Author：Hsin-Yuh Wu ¹, Tzung-Han Lee², Kao-Tzung Liao³

¹ Associate researcher, Taoyuan District Agricultural Research and Extension Station, COA
² Assistant researcher, Taoyuan District Agricultural Research and Extension Station, COA
³ Officer, The Central Region Branch of Agriculture and Food Agency, COA

Abstract：

    The purposes of this study were to monitor and investigate the occurrence of irrigation water, acid rain and fluoride of agricultural pollution sources in the northern part of Taiwan and conduct the experiment of simulated acid rain to select plant indicator. Experiments were conducted to determine the EC and heavy metal effects of six rivers’ irrigation water on the soil properties from 2007 to 2011 in Taoyuan County and Xinzhu County. The results showed that conductivity value of the Jiadong river surpasses the irrigation water standard frequently, next for Nankan river, Shezih river and Fengshan river. Heavy metal of copper content surpasses the irrigation water standard frequently at Nankan brook from 2007 to 2009.

    The investigation of acid rain in Taoyuan showed that month-average values of rain were lower than pH 5 from December to April and the lowest was pH 3.8 at December in 2010. The monitoring of air pollutant-fluoride in Zhudong township, Xinzhu County showed that fluoride value of Gladiolus were higher than critical concentration in 2007 and 2011.In the test of simulated acid rain, the height effect on crops with treatment by various pH value of sulphuric acid and nitric acid were insignificant against check, but leaf mustard treatmented with pH 2.6 and 3.6 of sulphuric acid showed decoloration of leaves.

Keywords: Agricultural pollution sources, Irrigation water, Heavy metal, Acid rain, Fluoride.