higher concentration of the materials had the higher effect and vice versa. Though all the bioassay species were suppressed some of them showed better performance. Vigna unguiculata, Cicer arietinum are recommended in agroforestry based on this present Experiment output. In mixed plantation, Leucaena leucochephala is a better choice while compared to Albizia procera.展开更多
Constructed rhizofiltration is a relatively new technology and has potential in agricultural wastewater treatment. It has been reported to reduce heavy metals in wastewater but no substantive work has been reported ab...Constructed rhizofiltration is a relatively new technology and has potential in agricultural wastewater treatment. It has been reported to reduce heavy metals in wastewater but no substantive work has been reported about its ability to remove nitrogen and phosphorus, particularly in agricultural wastewater. If this technology＇s worth in nutrient removal from wastewater can be proved, it can save time as well as reducing wastewater treatment cost. Influent and effluent nitrogen and phosphate concentrations in the constructed rhizofiltration were measured and it was found that there was a significant difference between the two water samples （P = 0.01）. It was also found that more nitrogen and phosphate were retained by planted region （P = 0.01） compared to unplanted （P = 0.02）, demonstrating high removal efficiency in the planted region than in the unplanted region. Eighty six percent （86%） removal efficiency of phosphorus was achieved at some points in the planted region while 71% was achieved for nitrogen. These results indicate that constructed rhizofiltration systems, if properly constructed and planted with macrophytes and maintained, can be used for nitrogen and phosphorus removal in wastewater and thus could be used as an alternative technology for agricultural wastewater treatment.展开更多
The effect of climate change in recent times has disrupted the onset and duration of seasons in Nigeria manifesting in the reduction of both staple and cash crops, and livestock yields. This has transformed the countr...The effect of climate change in recent times has disrupted the onset and duration of seasons in Nigeria manifesting in the reduction of both staple and cash crops, and livestock yields. This has transformed the country to a major importer of those agricultural produce she hitherto exported. As a country where over 70% of the population depends on agriculture for survival, the impacts of climate change are a major threat to both food security and the general econoray. Remedial measures which have been suggested including adoption of agronomic and tested practices, reduced burning and afforestation. An option that could be of great potential in ameliorating this situation but which has not been practiced especially in the production of specialty crops is the use of greenhouse farming. This paper discusses the impact of climate change on Nigerian agriculture. The potentials and logistics are required for effective use of greenhouse farming as an adaptation to climate change in Nigeria. It is suggested that research should be carded out to select appropriate glazing materials. The provisions of training and credit facilities for interested farmers are recommended for effective utilization of the system.展开更多
基金Intercooperation,Agroforestry Improvement Project and Village and Farm Forestry Project (IC-VFFP, AFIP) Rajshahi (Funded by Swiss Agency for Development Cooperation,SDC)
文摘Allelopathic effects of different doses of Eucalyptus camaldulensis leaf litters were investigated through an experiment in the green house of Institute of Forestry and Environmental Sciences, Chittagong, Bangladesh. Three popular agricultural crops： Falen （Vigna unguiculata）, Chickpea （Cicer arietinum）, Arhor （Cajanus cajan） and two widely used plantation trees： Sada koroi （Albizia procera） and Ipil ipil （Leucaena leucocephala） were selected as bioassay species. Experiment was set on tray at room temperature 27℃. The effects of different doses of leaf litter extracts were compared to the control. Results suggest that leaf litters of E, camaldulesis induced inhibitory effects, It was also found that the effect depend on concentration of extract and litterfall, type of receiver species. Higher concentration of the materials had the higher effect and vice versa. Though all the bioassay species were suppressed some of them showed better performance. Vigna unguiculata, Cicer arietinum are recommended in agroforestry based on this present Experiment output. In mixed plantation, Leucaena leucochephala is a better choice while compared to Albizia procera.
文摘Constructed rhizofiltration is a relatively new technology and has potential in agricultural wastewater treatment. It has been reported to reduce heavy metals in wastewater but no substantive work has been reported about its ability to remove nitrogen and phosphorus, particularly in agricultural wastewater. If this technology＇s worth in nutrient removal from wastewater can be proved, it can save time as well as reducing wastewater treatment cost. Influent and effluent nitrogen and phosphate concentrations in the constructed rhizofiltration were measured and it was found that there was a significant difference between the two water samples （P = 0.01）. It was also found that more nitrogen and phosphate were retained by planted region （P = 0.01） compared to unplanted （P = 0.02）, demonstrating high removal efficiency in the planted region than in the unplanted region. Eighty six percent （86%） removal efficiency of phosphorus was achieved at some points in the planted region while 71% was achieved for nitrogen. These results indicate that constructed rhizofiltration systems, if properly constructed and planted with macrophytes and maintained, can be used for nitrogen and phosphorus removal in wastewater and thus could be used as an alternative technology for agricultural wastewater treatment.
文摘The effect of climate change in recent times has disrupted the onset and duration of seasons in Nigeria manifesting in the reduction of both staple and cash crops, and livestock yields. This has transformed the country to a major importer of those agricultural produce she hitherto exported. As a country where over 70% of the population depends on agriculture for survival, the impacts of climate change are a major threat to both food security and the general econoray. Remedial measures which have been suggested including adoption of agronomic and tested practices, reduced burning and afforestation. An option that could be of great potential in ameliorating this situation but which has not been practiced especially in the production of specialty crops is the use of greenhouse farming. This paper discusses the impact of climate change on Nigerian agriculture. The potentials and logistics are required for effective use of greenhouse farming as an adaptation to climate change in Nigeria. It is suggested that research should be carded out to select appropriate glazing materials. The provisions of training and credit facilities for interested farmers are recommended for effective utilization of the system.
