[1] Sao Paulo State Univ UNESP, Coll Agr Sci, Dept Crop Sci, Lageado Expt Farm, POB 237, BR-18610034 Botucatu, SP, Brazil
[2] Sugarcane Technol Ctr CTC, POB 162, BR-13400970 Piracipaba, SP, Brazil
[3] Agron Inst Campinas IAC, Soils & Environm Resources Ctr, Ave Barao de Itapura 1481, BR-13020902 Campinas, SP, Brazil