The Effect of Fertilizing Tea Plantation to Peishih River

Tea plantations are main agricultural industry in Peishih river catchment. The farming methods of tea plantations will cause some soil bared. When rain fall down, some soils will be taken into the river by overland flow. Nitrogen, phosphorus and other nutrients which was contained in soils will lead to water pollution and eutrophication. This study explores fertilizing tea plantations impact on Peishih river. he experimental results shows that after the fertilization, the concentration of total nitrogen in surface runoff water will increase 3.5 time than before the fertilization. In six times pesticides detection, only N-(Phosphonomethyl) Glycine was detected once. The reason is using more than usual amount of Glycine usage. According to the results of the impact assessment, high-pollution potential tea plantations will increase 23% to 207% concentration of total phosphorus and increase 0.4% to 13.4% concentration of total nitrogen in Peishih river. This study estimates the annual amount of phosphorus emissions of tea plantation by a laboratory scale experiment. And the results of annual amount of phosphorus emissions are 29.1 kg/ha-yr and 29.2 kg/ha-yr. That account for 1% and 2% of annual amount of phosphorus fertilization.