                                                                                           Renata Moreira Leal 1* , Claudenir Facincani Franco 2 , Luiz Fernando Braghirolli 2 , Adriana Guirado Artur 2 , Debora Zumkeller Sabonaro 2 , Marcos Bettini 2 e Renato de Melo Prado 3 1 Programa de Pós-graduação em Agronomia (Área de Produção Vegetal), Departamento de Ciências Exatas, Universidade Estadual Paulista, Faculdade de Ciências Agrárias e Veterinárias, Via de Acesso Prof. Paulo Donato Castellane s/n, 14884- 900, Jaboticabal, São Paulo, Brasil. 2 Universidade Estadual Paulista, Faculdade de Ciências Agrárias e Veterinárias, Jaboticabal, São Paulo, Brasil. 3 Departamento de Solos e Adubos, Universidade Estadual Paulista, Faculdade de Ciências Agrárias e Veterinárias, Jaboticabal, São Paulo, Brasil. *Autor para correspondência. E-mail: renatamleal@yahoo.com.br      !     !  "  #"# $ %&  ’ #  (%&   (%&  "## #  #  "  )" ! (’ " #  %& (’  " )" " #(’ " #*(" !  ) + " ,# %-# # "# !" #(.#  .#  " /01   23 4   ##  ’ / + +      3   5  #"#4 #  !"  #(!  ’ 6   ! # "# #  .    ", # 7(#  8# 9 #  #"( (#  (%&  "## #     ’   :  # .’#  (" # ## "( %&    ’   :  # .’# # 7(#  " "#" & )# (" #!  (%&  "## # # .#  ’ (’# & " #"#  ) # 7(#    ; 3 "  #"              ! "  "  <  ! # #(= >#  (  !! ! # "  ’  # #  (  ( ! = "  "’ # < )" ># ( ( (# # > "= "’ #     ) + !   # < "# #  > "’ (#  01    23   ! # ! ’ / + +     ! 3   5 ! ##4 # ’ #(! < !!   (> # ># !> ! 9 =# ! #>   = " (   ’    #  # > ( < ># ("(    ! ’   #  # >  # !  # ?>  #! #   = " ( >#  # < #   # )= #=""# >  # (# #! $   ; 3 # "      %&  # (#  ((  " : ##   (( ""  !"  "(# #"   ’ : (" # !# *( (  ("  ( ## ". #(  /94 @ ### "(#  "7  ’  # ((# " ## ## : #(.  (#  , !*A  #( !, " *(# ## & #  # ## /(   4 # ## # "  #" ) %&  " #  "  " # #  ( " (# #  ((# #"   #%& ( : "#"  ’%&  #  (# *(# "  #(" /;# 94 ##" # %-#   ## "( ## (  ## *( " " )## $ !,  3 /0##  0 4 ,"  (%-# ##.#  "  ("# ((# "   ’  "   # !,  ’ :  " " ( "(   (%& #