aquatic weeds and their management
practiced to prepare organic soil conditioners. Clogging of Canals by water hyacinth, that move downstream. Water hyacinth Fig 5. However, within almost every one of these plant groups there are species 2,4-D, Glyphosate, Diquat, Paraquat are used to control the emergment and floating weeds. (1990). One of the direct results of these projects is the creation of a chain of man-made lakes, dotting the Indian landscape from Kashmir to Kanyakumari and Bengal to Gujarat. The practice of chaining should be followed when, from trees and other such obstructions. ‘n’ value of a channel from 0.024 to 0.55 i.e. aquatic applications because they are less toxic to fish. This type of control is more effective in static water such as, ponds or tanks where dye remain suspended. However, the increasing pollutant load and the over exploitation of the water resources for potable supplies, irrigation, industries and thermal power plants to meet the requirements of the ever-increasing population, significantly reduces their. (a). Management of Aquatic Plants Booklet Lake and Wetland Management Resources. In that condition managment is necessary. ducks and fish. National Council for Research of Sudan and National Academy of Sciences, USA, 1975 Aquatic weed management: some prospects for the Sudan and the Nile Basin. Submerged freshwater macrophytes are no more productive in the temperate region but may attain 13–21 m.t./ha. Comparisons of plant productivity. Coniferous forests, and perennial plants under intensive cultivation, may produce 25–40 m.t./ha. Aquatic weeds create situation which are ideal for mosquito growth: Aquatic weeds also affect quality of water: Increase the organic matter content of water: Annual weeds are sprayed before flowering to prevent production of seeds. and Kirmse, D.W. (1974). Join ResearchGate to discover and stay up-to-date with the latest research from leading experts in, Access scientific knowledge from anywhere. Aquatic weeds have been found to severely reduce the flow capacity of irrigation canals thereby reducing the availability of water to the farmers field. Walia, U.S. (2003). pond, drain, rivers etc. Trade chemical of 2,4-D & Glyphosate, dosages. Submerged Plants. Lake and Reservoir Management: Vol. Westlake, D.F. Therefore, Glyphosate is classified as a broad spectrum herbicide. Printers and Publishers. SRAC-360, Aquatic Weed Management – Control Methods, contains additional information on the various methods used to control undesirable weeds in fish ponds. b. Primary production is denned as the weight of new organic matter created by photosynthesis over a period; expressed as a rate it becomes productivity. 19b. category. Thus, the dual stress exerted on the watercourses is ultimately faced by the biological communities inhabiting them. (1987). J.G.W. The specific activity of proteolytic and amylolytic enzymes showed significant increase (P < 0.001) in fish fed with the weed. Assuming that the soil structure is good and that ample nutrients are available there appear to be three main ways of increasing yields; irrigating, using plants which maintain an active cover throughout the year, and developing techniques to obtain valuable products from plants, or parts of plants, not directly useable. Granular 2,4-D controls submersed weeds. Dominant aquatic macrophytes were identified as well as their morphological and biological characteristics. Fig. Summary1. To manage aquatic weeds effectively, a holistic, integrated pest management (IPM) approach should be adopted. The major aquatic weeds found in Kerala include Salvinia spp., Eichhornia crassipes, Pistia stratiotes, Alternanthera spp., Azolla, common duckweed, and Hydrilla verticillata. Net production is that part of the gross photosynthetic production which is not respired by the plant, and hence becomes available for utilization.4. Common examples include species in the Chlamydomonas and Chlorellagenera.
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