Abstract

Water hyacinth (Eichhornia crassipes) is a type ofaquatic plants afloat. Reproduction of hyacinth is very high andfast so it is considered a weed that can damage the aquaticenvironment. Water hyacinth can grow in all types of waters,such as lakes, rivers, swamps, and even waters that have lownutritional content. Hyacinth thrives in the Lake Toba, LakeToba which is one of the tourist destinations of the world. Thepresence of water hyacinth in the Lake Toba region threaten thebeauty of one of the tourist destinations Indonesia pride. Thecontent of nutrients in the Lake Toba which is high because ofthe activity of the agricultural waste thrown directly into LakeToba adds to the growth of water hyacinth. By looking at theState of the Lake Toba which threatens the growth and beautyof Eichhornia crassipes is very high is a problem that must besolved together. The methode of finishing this paper is journaland book reviewed. This paper will discuss about steps that canbe taken to preserve the Lake Toba from agricultural wastepollution.