INFLUENCE OF DIFFERENT GRAZING SYSTEMS ON PHYSICAL PROPERTIES AND AGGREGATION IN SAVANNAH SOILS INFLUÊNCIA DE DIFERENTES SISTEMAS DE PASTEJO SOBRE AS PROPRIEDADES FÍSICAS E AGREGAÇÃO EM SOLOS DE CERRADO

INFLUENCE OF DIFFERENT GRAZING SYSTEMS ON PHYSICAL PROPERTIES AND AGGREGATION IN SAVANNAH SOILS INFLUÊNCIA DE DIFERENTES SISTEMAS DE PASTEJO SOBRE AS PROPRIEDADES FÍSICAS E AGREGAÇÃO EM SOLOS DE CERRADO

<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...

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Bibliographic Details
Main Authors: Eduardo Rodrigues de Carvalho, Aldi Fernandes de Souza França, Huberto José Kliemann, Luiz Carlos Balbino, Geraldo César de Oliveira, Silvano Alves Pereira
Format: Article
Language:English
Published: Universidade Federal de Goiás 2010-08-01
Series:Pesquisa Agropecuária Tropical
Subjects:
Cynodon dactilum
Panicum maximum
pastejo contínuo
pastejo rotacionado
taxa de lotação
Online Access:http://www.revistas.ufg.br/index.php/pat/article/view/5353
Description
Summary:&lt;p style="margin-bottom: 0cm; font-style: normal; font-weight: normal; line-height: 120%; text-decoration: none;" lang="pt-BR" align="JUSTIFY"&gt;&lt;span style="color: #000000;"&gt;&lt;span style="font-family: Times New Roman,serif;"&gt;&lt;span style="font-size: x-small;"&gt;&lt;span style="font-size: small;"&gt;The objective of this study was to evaluate soil structure alterations that occurred in a typical Red distroferric Latossol under different grazing systems. In 2004, soil samples from three depths (0-2 cm, 2-7 cm, and 30-35 cm) were collected in a farm owned by the College of Veterinary of the Federal University of Goi&amp;aacute;s, Goi&amp;acirc;nia, Goi&amp;aacute;s State, Brazil, as it follows: I) soil under pasture with &lt;/span&gt;&lt;span style="font-size: small;"&gt;&lt;em&gt;Panicum maximum&lt;/em&gt;&lt;/span&gt;&lt;span style="font-size: small;"&gt; cv. Tanzania, in a rotational grazing system, clump position (&amp;ldquo;C&amp;rdquo;); II) soil under pasture with &lt;/span&gt;&lt;span style="font-size: small;"&gt;&lt;em&gt;Panicum maximum&lt;/em&gt;&lt;/span&gt;&lt;span style="font-size: small;"&gt; cv. Tanzania, in a rotational grazing system, among clumps position (&amp;ldquo;AC&amp;rdquo;); III) soil under pasture with &lt;/span&gt;&lt;span style="font-size: small;"&gt;&lt;em&gt;Cynodon dactilum&lt;/em&gt;&lt;/span&gt;&lt;span style="font-size: small;"&gt; cv. Tifton 85, in a continuous grazing system; and IV) soil under Savannah, as reference. The implantation of pastures with Tifton 85 and Tanzania grasses changed physical properties of the soil, through the reduction of macropores (MAC) and increase in soil density (SD). Soils under pastures with Tifton 85 and Tanzania grasses (&amp;ldquo;C&amp;rdquo; position) presented larger mean geometric diameter (MGD), if compared to the soils under Savannah and pasture with Tanzania grass (&amp;ldquo;AC&amp;rdquo; position). Alterations in soil structure were more significant in the topsoil layer (0-2 cm and 2-7 cm depth). Stocking rates practiced in the pastures with Tifton 85 and Tanzania grasses were excessive and also the main reason for &lt;/span&gt;&lt;span style="font-size: small;"&gt;deteriorating&lt;/span&gt;&lt;span style="font-size: small;"&gt; physical soil properties. &lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/p&gt; &lt;p style="margin-bottom: 0cm; font-style: normal; font-weight: normal; line-height: 120%; text-decoration: none;" lang="pt-BR" align="JUSTIFY"&gt;&lt;span style="color: #000000;"&gt;&lt;span style="font-family: Times New Roman,serif;"&gt;&lt;span style="font-size: small;"&gt;&lt;span style="color: #000000;"&gt;&lt;span style="text-decoration: none;"&gt;&lt;span style="font-family: Times New Roman,serif;"&gt;&lt;span lang="en-US"&gt;&lt;span style="font-style: normal;"&gt;&lt;span style="font-weight: normal;"&gt;KEY-WORDS: &lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;span style="color: #000000;"&gt;&lt;span style="text-decoration: none;"&gt;&lt;span style="font-family: Times New Roman,serif;"&gt;&lt;span lang="en-US"&gt;&lt;em&gt;&lt;span style="font-weight: normal;"&gt;Cynodon dactilum&lt;/span&gt;&lt;/em&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;span style="color: #000000;"&gt;&lt;span style="text-decoration: none;"&gt;&lt;span style="font-family: Times New Roman,serif;"&gt;&lt;span lang="en-US"&gt;&lt;span style="font-style: normal;"&gt;&lt;span style="font-weight: normal;"&gt;; &lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;span style="color: #000000;"&gt;&lt;span style="text-decoration: none;"&gt;&lt;span style="font-family: Times New Roman,serif;"&gt;&lt;span lang="en-US"&gt;&lt;em&gt;&lt;span style="font-weight: normal;"&gt;Panicum maximum&lt;/span&gt;&lt;/em&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;span style="color: #000000;"&gt;&lt;span style="text-decoration: none;"&gt;&lt;span style="font-family: Times New Roman,serif;"&gt;&lt;span lang="en-US"&gt;&lt;span style="font-style: normal;"&gt;&lt;span style="font-weight: normal;"&gt;; continuous grazing system; rotational grazing system; stocking rate.&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/p&gt; &lt;span&gt;&lt;span style="font-size: small;"&gt;&lt;/span&gt;&lt;/span&gt;<br>&lt;p style="margin-bottom: 0cm; font-style: normal; font-weight: normal; line-height: 120%; text-decoration: none;" lang="pt-BR" align="JUSTIFY"&gt;&lt;span style="color: #000000;"&gt;&lt;span style="font-family: Times New Roman,serif;"&gt;&lt;span style="font-size: small;"&gt;Objetivou-se avaliar altera&amp;ccedil;&amp;otilde;es da estrutura do solo, que ocorreram em um Latossolo distr&amp;oacute;fico t&amp;iacute;pico, causadas por diferentes sistemas de pastejo. No ano de 2004, amostras de solo (0-2 cm, 2-7 cm e 30-35 cm de profundidade) foram colhidas, em fazenda pertencente &amp;agrave; Escola de Veterin&amp;aacute;ria da Universidade Federal de Goi&amp;aacute;s, com as seguintes especifica&amp;ccedil;&amp;otilde;es: I) solo sob pastagem de &lt;em&gt;Panicum maximum&lt;/em&gt; cv. Tanz&amp;acirc;nia, em sistema rotacionado de pastagem, posi&amp;ccedil;&amp;atilde;o touceira (&amp;ldquo;C&amp;rdquo;); II) solo sob pastagem de &lt;em&gt;Panicum maximum&lt;/em&gt; cv. Tanz&amp;acirc;nia, em sistema rotacionado de pastagem, posi&amp;ccedil;&amp;atilde;o entre touceiras (&amp;ldquo;AC&amp;rdquo;); III) solo sob pastagem de &lt;em&gt;Cynodon dactilum&lt;/em&gt; cv. Tifton 85, em sistema cont&amp;iacute;nuo de pastagem; e IV) solo sob vegeta&amp;ccedil;&amp;atilde;o de Cerrado, como refer&amp;ecirc;ncia. A implanta&amp;ccedil;&amp;atilde;o das pastagens, com as gram&amp;iacute;neas Tifton 85 e capim Tanz&amp;acirc;nia, modificaram as propriedades f&amp;iacute;sicas do solo, por meio da redu&amp;ccedil;&amp;atilde;o de macroporos (MAC) e aumento na densidade do solo (SD). Solos sob pastagem com Tifton 85 e capim Tanz&amp;acirc;nia (posi&amp;ccedil;&amp;atilde;o &amp;ldquo;C&amp;rdquo;) apresentaram maior di&amp;acirc;metro m&amp;eacute;dio geom&amp;eacute;trico (MGD), se comparados aos solos sob Cerrado e capim Tanz&amp;acirc;nia (posi&amp;ccedil;&amp;atilde;o &amp;ldquo;AC&amp;rdquo;). As altera&amp;ccedil;&amp;otilde;es na estrutura do solo foram mais relevantes nas camadas superficiais (0-2 cm e 2-7 cm de profundidade). As taxas de lota&amp;ccedil;&amp;atilde;o, praticadas nas pastagens com as gram&amp;iacute;neas Tifton 85 e capim Tanz&amp;acirc;nia, foram excessivas, sendo a principal causa da deteriora&amp;ccedil;&amp;atilde;o das propriedades f&amp;iacute;sicas do solo.&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/p&gt; &lt;p style="margin-bottom: 0cm; font-style: normal; font-weight: normal; line-height: 120%; text-decoration: none;" lang="pt-BR" align="JUSTIFY"&gt;&lt;span style="color: #000000;"&gt;&lt;span style="font-family: Times New Roman,serif;"&gt;&lt;span style="font-size: small;"&gt;&lt;span style="color: #000000;"&gt;&lt;span style="text-decoration: none;"&gt;&lt;span style="font-family: Times New Roman,serif;"&gt;&lt;span lang="pt-BR"&gt;&lt;span style="font-style: normal;"&gt;&lt;span style="font-weight: normal;"&gt;PALAVRAS-CHAVE: &lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;span style="color: #000000;"&gt;&lt;span style="text-decoration: none;"&gt;&lt;span style="font-family: Times New Roman,serif;"&gt;&lt;span lang="pt-BR"&gt;&lt;em&gt;&lt;span style="font-weight: normal;"&gt;Cynodon dactilum&lt;/span&gt;&lt;/em&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;span style="color: #000000;"&gt;&lt;span style="text-decoration: none;"&gt;&lt;span style="font-family: Times New Roman,serif;"&gt;&lt;span lang="pt-BR"&gt;&lt;span style="font-style: normal;"&gt;&lt;span style="font-weight: normal;"&gt;; &lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;span style="color: #000000;"&gt;&lt;span style="text-decoration: none;"&gt;&lt;span style="font-family: Times New Roman,serif;"&gt;&lt;span lang="pt-BR"&gt;&lt;em&gt;&lt;span style="font-weight: normal;"&gt;Panicum maximum&lt;/span&gt;&lt;/em&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;span style="color: #000000;"&gt;&lt;span style="text-decoration: none;"&gt;&lt;span style="font-family: Times New Roman,serif;"&gt;&lt;span lang="pt-BR"&gt;&lt;span style="font-style: normal;"&gt;&lt;span style="font-weight: normal;"&gt;; pastejo cont&amp;iacute;nuo; pastejo rotacionado; taxa de lota&amp;ccedil;&amp;atilde;o.&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;
ISSN:1983-4063

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