Copyright
©The Author(s) 2003.
World J Gastroenterol. Jun 15, 2003; 9(6): 1187-1190
Published online Jun 15, 2003. doi: 10.3748/wjg.v9.i6.1187
Published online Jun 15, 2003. doi: 10.3748/wjg.v9.i6.1187
Figure 1 Time trend of nitrate nitrogen in relation to the farming use of nitrogen fertilizer in Cixian County and Chichen County.
Figure 2 Time trend of nitrite nitrogen in relation to the farming use of nitrogen fertilizer in Cixian County and Chichen County.
Figure 3 Time trend of ammonia nitrogen in relation to the farming use of nitrogen fertilizer in Cixian County and Chichen County.
- Citation: Zhang XL, Zhang B, Zhang X, Chen ZF, Zhang JZ, Liang SY, Men FS, Zheng SL, Li XP, Bai XL. Research and control of well water pollution in high esophageal cancer areas. World J Gastroenterol 2003; 9(6): 1187-1190
- URL: https://www.wjgnet.com/1007-9327/full/v9/i6/1187.htm
- DOI: https://dx.doi.org/10.3748/wjg.v9.i6.1187