Growth of Chromolaeana odorata (Siam weed) in two soil samples studied under greenhouse condition

Chromolaena odorata (Siam weed), an invasive plant is known to be attracted to different types of soil as a result of the abundance of certain soil nutrients. However, there is very little information as to the evaluation of soil conditions that causes invasion of those specific soils by the plants. In this experiment, the components of two soil samples used in the greenhouse for the propagation of Siam weed was assessed, the physical condition of the greenhouse evaluated followed by the determination of the ability of the weed to grow under such conditions. Textural analysis of the two soil samples indicated clay and sandy loam soil. Meanwhile measured growth parameters in clay soil were significantly different from that of the sandy loam soil at 0.05 degree of freedom. Optimal growth of Siam weed was observed with the prevalent conditions and the physico-chemical parameters of the soil were improved upon throughout the duration of growth of the plant. The best stage for cross transplanting of the weed was found to fall within the range of 4 weeks after sprouting in the nursery as was noted by the highest percentage of survival of the plants within that interval of time. This study provides better propagation conditions of Siam weed especially in an environment deficient of the plant. It also provides an insight into the control of Chromolaena odorata.