Resumo -O objetivo deste trabalho foi avaliar os efeitos de reguladores de crescimento vegetal sobre a frutificação efetiva e a qualidade de frutos partenocárpicos de atemoia 'Gefner'. O experimento foi realizado em pomar de atemoia 'Gefner', em Homestead, Flórida, EUA. Utilizou-se um delineamento experimental de blocos ao acaso, com quatro tratamentos, cinco repetições e seis flores por parcela. Os tratamentos foram compostos por: T1, ácido naftaleno acético a 450 mg L -1 e ácido giberélico a 1.000 mg L -1 ; T2, promalina a 100 mg L -1 e ácido giberélico a 1.000 mg L -1 ; T3, ácido giberélico a 1.000 mg L -1 ; e T4, polinização artificial (testemunha). Foram avaliados a frutificação efetiva, o crescimento e a qualidade dos frutos. A aplicação dos ácidos naftaleno acético e giberélico a flores de atemoia 'Gefner' proporcionou elevada frutificação efetiva, semelhante à da polinização artificial. A aplicação do ácido giberélico, associado ou não ao ácido naftaleno ou à promalina, resulta na produção de frutos de atemoia 'Gefner' mais tardios e menores do que os oriundos da polinização artificial, mas com boa proporção de polpa, excelente teor de sólidos solúveis e, principalmente, frutos sem sementes (partenocárpicos).Termos para indexação: Annona cherimola, Annona squamosa, auxina, frutos sem sementes, giberelina, pegamento de fruto. Growth regulators on fruit set and quality of parthenocarpic fruit in atemoya 'Gefner'Abstract -The objective of this work was to evaluate the effects of plant growth regulators on the effective fruit set and quality of atemoya 'Gefner' parthenocarpic fruit. The experiment was carried out in an orchard of atemoya 'Gefner' in Homestead, Florida, USA. A randomized complete block design was carried out with four treatments, five replicates, and six flowers per plot. Treatments were composed of: T1, 450 mg L -1 naphthaleneacetic acid and 1,000 mg L -1 gibberelic acid; T2, 100 mg L -1 promalin and 1,000 mg L -1 gibberelic acid; T3, 1,000 mg L -1 gibberelic acid; and T4, artificial pollination (control). Effective fruit set, and fruit growth and quality were evaluated. The application of naphthaleneacetic and gibberelic acids on flowers of atemoya 'Gefner' provided high fruit set, similar to that of artificial pollination. Gibberelic acid application, associated or not with naphthaleneacetic acid or promalin, results in later and smaller atemoya 'Gefner' fruit than those obtained by artificial pollination, but with good proportion of pulp, excellent soluble solids content and, mainly seedless fruit (parthenocarpic fruit).Index terms: Annona cherimola, Annona squamosa, auxin, seedless fruit, gibberellin, fruit set. IntroduçãoO desenvolvimento de cultivares sem sementes tem atraído a atenção de produtores, que destacam a facilidade para o consumo in natura ou processado e o valor agregado do produto final, como algumas vantagens advindas desta nova característica (Pandolfini, 2009;Lora et al., 2011 Frutos sem sementes podem ser decorrentes de mutações, como em tomateiro e pinheira, ou de pro...
este trabalho avaliar o desempenho agronômico do milho BRS Caatingueiro e do feijão-de-corda consorciados em diferentes densidades populacionais e arranjos de plantas. O delineamento experimental foi o de blocos casualizados, com sete tratamentos e quatro repetições, sendo cada unidade experimental constituída por uma parcela de 4,0 x 4,0 m. Os tratamentos foram: MS -milho solteiro no espaçamento de 1,0 m; FS -feijão-de-corda solteiro no espaçamento de 0,5 m; MF -fileiras simples de milho espaçadas de 1,0 m, com uma fileira intercalar de feijão-de-corda; MFF -fileiras simples de milho espaçadas de 1,0 m, com duas fileiras de feijão-de-corda; MFF -fileiras duplas de milho espaçadas de 0,5 m, com 1,0 m entre as duplas, com uma fileira intercalar de feijão-de-corda; MMFF -fileiras duplas de milho espaçadas de 0,5 m, com 1,0 m entre as duplas, com duas fileiras intercalares de feijão-de-corda; MFC -milho espaçado de 1,0 m com plantio de feijão-de-corda na mesma cova. Os sistemas de consórcio avaliados afetaram a produtividade do milho BRS Caatingueiro e do feijão-de-corda. Os IEAs obtidos mostram que o consórcio entre milho e feijão-de-corda, nos arranjos MFF, MMFF e MFC, é vantajoso do ponto de vista agronômico. Palavras
Reference values of leaf nutrient contents are essential for nutritional assessment of plants. The objective was to establish nutritional reference values for ‘BRS Platina’ banana in improved fertility soil, using the sufficiency range (SR), border Line (BL) and mathematical chance (MCh) methods, in addition to the critical level obtained by the reduced normal distribution (CLz). The study was carried out in Guanambi-BA, considering nutrient contents and yields of an experiment arranged in randomized blocks, 5 x 6 factorial scheme, with five doses of K2O (0, 200, 400, 600 and 800 kg ha-1) supplied with fertilizers for organic management and six sampling times (210; 390; 570; 750; 930 and 1,110 days after planting), totaling 90 plots. Plots with high yield, ≥ 38.40 t ha-1, formed the reference population and plots with yield ≥ 47.43 t ha-1 formed the reference subpopulation. There was convergence between the optimal values obtained by the methods evaluated. Therefore, the reference values adjusted by the SR, BL, MCh and CLz methods can be used with assertiveness to interpret the foliar analysis of the ‘BRS Platina’ banana in improved fertility soils. Furthermore, among these, MCh stands out as it provides narrower optimal ranges.
The objective of this work was to establish, through different diagnostic methods, nutrient reference values for ‘Prata-Anã’ banana in improved fertility soil. The study included a database from an experiment conducted in randomized block design, arranged in a 5 × 6 factorial scheme (five doses of K2O - 0; 200; 400; 600 and 800 kg ha-1, supplied by cattle manure and rock powder × six evaluations of leaf nutrition and yield – 210; 390; 570; 750; 930 and 1,110 days after planting), with three replicates, totaling 90 samples. The reference values were determined by the Sufficiency Range, Critical Level by the Reduced Normal Distribution, Boundary Line and Mathematical Chance methods. Plots with high yield, = 36.42 t ha-1 cycle-1, formed the reference population and plots with yield = 45.79 t ha-1 formed the reference subpopulation. The methods were efficient in determining the nutrient reference values of ‘Prata-Anã’ banana. In general, the values established are higher than those reported in the literature, justified by the greater chemical fertility of the soil. Among the diagnostic methods, the Mathematical Chance presented itself as the most accurate for interpreting the nutrient contents in the leaves of ‘Prata-Anã’ banana under improved soil fertility conditions.
The objective was to evaluate the production yield and influence of the action of ascorbic acid on the color of dehydrated white and purple sweet potatoes produced in a semi-arid region. The experiment was carried out at the Laboratory of Technology of Products of Plant Origin (TPOV) of the State University of Montes Claros, Janáuba, Minas Gerais, Brazil. Sweet potato roots of the cultivars Brazlândia roxa and Brazlândia branco were used. To determine the action of ascorbic acid on the color of dehydrated white and purple sweet potato, a completely randomized design with 4 replications was used. Analysis of variance was performed in a 2 × 2 factorial scheme, with two cultivars (Roxa and Branca) and absence and presence of ascorbic acid. The results were submitted to statistical analysis using the Sisvar Software. The average yield of white potato was 23% and purple 18.41%. For the variable of soluble solids, no significant differences were observed between the varieties. The sweet potato cultivar Brazlândia Branca showed better yield when submitted to the drying process. The sweet potato cultivar Brazlândia, when submitted to the dehydration process, presented a more yellowish color, however, with less intense coloration in the presence of ascorbic acid.
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