Análise de crescimento de girassol em Latossolo com diferentes níveis de saturação por bases no Cerrado

Amábile, R. F.; Guimaraes, D. P.; Neto, A. L. de Farias

doi:10.1590/s0100-204x2003000200008

Cited by 9 publications

(7 citation statements)

References 8 publications

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“…The growth patterns of the studied cotton cultivars as described by logistic equations showed symmetric distributions independently of the treatment. This result is in accordance with the finding by Amabile et al (2003), who selected this type of equation as the most adequate model for describing sunflower growth patterns.…”

Section: Discussionsupporting

confidence: 92%

“…Growth patterns were evaluated by the fitting of non-linear functions. Several asyntotic functions are considered adequate to describe this process (Richards, 1959;Nelder, 1961;Amabile et al, 2003). The choice of the model was based on previous plotting analysis.…”

Section: Methodsmentioning

confidence: 99%

“…The choice of the model was based on previous plotting analysis. Data obtained were fitted to a logistic function described by Amabile et al (2003): where ω is the plant height, θ is the plant height at physiological maturity, α is a location parameter, β is the growth expansion rate and X is the time. For computing the inflection time, the relation α/β was used.…”

Section: Methodsmentioning

confidence: 99%

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Tillage effects on the development of several cotton cultivars in Southwest of Bahia, Brazil

Fernandes

Rezende²,

Rezende

et al. 2010

Span. j. agric. res.

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Cotton (Gossypium hirsutum L.r. latifolium Hutch) is very sensitive to soil conditions. The Iuiu Valley, located in the Southwest of Bahia State in Brazil, was an important area for cotton production but an inadequate soil management for years and consequent soil quality degradation lead to the decline of the crop in the region. In an effort to reestablish cotton, this study was carried out to identify a sustainable soil management system for cotton production in the region. The experiment was carried out in Palmas de Monte Alto (Bahia, Brazil) on an Eutrichrept soil, and consisted of eight treatments (two tillage systems and four cotton cultivars). The field lay-out was a split-plot with tillage systems as main plots and cultivars as subplots. The tillage systems consisted of conventional and reduced tillage and cotton cultivars used were 'BRS Aroeira', 'BRS 201', 'Delta Opal' and 'BRS Cedro'. No significant differences were observed between the two tillage systems for plant height, stem diameter, boll weight, yield, fiber percentage, and fiber length. Conventional tillage promoted higher fiber length and uniformity for BRS 201 as well as higher fiber resistance for the other three cultivars. On the other hand, reduced tillage promoted higher micronaire index values for Delta Opal. The BRS Cedro cultivar showed a greater plant height independently from the tillage system. In conclusion, reduced tillage allowed a sustainable soil management without compromising cotton yields and quality.Additional key words: fiber quality, Gossypium hirsutum, micronaire index, soil compaction, soil tillage. Resumen Efectos del laboreo en el desarrollo de varios cultivares de algodón en el sudoeste de Bahía, BrasilEl algodonero (Gossypium hirsutum L.r. latifolium Hutch) es muy sensible a las condiciones del suelo. El Valle del Iuiu, localizado al suroeste del estado de Bahía en Brasil, se destaca como una importante zona productora de algodón, pero el inadecuado sistema de manejo del suelo durante años y la consiguiente degradación de la calidad del suelo han ocasionado el declive de este cultivo en la región. En un esfuerzo por reestablecer este cultivo, se realizó un estudio para identificar un sistema de manejo del suelo sostenible para la producción de algodón en la región. El experimento se llevó a cabo en Palmas de Monte Alto (Bahía, Brasil) sobre un Eutrochrept, y constó de ocho tratamientos (dos sistemas de laboreo y cuatro cultivares de algodón) en un diseño experimental en bloques aleatorios, en esquema de parcela subdividida. Los sistemas de laboreo consistieron en un laboreo convencional y un laboreo reducido y los cuatro cultivares utilizados fueron 'BRS Aroeira', 'BRS 201', 'Delta Opal' y 'BRS Cedro'. No se observaron diferencias significativas entre los dos sistemas de laboreo para la altura de plantas, diá-metro del tallo, masa de capullos, productividad, porcentaje y longitud de fibras. El laboreo convencional promovió unas mayores longitud y uniformidad de fibras para BRS 201, así como una mayor resisten...

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Section: Discussionsupporting

confidence: 92%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Tillage effects on the development of several cotton cultivars in Southwest of Bahia, Brazil

Fernandes

Rezende²,

Rezende

et al. 2010

Span. j. agric. res.

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“…A cultivar Agrobel 962 apresentou a menor altura da planta e maior altura de capítulo, o que sugere a possibilidade de seu cultivo em menores espaçamentos, contribuindo, com isso, no controle de plantas daninhas (AMABILE et al, 2003). As variações observadas na altura das plantas e do capítulo entre as cultivares não se refletiram nas variáveis ligadas a produção, diâmetro do capítulo e produtividade.…”

Section: Resultsunclassified

Formas de aplicação de nitrogênio em três cultivares de girassol na savana de Roraima

Ivanoff¹,

Uchôa²,

Alves³

et al. 2010

Rev. Ciênc. Agron.

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-Nitrogen is the nutrient that limits most the production in the culture of sunflower (Helianthus annuus L). The nutritional requirements among cultivars of the same species is distinct, under the same conditions of culture and for the same agricultural year. With the objective of evaluating four different ways of nitrogen application in the production components of different genotypes of sunflower, an experiment was carried out in a randomized block design in a 3 x 4 factorial scheme (genotypes x ways of nitrogen applying) with four replicates . The treatments consisted on the combination of three varieties: Agrobel 960, Agrobel 962 and V -2000 and four different ways of nitrogen application: 100% at 20 days after sowing (DAS) -(0-100-0-0); 30% at sowing and 70% at 20 DAS -(30-70-0-0); 30% at sowing, 30% at 20 DAS e 40% at 40 DAS 20% at sowing, 30% at 20 DAS,. Measured variables were: height of the plant, height of the capitulum, diameter of the stem, diameter of the capitulum and achene yield. The ways of nitrogen application affected all components of yield. The N formulation (30-70-0-0) has determined the best results for the variables studied, but the form (30-30-40-0) provided results comparable to treatment (30-70-0-0); treatments where N was applied as (20-30-30-20) caused decrease in the performance of sunflower for all variables. The varietal effect was observed only for plant height and height of the capitulum. The highest yield of achene achieved was 1.639 kg ha-1, with no superiority for the hybrids Agrobel 960 and 962 in relation to the variety 122/V2000 Embrapa.

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“…No primeiro caso, à medida foi realizada do nível do solo até a região central de cada capítulo, com auxílio de uma régua graduada e, no segundo, 10 cm acima do colo da planta, com auxilio de um paquímetro. Para determinação da curva de crescimento das plantas foi ajustada uma função logística descrita por AMABILE et al (2003).…”

Section: Methodsunclassified

Avaliação de diferentes sistemas de manejo no desenvolvimento da cultura do girassol

Fernandes

Gamero

Rodrigues

et al. 2016

Revista Brasileira De Tecnologia Aplicada Nas Ciências Agrárias

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ResumoO objetivo deste trabalho foi avaliar a influência dos sistemas de manejo e identificar a velocidade na operação de semeadura que permite o melhor desenvolvimento do girassol. O experimento foi instalado na Fazenda Experimental Lageado, pertencente à Faculdade de Ciências Agronômicas da UNESP, campus de Botucatu/São Paulo. O delineamento experimental foi em blocos ao acaso, seguindo o esquema de parcela subdividida, com quatro repetições. Os tratamentos efetuados nas parcelas foram: os sistemas de manejo do solo (semeadura direta com mecanismo sulcador tipo haste-SDh; semeadura direta com mecanismo sulcador tipo disco duplo-SDd; cultivo reduzido-CR e cultivo convencional-CC). Nas subparcelas, as velocidades utilizadas para a semeadura foram de 3; 5; 6 e 8 km h -1 . As variáveis analisadas foram: população inicial e final de plantas, altura de plantas, diâmetro do caule e produtividade de aquênios. O tratamento SDh é o sistema de manejo recomendado para a implantação da cultura e o desenvolvimento do híbrido comercial de girassol Hélio 358. O aumento da velocidade na operação de semeadura compromete a população de plantas e, conseqüentemente, o desenvolvimento da cultura.Palavras chave: velocidade de semeadura, mecanismos sulcadores, oleaginosa Evaluation of different management systens in the development of the culture of suflower AbstractThe aim of this study was to evaluate the influence of management systems and identify the speed of seeding operation that allows better development of the sunflower. The experiment was installed in Fazenda Experimental Lageado, belonging to Faculdade de Ciências Agronômicas of UNESP, Botucatu campus. The experimental design was randomized blocks, following the diagram in subdivided parcels, with four replicates. The treatments performed on the parcels were: the soil management systems (no-tillage system with scarifier shank type engine-NTs; no-tillage system with double-disk type scarifier mechanism NTd; miniumum tillage-MT and conventional tillage-CT). In the subplots, the speeds used for seeding were 3; 5; 6 and 8 km h -1 . The variables analyzed were: initial and final population of plants, plant height, stem diameter, and productivity of achenes. The NTs treatment is the management system recommended for deployment of culture and the development of commercial hybrid sunflower Hélio 358. The increased speed in the seeding operation compromises the population of plants and, consequently, the development of culture.

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Análise de crescimento de girassol em Latossolo com diferentes níveis de saturação por bases no Cerrado

Cited by 9 publications

References 8 publications

Tillage effects on the development of several cotton cultivars in Southwest of Bahia, Brazil

Tillage effects on the development of several cotton cultivars in Southwest of Bahia, Brazil

Formas de aplicação de nitrogênio em três cultivares de girassol na savana de Roraima

Avaliação de diferentes sistemas de manejo no desenvolvimento da cultura do girassol

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