1. Institute of Rural Development of Paraná (IDR‐Paraná) Rd. Celso Garcia Cid, PR‐445, km 375 Londrina PR 86047‐902 Brazil
2. Portal Ciência do Solo (PCS) Américo Brasiliense St., 232, Room 6 Campinas SP 13.025‐230 Brazil
3. Luiz de Queiroz College of Agriculture (ESALQ), Soil Science Dep. Univ. of São Paulo (USP) Pádua Dias Av., 11 Piracicaba SP 13418‐000 Brazil
4. Agrarian Sciences Center, Agronomy Dep. Londrina State Univ. (UEL) Rd. Celso Garcia Cid, PR‐445, km 380, University Campus Londrina PR 86.055‐900 Brazil
5. Brazilian Agricultural Research Corporation (EMBRAPA) National Soybean Center. Rd. Carlos João Strass Londrina PR 86001‐970 Brazil
6. College of Agricultural Sciences, Dep. of Crop Science São Paulo State Univ. (UNESP) José Barbosa de Barros St., 1780 Botucatu SP 18610‐034 Brazil