Pesquisa Agropecuária Tropical (Jan 2009)

SEWAGE SLUDGE IN SOIL FERTILITY, Brachiaria decumbens NUTRITION, AND DEHYDROGENASE ACTIVITY LODO DE ESGOTO NA FERTILIDADE DO SOLO, NA NUTRIÇÃO DE Brachiaria decumbens E NA ATIVIDADE DA DESIDROGENASE

  • Carlos Sérgio Tiritan,
  • Fabio Carmona Gil,
  • Fabio Fernando de Araujo

DOI
https://doi.org/10.5216/pat.v39i1.3319
Journal volume & issue
Vol. 39, no. 1
pp. 1 – 6

Abstract

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<!--[if gte mso 9]><xml> <w:WordDocument> <w:View>Normal</w:View> <w:Zoom>0</w:Zoom> <w:HyphenationZone>21</w:HyphenationZone> <w:PunctuationKerning /> <w:ValidateAgainstSchemas /> <w:SaveIfXMLInvalid>false</w:SaveIfXMLInvalid> <w:IgnoreMixedContent>false</w:IgnoreMixedContent> <w:AlwaysShowPlaceholderText>false</w:AlwaysShowPlaceholderText> <w:Compatibility> <w:BreakWrappedTables /> <w:SnapToGridInCell /> <w:WrapTextWithPunct /> <w:UseAsianBreakRules /> <w:DontGrowAutofit /> </w:Compatibility> <w:BrowserLevel>MicrosoftInternetExplorer4</w:BrowserLevel> </w:WordDocument> </xml><![endif]--><!--[if gte mso 9]><xml> <w:LatentStyles DefLockedState="false" LatentStyleCount="156"> </w:LatentStyles> </xml><![endif]--><!--[if !mso]><object classid="clsid:38481807-CA0E-42D2-BF39-B33AF135CC4D" id=ieooui></object> <style> st1:*{behavior:url(#ieooui) } </style> <![endif]--> <!-- /* Style Definitions */ p.MsoNormal, li.MsoNormal, div.MsoNormal {mso-style-parent:""; margin:0cm; margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:12.0pt; font-family:"Times New Roman"; mso-fareast-font-family:"Times New Roman";} @page Section1 {size:595.3pt 841.9pt; margin:70.85pt 3.0cm 70.85pt 3.0cm; mso-header-margin:35.4pt; mso-footer-margin:35.4pt; mso-paper-source:0;} div.Section1 {page:Section1;} --> <!--[if gte mso 10]> <style> /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Tabela normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin:0cm; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman"; mso-ansi-language:#0400; mso-fareast-language:#0400; mso-bidi-language:#0400;} </style> <![endif]--> <p class="MsoNormal" style="text-align: justify;">In a greenhouse study, the effect of increasing doses of dry sewage sludge (class A), equivalent to 0 mg, 20 mg, 40 mg, and 80 mg of N dm-3 of soil, from the Franca sewage treatment plant (São Paulo State), was compared to the mineral nitrogen fertilization (40 kg urea ha-1). The experiment was conducted in 2005, using pots with 5 kg of an Oxisol, evaluating the soil fertility, nutrition of Brachiaria decumbens, and dehydrogenase activity. The experimental design was a completely randomized block, with four replications. The application of higher doses of sewage sludge increased the level of soil P by approximately 70%. The increased activity of dehydrogenase in soil showed significant correlation with increasing doses of sludge applied to soil. Only the highest dose of applied sludge (80 mg N dm-3 of soil) increased the dry weight shoot production, while all the doses of sludge applied to soil increased the N leaf content on Brachiaria decumbens.</p> <p class="MsoNormal" style="text-align: justify;"><br /> KEY-WORDS: Microbial activity; pasture; biosolid; N mineralization.</p><!--[if gte mso 9]><xml> <w:WordDocument> <w:View>Normal</w:View> <w:Zoom>0</w:Zoom> <w:HyphenationZone>21</w:HyphenationZone> <w:PunctuationKerning /> <w:ValidateAgainstSchemas /> <w:SaveIfXMLInvalid>false</w:SaveIfXMLInvalid> <w:IgnoreMixedContent>false</w:IgnoreMixedContent> <w:AlwaysShowPlaceholderText>false</w:AlwaysShowPlaceholderText> <w:Compatibility> <w:BreakWrappedTables /> <w:SnapToGridInCell /> <w:WrapTextWithPunct /> <w:UseAsianBreakRules /> <w:DontGrowAutofit /> </w:Compatibility> <w:BrowserLevel>MicrosoftInternetExplorer4</w:BrowserLevel> </w:WordDocument> </xml><![endif]--><!--[if gte mso 9]><xml> <w:LatentStyles DefLockedState="false" LatentStyleCount="156"> </w:LatentStyles> </xml><![endif]--><!--[if !mso]><object classid="clsid:38481807-CA0E-42D2-BF39-B33AF135CC4D" id=ieooui></object> <style> st1:*{behavior:url(#ieooui) } </style> <![endif]--> <!-- /* Style Definitions */ p.MsoNormal, li.MsoNormal, div.MsoNormal {mso-style-parent:""; margin:0cm; margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:12.0pt; font-family:"Times New Roman"; mso-fareast-font-family:"Times New Roman";} @page Section1 {size:595.3pt 841.9pt; margin:70.85pt 3.0cm 70.85pt 3.0cm; mso-header-margin:35.4pt; mso-footer-margin:35.4pt; mso-paper-source:0;} div.Section1 {page:Section1;} --> <!--[if gte mso 10]> <style> /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Tabela normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin:0cm; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman"; mso-ansi-language:#0400; mso-fareast-language:#0400; mso-bidi-language:#0400;} </style> <![endif]--> <p class="MsoNormal" style="text-align: justify;">Em condições de casa de vegetação, estudou-se o efeito das doses crescentes de lodo de esgoto seco (classe A), equivalentes a 0 mg, 20 mg, 40 mg e 80 mg de N dm-3 de solo, originário da Estação de Tratamento de Esgoto de Franca, SP, comparado aos da adubação mineral nitrogenada (40 kg uréia ha-1), quando aplicado a um Argissolo Vermelho-Amarelo distroférrico, sobre a fertilidade do solo, nutrição de Brachiaria decumbens e atividade da enzima desidrogenase. O experimento foi conduzido em Presidente Prudente, SP, utilizando-se vasos com 5 kg de solo, durante o ano de 2005. O delineamento experimental foi em blocos inteiramente casualizados, com quatro repetições. A aplicação das maiores doses de lodo de esgoto aumentou o teor de fósforo no solo, em cerca de 70%. O aumento da atividade da desidrogenase no solo apresentou correlação significativa com o aumento das doses de lodo aplicadas ao solo. Somente a maior dose de lodo aplicada (80 mg de N dm-3 de solo) proporcionou aumento na produção de massa seca da parte aérea, ao passo que todas as doses de lodo aplicadas no solo proporcionaram aumento no teor foliar de N da Brachiaria decumbens.<br /> <br /> PALAVRAS-CHAVE: Atividade microbiana; pastagens; biosólido; mineralização de N.</p>

Keywords