4Eric D. Lund, Colin D. Christy. Using electrical conductivity to provide answers for precision fanning [ C ]//In Proc. 1st Int. Conf. on Geospatial Information in Agriculture and Forestry, ERIM Int, 1998.
5Minzan. Li, Maohua. Wang, Qi. Wang. Development and Performance Test of a Portable Soil EC Detector[ J]. Applied Engineering in Agriculture, 2006, 22 (2) : 301 - 307.
5Anastasia Ailamaki,Christos Faloutsos,Paul S Fischbeck.An environmental sensor network to determine drinking water quality and security[J].SCM SIG-MOD Record,2003,32(4):47-52.
6Rasin Z,Abdullah M R.Water quality monitoring system using Zig Bee-based wireless sensor networks[J].International Journal of Engine ering&Technology(IJET),2009,9(10):24-28.
7Yang X,Ong K G,Dreschel W R,et al.Design of a wireless sensor networks for long-term,in-situ monitoring of an aqueous environment[J].Sensors,2002(2):455-472.
