1. Escola Superior De Agricultura “Luiz De Queiroz”, Universidade De São Paulo/USP, Piracicaba, Soil Science Department, SP, Brazil
2. United States Department of Agriculture-Agricultural Research Service, Soil and Water Management Unit, Sant Paul, MN, USA
3. Universidade De Uberlândia/UFU, Institute of Agricultural Sciences, Uberlândia, Uberlândia, SP, Brazil