That worked for Chen Xianrui, an orange farmer in the nearby village of HuangHua Chang, who says most of his crop was juiceless when his trees were planted on a slope where rainwater ran off quickly.
The order of the pollution for serious level to light level in the seven key river systems in 2001 is: Hai river, Liao river, Huai river, Huang river, Song Hua river, Yangtze river and Pearl river.