Pesquisa Agropecuária Tropical (Oct 2010)
COMPOSIÇÃO MINERAL DE GRÃOS DE TRIGO SUBMETIDOS A DOSES DE SULFATO DE AMÔNIO E TRINEXAPAC-ETIL MINERAL COMPOSITION OF WHEAT GRAINS SUBJECTED TO AMMONIUM SULFATE AND TRINEXAPAC-ETHYL RATES
Abstract
<!--[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> <mce:style><! st1:*{behavior:url(#ieooui) } --> <!--[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:612.0pt 792.0pt; margin:70.85pt 3.0cm 70.85pt 3.0cm; mso-header-margin:36.0pt; mso-footer-margin:36.0pt; mso-paper-source:0;} div.Section1 {page:Section1;} --> <!--[if gte mso 10]> <mce: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;} --> <p style="margin-bottom: 0cm; font-style: normal; font-weight: normal; line-height: 120%; text-decoration: none;" lang="pt-BR" align="JUSTIFY"><span style="color: #000000;"><span style="font-family: Times New Roman,serif;"><span style="font-size: small;">A composição mineral de grãos é importante para a definição da qualidade nutricional do alimento e qualidade fisiológica das sementes, devendo ser considerada no estabelecimento dos níveis adequados de adubação. Neste contexto, objetivou-se, com este estudo, avaliar o efeito de doses de sulfato de amônio (SA) e de trinexapac-etil, na composição mineral de grãos de trigo (<em>Triticum aestivum</em> L.) cv. Pioneiro. O experimento foi desenvolvido em Viçosa (MG), no período de junho a outubro de 2006. Os tratamentos foram cinco doses de SA (150 kg ha<sup>-1</sup>, 300 kg ha<sup>-1</sup>, 450 kg ha<sup>-1</sup>, 600 kg ha<sup>-1</sup> e 750 kg ha<sup>-1</sup>), combinadas com quatro doses de trinexapac-etil (0 g ha<sup>-1</sup>; 62,5 g ha<sup>-1</sup>; 125 g ha<sup>-1</sup>; e 187,5 g ha<sup>-1</sup>). O experimento foi instalado em delineamento de blocos casualizados, com quatro repetições. As doses de SA aumentaram as concentrações de N-total (proteína), Ca, S, Cu e Zn e diminuíram as concentrações de P, K e Mn (acima de 457 kg ha<sup>-1</sup>de SA). Os teores de Mg e Fe não foram influenciados pelas doses de SA. O trinexapac-etil promoveu aumento de N-total, P e Mn e redução de Ca. Os teores de K, S, Cu, Zn, Mg e Fe não foram influenciados pelo redutor. Concluiu-se que a aplicação de SA melhora a qualidade nutricional de grãos, enquanto a utilização do redutor de crescimento trinexapac-etil não influencia na composição mineral dos mesmos.</span></span></span></p> <p style="margin-bottom: 0cm; font-style: normal; font-weight: normal; line-height: 120%; text-decoration: none;" lang="pt-BR" align="JUSTIFY"><span style="color: #000000;"><span style="font-family: Times New Roman,serif;"><span style="font-size: small;">PALAVRAS-CHAVE:<strong> </strong><em>Triticum aestivum</em> L.; nutrição; redutor de crescimento.</span></span></span></p><p style="margin-bottom: 0cm; font-style: normal; font-weight: normal; line-height: 120%; text-decoration: none;" lang="pt-BR" align="JUSTIFY"><span style="color: #000000;"><span style="font-family: Times New Roman,serif;"><span style="font-size: small;">Grain mineral composition is important for the establishment of appropriate fertilizer levels, as well as to define the nutritional quality of food and physiological quality of seeds. The objective of this study was to evaluate the effect of ammonium sulfate (AS) and trinexapac-ethyl rates on mineral composition of wheat grains (<em>Triticum aestivum</em> L.) cv. Pioneiro. The experiment was carried out in Viçosa, Minas Gerais State, Brazil, from June to October 2006. The treatments consisted of five AS rates (150 kg ha<sup>-1</sup>, 300 kg ha<sup>-1</sup>, 450 kg ha<sup>-1</sup>, 600 kg ha<sup>-1</sup>, and 750 kg ha<sup>-1</sup>) combined with four trinexapac-ethyl rates (0 g ha<sup>-1</sup>, 62.5 g ha<sup>-1</sup>, 125 g ha<sup>-1</sup>, and 187.5 g ha<sup>-1</sup>). The experiment was arranged in a randomized block design with four replications. AS rates increased the concentrations of total-N (protein), Ca, S, Cu, and Zn and decreased the concentrations of P, K, and Mn (at AS rates above 457 kg ha<sup>-1</sup>). The Mg and Fe concentrations were not influenced by AS rates. Trinexapac-ethyl increased total-N, P, and Mn; reduced Ca; and had no influence on the concentrations of K, S, Cu, Zn, Mg, and Fe. It can be concluded that AS application improves the nutritional quality of grains, while the use of the growth retardant trinexapac-ethyl has no influence on its mineral composition.</span></span></span></p> <p style="margin-bottom: 0cm; font-style: normal; font-weight: normal; line-height: 120%; text-decoration: none;" lang="pt-BR" align="JUSTIFY"><span style="color: #000000;"><span style="font-family: Times New Roman,serif;"><span style="font-size: small;">KEY-WORDS: <em>Triticum aestivum</em> L.; nutrition; growth retardant.</span></span></span></p>
Keywords
