Marco Eustáquio de Sá

University of São Paulo, San Paulo, São Paulo, Brazil

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Publications (176)51.37 Total impact

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    Full-text · Dataset · Mar 2015
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    ABSTRACT: O sistema de semeadura direta constitui uma importante técnica para a manutenção e recuperação da capacidade produtiva de solos manejados convencionalmente e de áreas degradadas. O objetivo do trabalho foi avaliar a produção de soja e milho sobre a palhada de cinco plantas de cobertura e vegetação espontânea. Os experimentos foram instalados em Votuporanga, SP e Selvíria, MS, em março de 2008, após o preparo convencional do solo. O delineamento experimental utilizado foi o de blocos casualizados com quatro repetições, utilizando as seguintes plantas de cobertura em diferentes gastos de sementes por hectare que constituíram os tratamentos: Sorghum bicolor: 6; 7 e 8 kg ha-1, Pennisetum americanum: 10; 15 e 20 kg ha-1, Sorghum sudanense: 12; 15 e 18 kg ha-1, híbrido de S. bicolor com S. sudanense: 8; 9 e 10 kg ha-1, Urochloa ruziziensis: 8; 12 e 16 kg ha-1. Também se utilizou um tratamento controle com vegetação espontânea. Após o manejo das coberturas, no primeiro ano de estudo foi semeada a soja e no segundo ano semeou-se o milho, ambos em sistema de semeadura direta. Avaliou-se a matéria seca acumulada pelas diferentes coberturas, e as características agronômicas da soja e do milho. Concluiu-se que as diferentes coberturas mostraram-se como boas opções de plantas de cobertura antecessoras à cultura da soja em Votuporanga, SP e a cultura do milho em Selvíria, MS, e que os diferentes gastos de sementes utilizados para cada planta de cobertura propiciaram diferenças em relação às características agronômicas das culturas da soja e do milho.
    Full-text · Article · Jan 2015 · Revista Ciencia Agronomica
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    ABSTRACT: A busca por novas tecnologias que visem a diminuir os custos de produção de sementes é de fundamental importância. O presente estudo objetivou avaliar a viabilidade econômica da produção de sementes de soja enriquecidas com molibdênio. Foram utilizadas a cultivar BRS Valiosa RR e quatro doses de molibdênio (0 g ha-1, 200 g ha-1, 400 g ha-1 e 800 g ha-1), em duas aplicações via foliar: metade no estádio R3 e metade em R5-4. Foram estimados o custo operacional total, receita bruta, lucro operacional, índice de lucratividade, produtividade de equilíbrio e preço de equilíbrio. Concluiu-se que a aplicação foliar de molibdênio é uma forma economicamente viável de produção de sementes de soja enriquecidas com esse micronutriente.
    Preview · Article · Jan 2015
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    ABSTRACT: The search for new technologies that reduce costs to produce seeds is very important. This study aimed to analyze the economic viability of producing soybean seeds enriched with molybdenum. The BRS Valiosa RR cultivar was used and four molybdenum doses (0 g ha-1, 200 g ha-1, 400 g ha-1 and 800 g ha-1) were applied on leaves as it follows: half in the R3 and half in the R5-4 development stages. The total operating cost, gross revenue, operating profit, profitability index, break-even yield and break-even price were estimated. The results showed that the molybdenum foliar application is an economically viable way of producing molybdenum-enriched soybean seeds. © 2015, Universidade Federal De Goias (UFG). All rights reserved.
    No preview · Article · Jan 2015
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    ABSTRACT: The no-tillage system is an important technique for maintaining and restoring the productive capacity of conventionally managed soils and degraded areas. The aim of this study was to evaluate the production of soy and maize grown on the straw of five cover crops and on spontaneous vegetation. The experiments were carried out in Votuporanga, in the state of Sao Paulo and in Selviria, in Mato Grosso do Sul, Brazil, in March 2008, after conventional soil preparation. The experimental design was of randomised blocks with four replications, using the following cover crops in different amounts of seed per hectare, to make up the treatments: Sorghum bicolor - 6, 7 and 8 kg ha(-1); Pennisetum americanum - 10, 15 and 20 kg ha(-1); Sorghum sudanense - 12, 15 and 18 kg ha(-1); S. bicolor and S. sudanense hybrid - 8, 9 and 10 kg ha(-1); and Urochloa ruziziensis - 8, 12 and 16 kg ha(-1). A control treatment with spontaneous vegetation was also used. After management of the cover crops, soy was planted in the first year of the study, and maize sown in the second, both under a no-tillage system. The dry matter accumulated by the different cover crops, and the agronomic characteristics of the soy and maize were all evaluated. It was concluded that the different cover plants proved to be good options for preceding the soy crop in Votuporanga, SP and the maize in Selviria, MS, and that the different amounts of seed used for each cover crop resulted in differences in relation to the agronomic characteristics of the crops of soy and maize.
    No preview · Article · Jan 2015 · Revista Ciencia Agronomica
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    ABSTRACT: This study aimed to evaluate soil cover and the suppressive effect on weeds by different cover crops at different seed densities. The experiments were set up in Votuporanga, state of Sao Paulo, Brazil and in Selviria, state of Mato Grosso do Sul, Brazil, in March 2008, after conventional tillage. The experimental design was a randomized complete block with four replications, using the following cover crops at different seed densities per hectare: Sorghum bicolor: 6, 7 and 8 kg ha(-1), Pennisetum americanum, 10, 15 and 20 kg ha(-1), Sorghum sudanense, 12, 15 and 18 kg ha(-1), hybrid of Sorghum bicolor with Sorghum sudanense: 8, 9 and 10 kg ha(-1), Urochloa ruziziensis: 8, 12 and 16 kg ha(-1). A control treatment with spontaneous vegetation was used. Soybean was sown after the management of cover crops. Dry matter and weed density were evaluated at cutting/harvesting of cover crops. In Votuporanga, another assessment of weed plants was made at 35 days after soybean had been sown. The ground cover provided by cover crops was assessed at the time of desiccation and flowering of soybeans. It was concluded that U. ruziziensis and S. sudanense reduced weed infestations by more than 90% and kept ground cover above 80% by the time of flowering of soybean.
    No preview · Article · Oct 2014 · Planta Daninha
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    ABSTRACT: The foliar application of micro- and macronutrients is often practiced by farmers to improve yield and seed physiological potential. For calcium and molybdenum, positive results have been observed, even in soils with high nutrient content. The purpose of this study was to assess the effects of foliar applications of calcium and molybdenum on yield and seed physiological potential in common bean plants. A randomized block design was implemented, with the treatments fixed in a factorial scheme: two molybdenum rates (with or without) and four calcium rates, with four replications. The calcium rates applied on the leaves were 0, 150, 300 and 600 g·ha-1 for the first year of the investigation (2005) and 0, 300, 600 and 900 g·ha-1 for the second year (2006). In both years, the molybdenum rates applied on the leaves were 0 g·ha-1 (without) and 75 g·ha-1 (with). The results showed that the foliar calcium application, with or without molybdenum, did not improve yield. Foliar application of calcium alone improved seed physiological potential in common bean plants when applied at the full bloom stage.
    Full-text · Article · Sep 2014 · Agricultural Sciences
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    ABSTRACT: This study evaluates the effects of different nitrogen (N) rates (0, 50, 100, 150, and 200 kg ha−1) and sources (ammonium sulfate, urea, and ammonium sulfonitrate with a nitrification inhibitor, Entec®) applied either as a single application during sowing (next to the planting rows) or as side dressing (stage 3.2 on Zadok scale), on production components and grain yield of irrigated wheat grown under no-till in a low-elevation Brazilian cerrado and Dark Red Dystrophic Latosol with clayey-texture. It was adopted a randomized block design (5 × 3 × 2) in factorial scheme with four replications. The N sources provided similar grain yields and chlorophyll contents. Increased nitrogen rates increased grain yield up to the 120 kg N ha−1, regardless of application time and N source. Nitrogen fertilization as side dressing can be recommended based on leaf chlorophyll readings. Early application of all nitrogen fertilizers at sowing time was viable.
    Full-text · Article · Jun 2014 · Journal of Plant Nutrition
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    Preview · Article · Mar 2014

  • No preview · Article · Feb 2014
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    ABSTRACT: Os efeitos promovidos pelas plantas de cobertura nos atributos químicos do solo são bastante variáveis, dependendo de fatores como espécie utilizada, manejo dado à biomassa, época de plantio e corte das plantas, tempo de permanência dos resíduos no solo, condições locais e interação entre esses fatores. Este trabalho foi realizado com o objetivo de avaliar a absorção de nutrientes por cinco plantas de cobertura, que foram utilizadas para produção de grãos, sementes e forragem, em diferentes quantidades de sementes por hectare e pela vegetação espontânea, bem como para o efeito sobre as propriedades químicas de dois Latossolos, cultivadas em rotação com as culturas da soja e do milho. Os experimentos foram instalados em Votuporanga, SP, e Selvíria, MS, em março de 2008, após o preparo convencional do solo. O delineamento experimental utilizado foi o de blocos casualizados com quatro repetições, utilizando as seguintes plantas de cobertura em diferentes quantidades de sementes por hectare que constituíram os tratamentos: sorgo granífero: 6, 7 e 8 kg ha-1; milheto: 10, 15 e 20 kg ha-1; capim-sudão: 12, 15 e 18 kg ha-1; híbrido de sorgo com capim-sudão: 8, 9 e 10 kg ha-1; e Urochloa ruziziensis: 8, 12 e 16 kg ha-1. Também se utilizou um tratamento-controle com vegetação espontânea. Após o manejo das coberturas, no primeiro ano de estudo, foi semeada a soja e, no segundo ano, semeou-se o milho, ambos em sistema de semeadura direta. Avaliaram-se a produtividade de matéria seca das diferentes coberturas, a absorção de nutrientes pelas coberturas e as alterações químicas no solo. Constatou-se que em solos argilosos, com elevado teor de alumínio no solo, como em Selvíria, o capim-sudão, com 18 kg ha-1 de sementes, e o sorgo granífero, com 6 kg ha-1, em associação a calagem, contribuem para redução do teor de alumínio e da acidez potencial e para elevação da saturação por bases. As diferentes quantidades de sementes de cada planta de cobertura não influenciaram a produtividade de matéria seca da mesma planta de cobertura, mas interferiram na absorção de nitrogênio do híbrido de sorgo com capim-sudão, com 10 kg ha-1 de sementes, apresentando menor absorção que com 8 kg ha-1 de sementes, e também no teor de matéria orgânica no solo, com o capim-sudão, com 15 kg ha-1 de sementes, propiciando maior teor que o de 18 kg ha-1 de sementes.
    Full-text · Article · Feb 2014 · Revista Brasileira de Ciência do Solo
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    ABSTRACT: Este trabalho foi realizado com o objetivo de avaliar a cobertura do solo e o efeito supressivo sobre plantas daninhas utilizando plantas de cobertura, em diferentes densidades de semeadura. Os experimentos foram instalados em Votuporanga-SP e Selvíria-MS, em março de 2008, após o preparo convencional do solo. O delineamento experimental utilizado foi o de blocos casualizados com quatro repetições, onde as plantas de cobertura com diferentes densidades de semeadura constituíram os tratamentos: Sorghum bicolor : 6, 7 e 8 kg ha-1; Pennisetum americanum: 10, 15 e 20 kg ha-1; Sorghum sudanense: 12, 15 e 18 kg ha-1; híbrido de S. bicolor com S. sudanense: 8, 9 e 10 kg ha-1; Urochloa ruziziensis: 8, 12 e 16 kg ha-1; e um tratamento controle com vegetação espontânea. Após o manejo das coberturas, foi semeada a soja. Avaliou-se a biomassa seca e densidade das plantas daninhas no momento do corte/colheita das plantas de cobertura. Em Votuporanga, também foi feita uma avaliação das plantas daninhas aos 35 dias após a semeadura da soja. A cobertura do solo proporcionada pelas coberturas foi avaliada no momento da dessecação e no florescimento da cultura da soja. Concluiu-se que U. ruziziensis e S. sudanense reduziram a infestação das plantas daninhas em mais de 90% e mantiveram a cobertura do solo superior a 80% até o florescimento da cultura da soja.
    Full-text · Article · Jan 2014 · Planta Daninha
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    Preview · Article · Oct 2013
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    Denis Santiago da Costa · Rafael Marani Barbosa · Marco Eustáquio de Sá
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    ABSTRACT: Common bean is an important crop in Brazil primarily because of its nutritional characteristics. Some agronomic practices, such as weed management, are fundamental to cultivation, as a means of obtaining a high crop yield. However, some studies have shown that weed management may alter the function of the cultivar cycle. Thus, this study aimed at determining the optimal phenological stage in early-maturing common bean cultivars to perform the weed control without providing reductions in yield and seed quality. The experimental design was randomized blocks with 20 treatments and four replications, in a 2×2×5 (cultivars × types of weed control × periods of weed control) factorial scheme. The periods of weed control for both cultivars (Carioca Precoce and IPR-Colibri) consisted of full cycle weeded (control), weed control at the V4-3 stage (first three nodes on the main stem with trifoliate leaves), at the R5 stage (beginning of bloom) and at the R8 stage (appearance of pods) and full cycle unweeded (no weed control). The types of weed control used were chemical (fluazifop-p-butyl + fomesafen) and mechanical (hoe). The Carioca Precoce cultivar demonstrated higher agronomic performance and yield than the IPR-Colibri cultivar, although the IPR-Colibri seeds had a higher vigor. The type of weed control (chemical or mechanical) did not affect the agronomic characteristics, yield and seed physiological potential of the cultivars. The ideal period for weed control in early-maturing common bean cultivars to obtain a higher yield and seed physiological potential was observed at the V4-3 phenological stage.
    Full-text · Article · Mar 2013
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    ABSTRACT: The survey was conducted during the winter of 2010 and 2011 in Selvíria, Mato Grosso do Sul State, Brazil. The experimental design was a randomized block in a split plot with four replications. The plots consisted of: millet, sun hemp, pea, velvet bean, millet + pigeon pea, millet and millet + Crotalaria and Mucuna fallow. The subplots were represented by the absence of phosphate fertilizers and doses of P2O5 (60, 90 and 120 kg ha-1) in the form of monoammonium phosphate (MAP). Were evaluated: plant cover, dry matter of plants, components production, total P in shoots and productivity. It was concluded that Crotalaria juncea, the consortium millet + black velvet bean (Mucuna aterrima) and millet + Crotalaria juncea, produced sufficient amount of dry matter to make possible the no-tillage system and the use of straw Crotalaria juncea, millet + Crotalaria juncea and millet + velvet bean as cover crops provided better development and production of bean winter saving the application of phosphorus in no-tillage system.
    No preview · Article · Jan 2013 · Revista Brasileirade Ciencias Agrarias
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    Full-text · Article · Dec 2012 · Revista Brasileirade Ciencias Agrarias
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    ABSTRACT: Chemical composition of seed displays, in general, the same compounds found in other parts of the plant, and the environment where they grow plants, fertilizer and many other factors are able to change this constitution, increasing or decreasing the amount of certain components. The study aimed to determine the effect of application by seed doses of calcium and molybdenum on protein content of peanut seeds cv.IAC 886. The experimental design was randomized blocks in a factorial design with four replicates per treatment, which are constituted by the combination of molybdenum doses (0, 50, 100 and 150 g ha(-1)) and calcium by seeds (0, 1000, 2000 and 3000 mg L-1). The peanut harvest was done manually. Seeds were removed from the pod manually and individually for each treatment and were taken to the Laboratorio de Genetica de Populacoes e Silvicultura, do Departamento de Fitotecnia, Tecnologia de Alimentos e Socio-Economia, da Faculdade de Engenharia de Ilha Solteira da Universidade Estadual Paulista, where we determined the protein (albumin-Alb, prolamin-PRO, glutelin-GLU and globulin-GLO, mg g(-1). Regardless of the doses used the albumin protein fraction showed the highest in the peanut seeds. The addition of molybdenum resulted in increased seed prolamin content in the peanut seeds. The combination of calcium and molybdenum applied to seeds resulted in increased levels of albumin, globulin and glutelin in the peanut seeds.
    Preview · Article · Nov 2012 · SEMINA: CIENCIAS AGRARIAS
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    ABSTRACT: Information regarding the use of growth regulators in sunn hemp is still scarce, especially on the physiologic quality of seeds and growth seedlings. In this aspect, product knowledge and application rate stands out as relevant factors in production of quality seeds. This work aimed to evaluated the effect of the foliar application of growth regulators (mepiquat chloride, etil-trinexapac and paclobutrazol) in different rates (0; 75; 150; 225 and 300 g ha-1), on the physiological quality of seeds and growth seedlings of Crotalaria juncea cultivated in no-tillage system. The treatments were disposed in randomized complete block design in factorial scheme 3 x 5 (regulators x rates of application), with four replications. The results were submitted to the variance analysis, with the growth regulators compared by Tukey test and the rates for polynomial regression. Not if recommended the application of mepiquat chloride in sunn hemp culture by reducing the potential of seeds germination and dry biomass of seedlings. The etil-trinexapac must be applied in rate of 300 g ha-1, based on the reduction of moisture content and the electrical conductivity of seeds, the greater total length of seedlings and dry biomass of seedlings. The paclobutrazol must be applied in rate of 75 g ha-1, considering the potential and speed of seeds germination. © 2012, Universidade Federal de Uberlandia. All Rights Reserved.
    No preview · Article · Sep 2012
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    ABSTRACT: Cover crops are used for the purpose of land cover in order to improve the physical, chemical and biological properties of cultivated soils and improve the sustainability of grain production. The objective of this study was to evaluate the effect of different cover crops and the sowing of beans on the characteristics of three cultivars of commom bean in no tillage sistem. The research was develop in Fazenda de Ensino Pesquisa da Faculdade de Engenharia-UNESPCâmpus de Ilha Solteira. The experimental design was completely randomized blocks and treatments were arranged in bands in 5x2x3 factorial design with four replications. The treatments consisted of cover crops (millet, jack bean, sunn hemp, velvet bean and fallow), sowing of beans (Pérola, IAC Tunã, Carioca Precoce) grown in two years. Were evaluated: the final stand of plants, number of pods per plant, number of seeds per pod and per plant, weight of 100 seeds and seed yield. The cover crops sunn hemp and millet showed higher amount of fresh biomass in both years of cultivation, being recommended for our region. Occurring variations in the productivity of seeds depending on the years of cultivation, but the IAC Tuna was more stable in the variables analyzed.
    No preview · Article · Sep 2012 · Bioscience Journal
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    Full-text · Article · Jun 2012

Publication Stats

473 Citations
51.37 Total Impact Points

Institutions

  • 2014
    • University of São Paulo
      San Paulo, São Paulo, Brazil
  • 1998-2014
    • São Paulo State University
      • • Department of Plant Science, Food Technology and Socio Economics
      • • Departamento de Produção e Melhoramento Vegetal
      • • Faculty of Engineering
      • • Faculdade de Engenharia de Ilha Solteira
      San Paulo, São Paulo, Brazil
  • 2004
    • State University of Mato Grosso
      Vila Real do Senhor Bom Jesus de Cuiabá, Mato Grosso, Brazil