Efeito de elementos tóxicos em função do lodo de esgoto na cultura do girassol
Authors: Lobo Thomaz Figueiredo , Grassi Filho Helio 
Published: June 2015

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A maior preocupação para a utilização do lodo de esgoto na agricultura é o aumento da concentração de elementos tóxicos no solo. O objetivo deste trabalho foi avaliar o comportamento de metais pesados no solo, na planta e no grão do girassol em diferentes dosagens e manejo de lodo de esgoto. O experimento foi conduzido na Fazenda São Manuel pertencente a Faculdade de Ciências Agronômicas da UNESP Campus de Botucatu. Adotou-se o delineamento experimental em blocos casualizados constituído por cinco tratamentos e cinco repetições. Os tratamentos foram: T1 – 50 kg ha-¹ de N da adubação mineral; T2 – 25 kg ha-¹ de N do lodo de esgoto e 25 kg ha-¹ de adubação mineral; T3 – 50 kg ha-¹ de N do lodo de esgoto; T4 – 75 kg ha-¹ de N do lodo de esgoto; T5 - 100 kg ha-¹ de N do lodo de esgoto. Não houve variação dos elementos tóxicos nos teores foliares, nas sementes e na exportação de nutrientes nas sementes. O lodo de esgoto não promoveu incremento nos teores de elementos tóxicos no solo até 40 cm de profundidade.</p><!--[if gte mso 9]><xml> <w:LatentStyles DefLockedState="false" DefUnhideWhenUsed="true" DefSemiHidden="true" DefQFormat="false" DefPriority="99" LatentStyleCount="267"> <w:LsdException Locked="false" Priority="0" SemiHidden="false" UnhideWhenUsed="false" QFormat="true" Name="Normal" /> <w:LsdException Locked="false" Priority="9" SemiHidden="false" UnhideWhenUsed="false" QFormat="true" Name="heading 1" /> <w:LsdException Locked="false" Priority="9" QFormat="true" Name="heading 2" /> <w:LsdException Locked="false" Priority="9" QFormat="true" Name="heading 3" /> <w:LsdException Locked="false" Priority="9" QFormat="true" Name="heading 4" /> <w:LsdException Locked="false" Priority="9" QFormat="true" Name="heading 5" /> <w:LsdException Locked="false" Priority="9" QFormat="true" Name="heading 6" /> <w:LsdException Locked="false" Priority="9" QFormat="true" Name="heading 7" /> 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