Abstract
In recent years, It has been said that about one-third of the earth's land area is in danger of desertification. Therefore, topsoil, soil nutrients and domestic wastewater are washed away in the hydrosphere. Water pollution, particularly eutrophications has become a serious global problem. Moreover, the problem includes algal proliferation with the release of nutrient salts from the sediment and a decrease in the amount of reservoir water in dams and lakes. The purpose of this paper is to describe the preparation of colloidal-seed pellet for the purification of the hydrosphere. Dredging is an effective method to recover the amount of reservoir water. Sludge and colloidal sediments are considered as waste. However, organic resources are a sourse of nitrogen and phosphorus. The seed pellet was produced from the colloidal sediment of Lake Ezu, and the germination test was carried out with Komatsuna (Brassica campestris) as the material. The germination rate of Komatsuna was 60% or more, and it was effective as a greening material. Therefore, it is suggested that the seed pellet prepared using sediment is one of the useful technologies for the greening of land.
