Características agronômicas e o estado nutricional de cultivares de girassol irrigado

Aquino, Leonardo Ângelo de; Silva, Fred Denílson Barbosa da; Berger, Paulo Geraldo

doi:10.1590/s1415-43662013000500013

Cited by 17 publications

(14 citation statements)

References 16 publications

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“…The results of TLA confirm those found by Aquino, Silva and Berger (2013) The results of the sunflower leaf area index (LAI) also presented a quadratic response to the cassava wastewater rates over time ( Figure 1B) ) at 90 DAS. According to Benincasa (2003), the leaf area index is the relation between leaf area and soil area shaded by leaves.…”

Section: Resultssupporting

confidence: 86%

Growth and Seed Yield of Sunflower on Soil Fertilized With Cassava Wastewater

et al. 2017

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-Cassava wastewater is the liquid residue of the cassava flour processing and its application to the soil as fertilizer for agricultural crops is a good alternative to sources of nutrients for plants. In this context, the objective of this work was to evaluate the growth and seed yield of sunflower on soil fertilized with cassava wastewater. A randomized block experimental design with four replications was used, with six cassava wastewater rates (0, 8.5, 17, 34, 68 and 136 m 3 ha -1 ) and six plant sampling times (15, 30, 45, 60, 75 and 90 days after sowing), using the sunflower cultivar Helio-250. The evaluated variables were total leaf area, leaf area index, leaf area ratio, specific leaf area, leaf weight ratio, shoot dry mass and sunflower seed yield. The use of cassava wastewater rate of 136 m 3 ha -1 increases the seed yield, leaf area, leaf area index and shoot dry mass, and results in lower leaf area ratio, specific leaf area and leaf weight ratio of sunflower (cv. Helio-250) crops. ) em quatro repetições, sendo avaliados em seis épocas de amostragens das plantas (15, 30, 45, 60, 75 e 90 dias após a semeadura -DAS), utilizando-se a cultivar de girassol, Helio 250. As variáveis avaliadas foram a área foliar, o índice de área foliar, a razão de área foliar, a área foliar específica, a razão de peso foliar, a massa seca da parte aérea das plantas e a produtividade. A dose de manipueira igual a 136 m 3 ha -1 propiciou maiores produtividade, área foliar, índice de área foliar e massa seca da parte aérea. Os menores valores de razão de área foliar, área foliar específica e a razão de peso foliar foram obtidos quando se utilizou a dose de 136 m 3 ha -1 . Palavras-chave:Helianthus annuus. Manihot esculenta. Resíduo líquido. Índices fisiológicos.

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Section: Resultssupporting

confidence: 86%

Growth and Seed Yield of Sunflower on Soil Fertilized With Cassava Wastewater

et al. 2017

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“…However, there is no sufficient information regarding the nutritional requirements of the species so far, which can compromise the success of projects of reforestation and recomposition of native areas (Sorreano et al, 2012;Aquino et al, 2013). Thus, considering that fertilization practices are fundamental for the production process of high quality seedlings, and to enable forest plantations to reach adequate growth stages on field (Gonçalves et al, 2012;Mishra et al, 2015), a study on fertilizing of potentially producing species is found necessary.…”

Section: Introductionmentioning

confidence: 99%

Effect of deprivation of selected single nutrients on biometric parameters of cedar seedlings (Acrocarpus fraxinifolius) grown in nutritive solution

Munguambe¹,

Venturin²,

Silva³

et al. 2017

Afr. J. Agric. Res.

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The purpose of this work was to assess biometric parameters of cedar seedlings (Acrocarpus fraxinifolius) associated with visual symptomatology of macronutrients deficiency, growth rate, and content and accumulation of nutrients in aerial parts of seedlings grown in nutritive solution. The trial was established in completely randomized design with seven treatments, four replications, and one plant per pot. Treatments consisted of complete nutrient solution, Hoagland and Arnon, and deprivation of the following selected single nutrients: N, P, K, Ca, Mg and S. Micronutrients were provided to all treatments. The following biometric parameters were assessed 90 days after the transplant: shoot height, root collar diameter, root and shoot dry weight. The Dickson index and the ratio given by roots dry weight and shoot dry weight were obtained, as well as the content and accumulation of nutrients in aerial parts of seedlings. The Sisvar statistical analysis system was run for analysis of variance, and averages were compared by means of Scott-Knott test at 5% significance. Treatments consisting of omissions of macronutrients were found to be limiting factors of plants growth and obtaining of seedlings shoot dry weight in the following order: N > P > K > Ca > Mg > S. Deficiencies of these macronutrients caused visible morphological abnormalities, where common symptoms of deficiency of N, P, K and Ca appeared before symptoms of deficiency of Mg and S. The content of nutrients found in aerial parts of seedlings of A. fraxinifolius grown in nutritive solution was greater for treatments consisting of deprivation of N, P and K. The content of nutrients found for treatments consisting of deprivation of Mg and S was not significantly different from that found for the complete nutrients solution.

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“…Segundo ANDRADE et al (2002), a utilização de altas populações em espaçamentos reduzidos tem como objetivo melhorar a interceptação da radiação solar e garantir o controle de plantas daninhas, desde que não haja déficit hídrico nem nutricional. AQUINO et al (2013), estudando os mesmos híbridos com espaçamento superior e população inferior, obtiveram menores valores para esta característica.…”

Section: Resultsunclassified

“…SILVA et al (2007), ao avaliar o crescimento e a produtividade do girassol com diferentes lâminas de água obtiveram, com mesma precipitação, resultados inferiores para os híbridos H250 e H251. AQUINO et al (2013) obtiveram resultado semelhante para altura de planta, estudando os mesmos híbridos avaliados.…”

Section: Resultsunclassified

Efeito do nitrogênio em cobertura na produtividade de girassol, no Estado do Tocantins

Oliveira¹,

Oliveira²,

Barbosa³

et al. 2014

Científica

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ResumoObjetivou-se avaliar respostas de híbridos de girassol sob doses de nitrogênio, em época de segunda safra, em 2013, na região sul do Estado do Tocantins. O experimento foi conduzido na área experimental da Universidade Federal do Tocantins, Câmpus de Gurupi -TO. O delineamento estatístico adotado foi o de blocos ao acaso, no esquema fatorial 3 x 5, com cinco repetições. O primeiro fator correspondeu aos híbridos (Helio 250, Helio 251 e Helio 360), o segundo, às cinco doses de nitrogê-nio em cobertura (0; 50; 100; 150 e 200 kg ha -1 ). As características agronômicas avaliadas foram: número de folhas, altura da planta, altura da inserção do capítulo, diâmetro da haste, diâmetro do capítulo, porcentagem de aquênios normais, massa de mil aquênios, densidade de grãos, número de aquênios por capítulo e produtividade. O híbrido H 251 mostrou-se, em média, superior aos demais, quanto ao diâmetro de capítulo, aquênios normais, número de aquênios por capítulo e produtividade. As variáveis altura da planta, altura do capítulo e diâmetro da haste aumentaram linearmente em função das doses de nitrogênio para todos os híbridos. Diâmetro do capítulo e aquênios normais obtiveram equações lineares e quadráticas. A adubação nitrogenada influenciou sobre as características altura de planta, altura de capítulo, diâmetro da haste, diâmetro do capítulo e número de aquênios por capítulo. O H251 obteve características agronômicas favoráveis para a produção no Estado do Tocantins, obtendo destaque em produtividade. Palavras-chave adicionais: adubação nitrogenada; aquênio; Helianthus annuus L. AbstractThe objective of this study was to evaluate responses of sunflower hybrids to nitrogen doses during the second crop season of 2013, in the southern region of the state of Tocantins, Brazil. The experiment was conducted in the experimental farm of the Federal University of Tocantins, campus Gurupi. The statistical design was a randomized complete block in a 3 X 5 factorial, with five replications. The first factor was the hybrids 'Helio 250', 'Helio 251', and 'Helio 360 and the second the nitrogen doses of 0, 50, 100, 150, and 200 kg ha -1 . The evaluated agronomic traits were the number of leaves, plant height, height of chapter insertion, stem diameter, chapter diameter, percentage of normal achenes, thousand achenes weight, grain density, number of achenes per chapter, and productivity. Hybrid 'Helio 251' mean performance was superior to that of the other hybrids as to chapter diameter, normal achenes, number of achenes per chapter, and productivity. In all hybrids plant height, chapter insertion height, and stem diameter increased linearly with nitrogen doses. Chapter diameter and normal achenes responded linearly and quadratically to nitrogen doses. Nitrogen fertilization influenced plant height, chapter height, stem diameter, and number of achenes per chapter. Hybrid 'H251' responded adequately to the environmental conditions prevailing in Tocantis state specifically in terms of productivity.

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Características agronômicas e o estado nutricional de cultivares de girassol irrigado

Abstract: RESUMO Ca, Mg, and S were 40.91, 3.51, 35.91, 33.91, 6.23, and 7.88

Cited by 17 publications

References 16 publications

Growth and Seed Yield of Sunflower on Soil Fertilized With Cassava Wastewater

Growth and Seed Yield of Sunflower on Soil Fertilized With Cassava Wastewater

Effect of deprivation of selected single nutrients on biometric parameters of cedar seedlings (Acrocarpus fraxinifolius) grown in nutritive solution

Efeito do nitrogênio em cobertura na produtividade de girassol, no Estado do Tocantins

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