Variações nos níveis de elementos minerais após aplicações de 2,4-D em progênies de Eucalyptus grandis
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2014-02-18
Autores
Fragoso, Alexandre Martins [UNESP]
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Universidade Estadual Paulista (Unesp)
Resumo
O Brasil triplicou sua produção florestal de eucalipto desde 1970, alcançando médias de 45m3.ha-1.ano-1. Muitos avanços técnicos contribuíram para esta produtividade, dentre eles a utilização de herbicidas para o controle de plantas daninhas, evitando assim grande parte da matocompetição e melhor desenvolvimento do vegetal quanto à iluminação e assimilação de nutrientes. O produto 2,4-D destaca-se como herbicida seletivo às dicotiledôneas utilizado nas grandes culturas, dentre elas está a cultura do eucalipto. O 2,4-D também pode ser usado como regulador vegetal, auxina (Ax), podendo gerar incrementos nutricionais e auxiliar no desenvolvimento morfológico do vegetal após testes preliminares para obtenção de dosagem ideal. O presente trabalho objetivou avaliar a influência e as interações entre a obtenção de dosagem ideal, à espécie e estágio de desenvolvimento (mudas), no primeiro teste do produto 2,4-D como regulador vegetal, para posteriormente ser aplicado em teste de progênies de Eucalyptus grandis para estimar os parâmetros genéticos quantitativos. Os experimentos foram realizados no viveiro de mudas do Departamento de Ciências Florestais – FCA/UNESP, Botucatu-SP. Utilizando mudas procedentes do Horto Florestal de Itatinga. Os delineamentos utilizados 2 foram em blocos casualizados, com cinco tratamentos e cinco repetições para o primeiro teste, com 25 indivíduos por bloco, totalizando 150 indivíduos. E para o teste de progênies foram usadas 20 progênies em três repetições, totalizando 960 plantas. A avaliação de médias para o primeiro teste foi realizada pelo teste Tukey a 5% de probabilidade, com o programa estatístico ASSISTAT 7.6 beta e para o teste de progênies foram obtidos os parâmetros genéticos quantitativos pelo programa computacional SELEGEN. Como fatores norteadores após 15 dias da aplicação do produto foram avaliados...
The Brazil tripled its eucalyptus production reaching averages 45m3.ha-1.year-1 in comparison to 70's decade. Many technical advances have contributed to this productivity, among it the use of herbicides for weed control, thus avoiding much of the weed competition and better development of the plant as the lighting and nutrient assimilation. The 2,4-D product stands out as selective herbicide for broadleaved used in major crops, among them is the cultivation of eucalyptus. 2,4-D may also be used as plant growth regulator like synthetic auxin (Ax) and may generate nutritional helper increases and the morphological development of the plant after preliminary testing to obtain optimal dosage. This study aimed to evaluate the influence and interactions between obtaining optimal dosing in the first test of 2,4-D product as plant growth regulator, to subsequently be applied in progeny test of Eucalyptus grandis to estimate quantitative genetic parameters. The experiments were performed in the seedling nurseries of the Department of Forest Sciences - FCA / UNESP, Botucatu-SP. Using seedlings coming from Horto de Itatinga. The designs were used in a randomized block design with five treatments and five repetitions for the first test, with 25 trees each, totaling 150 individuals. And for the 20 progenies progeny tests were used in three replications, totaling 960 plants. The rating average for the first test was performed by Tukey test at 5% probability, with the 7.6 beta ASSISTAT statistical program and the progeny test with the obtention the quantitative genetic parameters were obtained by SELEGEN computer program. As guiding factors after 15 days of product application were evaluated macro and micronutrients (N, P, K, Ca, Mg, S, B, Cu, Fe, Mn and Zn) in plant tissues of aerial part and performed evaluations of characters morphological as height and diameter and direct measurements of dry ...
The Brazil tripled its eucalyptus production reaching averages 45m3.ha-1.year-1 in comparison to 70's decade. Many technical advances have contributed to this productivity, among it the use of herbicides for weed control, thus avoiding much of the weed competition and better development of the plant as the lighting and nutrient assimilation. The 2,4-D product stands out as selective herbicide for broadleaved used in major crops, among them is the cultivation of eucalyptus. 2,4-D may also be used as plant growth regulator like synthetic auxin (Ax) and may generate nutritional helper increases and the morphological development of the plant after preliminary testing to obtain optimal dosage. This study aimed to evaluate the influence and interactions between obtaining optimal dosing in the first test of 2,4-D product as plant growth regulator, to subsequently be applied in progeny test of Eucalyptus grandis to estimate quantitative genetic parameters. The experiments were performed in the seedling nurseries of the Department of Forest Sciences - FCA / UNESP, Botucatu-SP. Using seedlings coming from Horto de Itatinga. The designs were used in a randomized block design with five treatments and five repetitions for the first test, with 25 trees each, totaling 150 individuals. And for the 20 progenies progeny tests were used in three replications, totaling 960 plants. The rating average for the first test was performed by Tukey test at 5% probability, with the 7.6 beta ASSISTAT statistical program and the progeny test with the obtention the quantitative genetic parameters were obtained by SELEGEN computer program. As guiding factors after 15 days of product application were evaluated macro and micronutrients (N, P, K, Ca, Mg, S, B, Cu, Fe, Mn and Zn) in plant tissues of aerial part and performed evaluations of characters morphological as height and diameter and direct measurements of dry ...
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Palavras-chave
Eucalyptus grandis – Aspectos geneticos, Eucalipto - Mudas - Nutrição mineral, Auxina, Metabolismo, Hormonios vegetais, Auxin
Como citar
FRAGOSO, Alexandre Martins. Variações nos níveis de elementos minerais após aplicações de 2,4-D em progênies de Eucalyptus grandis. 2014. v, 48 f. Dissertação (mestrado) - Universidade Estadual Paulista Júlio de Mesquita Filho, Faculdade de Ciências Agronômicas de Botucatu, 2014.