USE OF GLYPHOSATE AS GROWTH REGULATOR IN UPLAND RICE GLYPHOSATE COMO REGULADOR DE CRESCIMENTO EM ARROZ DE TERRAS ALTAS

• Main Authors: Daiene Camila Dias Chaves Corsini, José Roberto Portugal, Igor Balbi Guirão Peron, Orivaldo Arf, Douglas de Castilho Gitti, Ricardo Antônio Ferreira Rodrigues
• Format: Article
• Language: English
• Published: Universidade Federal de Goiás 2011-10-01
• Series: Pesquisa Agropecuária Tropical
• Subjects: Oryza sativa L.; acamamento; hormese.
• Online Access: http://www.revistas.ufg.br/index.php/pat/article/view/10160

&lt;p style="margin-bottom: 0cm; font-style: normal; font-weight: normal; line-height: 120%; text-decoration: none;" lang="pt-BR"&gt;&lt;span style="color: #000000;"&gt;&lt;span style="font-family: Times New Roman,serif;"&gt;&lt;span style="font-size: small;"&gt;The lodging of some rice cultivars at harvest time can lead to significant losses in yield, and the inappropriate water and nitrogen management, under high-tech conditions, can aggravate the problem. The use of vegetal regulators is an alternative to reduce lodging, however, information on this topic are rare. The study aimed to evaluate the application of glyphosate sub doses (26 g ha&lt;sup&gt;-1&lt;/sup&gt;, 52 g ha&lt;sup&gt;-1&lt;/sup&gt;, 78 g ha&lt;sup&gt;-1&lt;/sup&gt;, 104 g ha&lt;sup&gt;-1&lt;/sup&gt;, 130 g ha&lt;sup&gt;-1&lt;/sup&gt;, 156 g ha&lt;sup&gt;-1&lt;/sup&gt;, and 182 g ha&lt;sup&gt;-1&lt;/sup&gt;) on agronomical traits, development, and yield of upland rice crops irrigated by aspersion, during the floral differentiation period. The experiment was carried out in Selvíria, Mato Grosso do Sul State, Brazil, through the agricultural years of 2008/2009 and 2009/2010. The increase of glyphosate sub doses, at the floral differentiation period of the Primavera cultivar, reduced the plants height, panicle size, and, consequently, yield. Sub doses higher than or equal to 78 g ha&lt;sup&gt;-1&lt;/sup&gt; eliminated the plants lodging process.&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;<br>&lt;p style="margin-bottom: 0cm; font-style: normal; font-weight: normal; line-height: 120%; text-decoration: none;" lang="pt-BR"&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;O acamamento de algumas cultivares de arroz, no momento da colheita, acarreta perdas significativas na produtividade e, além disto, manejos de água e nitrogênio inadequados, em condições de alta tecnologia, agravam, ainda mais, o problema. O uso de reguladores vegetais é uma das alternativas para se reduzir o acamamento, entretanto, as informações sobre o assunto são escassas. O trabalho objetivou avaliar o uso de subdoses de glyphosate (26 g ha&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;sup&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;-1&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/sup&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;, 52 g ha&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;sup&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;-1&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/sup&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;, 78 g ha&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;sup&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;-1&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/sup&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;, 104 g ha&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;sup&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;-1&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/sup&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;, 130 g ha&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;sup&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;-1&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/sup&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;, 156 g ha&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;sup&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;-1&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/sup&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; e 182 g ha&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;sup&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;-1&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/sup&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;) sobre as características agronômicas, desenvolvimento e produtividade do arroz de terras altas irrigado por aspersão, aplicadas na época da diferenciação floral. O experimento foi desenvolvido no município de Selvíria (MS), durante os anos agrícolas 2008/2009 e 2009/2010. O aumento das subdoses de glyphosate, aplicadas na época da diferenciação floral da cultivar Primavera, reduziu a altura de plantas, o tamanho das panículas e, consequentemente, a produtividade. Subdoses iguais ou superiores a 78 g ha&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;sup&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;-1&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/sup&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; eliminaram o acamamento de plantas.&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;