999 resultados para Block Design


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Pós-graduação em Zootecnia - FCAV

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Pós-graduação em Ciência e Tecnologia Animal - FEIS

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Pós-graduação em Zootecnia - FCAV

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Seleção recorrente é um dos métodos mais eficientes para o melhoramento de espécies alógamas, especialmente quando progênies S1 são utilizadas. Considerando-se que abobrinha geralmente não apresenta perda de vigor pela endogamia, este método pode ser adequado para o melhoramento desta espécie. Neste trabalho foram realizados experimentos com o objetivo de avaliar a eficiência da seleção recorrente em abobrinha 'Piramoita'. Foram realizados três ciclos de seleção recorrente a partir da cultivar Piramoita (população P0), com avaliação e seleção de progênies S1. Novas populações foram obtidas com a recombinação de plantas das progênies selecionadas, utilizando-se sementes remanescentes. No primeiro ciclo foram avaliadas 74 progênies e selecionadas 14, no segundo foram avaliadas 60 e selecionadas 10 progênies e no terceiro ciclo foram avaliadas 77 e selecionadas 12 progênies. Foram obtidas populações melhoradas após um (PI), dois (PII) e três (PIII) ciclos de seleção recorrente. Quatro populações (P0, PI, PII e PIII) foram avaliadas em um delineamento em blocos ao acaso, com oito repetições e cinco plantas por parcela. Em todos os experimentos foram avaliadas as seguintes características: número de frutos total e comercial por planta, % de frutos comerciais, produção, em massa, de frutos total e comercial por planta e a massa média de fruto comercial. Foram observados aumentos de produção lineares significativos ao longo dos ciclos de seleção. Para número de frutos total e comercial e produção, em massa, total e comercial foram obtidos aumentos com a população PIII, comparativamente a população inicial, de 32, 63, 24 e 57%, respectivamente. A massa média de fruto comercial não foi afetada pela seleção recorrente. Conclui-se que a seleção recorrente foi eficiente para melhorar a abobrinha 'Piramoita'... (Resumo completo, clicar acesso eletrônico abaixo)

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Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

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The time, dose and applied nutrients in corn have a direct effect on its productivity. Therefore, the objective was to study the application of N and S in corn as ammonium sulfate, in succession to wheat and oats and evaluate different forms of fertilizer management. The experiment was conducted in a randomized block design in Oxisol (Hapludox). The five treatments with N, at a dose of 120 kg ha(-1) were applied in 20 plots (5x4), according to the management of fertilizer: T1-N (120 kg ha(-1)) full at sowing, T2-N (120 kg ha(-1)) total coverage; T3-N (40 kg ha(-1)) at sowing and N (80 kg ha(-1)) in coverage; T4-N advance in wheat sowing and sowing oats (120 kg ha(-1)), T5-(control). The S doses were corresponding to their concentrations in the fertilizer. Only wheat received a dose of 24 kg N ha(-1) at sowing all plots and oats received 24 kg N ha(-1) at sowing only the portions related to treatment with anticipation of corn N (T4). We evaluated the biomass production of winter crops (oats and wheat), according to the fertilization at sowing, and also the influence of winter crops and management of ammonium sulfate, the corn yield. The oats produced more dry matter in relation to wheat, positively influencing the corn yield, regardless of fertilizer management. The anticipation of ammonium sulfate, the sowing of oats, was favorable to corn yield, equating to other forms of management of fertilizer. Rotation corn and oats, forms management, ammonium sulphate, at seeding, topdressing or applied in split were equally efficient in corn yields.

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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

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The study was conducted to evaluate the efficacy of herbicides in desiccation Raphanus raphanistrum (wild radish) in different application times and their effects on weed seed germination. The experimental had a randomized block design with three replications. The herbicides used were: glyphosate (360; 720; and 1080 g ha(-1)), 2,4-D (335; 670; and 1005 g ha(-1)), glyphosate + 2,4-D (360 + 335; 720 + 670; and 1080 + 1005 g ha(-1)). Spraying was conducted at three different times: 1st season (full bloom) - at 62 days after emergence (DAE), 2nd season (beginning of pod formation) - at 92 DAE and 3rd season (end of pod formation) - at 108 DAE. At 14, 21, 28, 35, and 42 days after application (DAA), the desiccation was evaluated visually, and 42 DAA dry mass of shoots and seeds of the 2nd and 3rd times were collected for the test of germination. All chemical treatments tested were effective in controlling the plants of wild radish in the 1st and 2nd times, but in the 3rd time doses of 2,4-D applied singly were not effective and only the highest dose of glyphosate applied singly or in mixture provided a total plant control. In terms of percentage, the reduction in dry matter of plants was higher with the application of larger doses of chemical treatments. The herbicides affected the germination of seeds of wild radish, and the herbicide 2,4-D provided greater reduction in germination in the 2nd and 3rd seasons.

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Two assays were accomplished being, both using a randomized block design: Assay 1 the aimed was to evaluate the blood parameters of weaned recently pigs and receiving rations with and without probiotic. Twenty pigs with body weight of 6.99 +/- 0.42 kg were used and were collected samples of blood to the 0, 7, 14, 21 and 28 days after wean, for determinations of the bool parameters. Assay 2 the objective was to determine the rations digestibility for growth swine supplemented or not with probiotic in the rations. The rations and the ages of the animals influenced most of the variables of the blood parameters. The probiotic didn't alter the ration digestibility to exception for mineral matter. It is ended that the blood parameters were altered for the use of the probiotic and the age of the animals, both emphasized to challenges happened after wean and the mineral matter was better taken advantage with the use of the probiotic.