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| Garcia,Rodrigo Arroyo; Toledo,Mariana Zampar; Rosolem,Ciro Antonio. |
| Plant growth regulators (PGRs) applied to cotton plants (Gossypium hirsutum L.) can be washed off by rainfall. It is expected that the closer the rainfall to spraying time, the higher the product loss and the higher the amount of product to be reapplied to reach the desired growth rate. The objective of this study was to evaluate the effects of time between rainfall and application of either mepiquat chloride or chlormequat chloride to cotton on plant growth, as well as, estimate the need for PGR reapplication. Cotton was grown in 12-L pots with soil in a greenhouse. PGRs were applied forty days after seedling emergence, when 50% of plants had one pinhead square. Rainfall was simulated 1, 2, 4, 6, or 24 h after spraying. Plant height was measured just... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Gossypium hirsutum L.; Mepiquat chloride; Chlormequat chloride. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000200005 |
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| Ferrari, Samuel; UNESP; Furlani Junior, Enes; UNESP; Ferrari, João Vitor; UNESP; Santos, Marcio Lustosa; UNESP; Santos, Danilo Marcelo Aires dos; UNESP. |
| Atualmente, o cultivo do algodoeiro está alicerçado em um modelo de produção em escala, caracterizado por altas produtividades e intenso uso de insumos e mecanização. Objetivou-se, com este trabalho, avaliar a influência de diferentes espaçamentos de cultivo, submetidos ou não à aplicação de regulador de crescimento, no desenvolvimento e na produtividade do algodoeiro. O delineamento experimental foi de blocos casualizados, em esquema fatorial 3x3, com nove tratamentos e quatro repetições, constituído por três espaçamentos: 0,45, 0,70 e 0,90 m entre linhas; regulador de crescimento: a) aplicação parcelada em quatro etapas; b) aplicação única aos 70 d.a.e.; e c) sem a aplicação do regulador. O projeto foi instalado no município de Selvíria (MS), em novembro... |
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Palavras-chave: 5.01.00.00-9 Agronomia densidade de plantas; Cloreto de Mepiquat; Características agronômicas e produção 5.01.03.00-8 Fitotecnia plant density; Mepiquat chloride; Agronomic characteristics; Yield. |
| Ano: 2008 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/3546 |
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| Echer,Fábio Rafael; Rosolem,Ciro Antonio. |
| Most of Brazilian cotton is produced in regions where annual rainfall exceeds 1,500mm, hence plant growth regulators (PGR) may be washed from the leaves before being absorbed. The objective of this research was to evaluate mepiquat chloride and chlormequat chloride washing from cotton leaves by rains occurring at different moments post spraying. The experiment was conducted in a greenhouse. Both PGR were sprayed to cotton at pin-head square at 15g ha-1 a.i. with and without a silicon-based adjuvant, and simulated rains were applied at 0, 0.75, 1.5, 3.0, 6.0, 12.0 and 24 hours after spraying, plus a control without rainfall. Addition of silicon adjuvant increased PGR uptake. Rainfall occurring up to 24 hours after spraying resulted in some PGR loss from... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Gossypium hirsutum; Plant height; Mepiquat chloride; Chlormequat Chloride; Rainfall. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782012001200006 |
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