Altura de manejo da pastagem, época de dessecação de Urochloa ruziziensis e adubação nitrogenada na cultura da soja em sistema integração lavoura-pecuária

Balbinot, Alvadi Antônio; Franchini, J. C.; Debiasi, Henrique

doi:10.5965/223811711522016124

Cited by 3 publications

(7 citation statements)

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“…However, under late desiccation the values of LAI at R2 stage (>5.2) were enough to reach high grain yields (Tagliapietra et al, 2018). Under similar conditions to this study, Balbinot et al (2016a) observed that earlier desiccation of U. ruziziensis pasture intensified soybean growth at the early developmental stages, but did not influence soybean biomass, shoot N concentration, and N accumulation at 60 days after emergence. Evaluating desiccation intervals of U. ruziziensis between 8 and 35 days before soybean sowing, Franchini et al (2015a) observed greater soybean biomass accumulation at 12 and 30 days after emergence with larger intervals between desiccation and soybean sowing, indicating better conditions for initial plant growth.…”

Section: Resultssupporting

confidence: 75%

“…In addition, if pasture is desiccated less than 10 days before soybean sowing, it may be difficult to cut the straw, and, consequently, the contact of the seeds with the soil is impaired by the residues (Ricce et al, 2011;Franchini et al, 2014). Early desiccation was more adequate for deposition of seeds and fertilizer, favoring plant emergence, as also confirmed by Balbinot et al (2016a).…”

Section: Resultsmentioning

confidence: 78%

“…In the other two experiments (Tables 1 and 2 LAI. In a study of Balbinot et al (2016a), earlier desiccation of U. ruziziensis increased soybean shoot biomass and N accumulation up to 30 days after plant emergence, whereas the shoot N concentration did not change at 12 and 30 days after emergence. However, greater N accumulation was observed after earlier desiccation, due to greater biomass accumulation at the beginning of the crop cycle.…”

Section: Resultsmentioning

confidence: 89%

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Soybean growth and nitrogen accumulation by soybeans in response to desiccation times of Urochloa brizantha pasture and nitrogen fertilization

et al. 2023

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The desiccation time of high-biomass pasture and nitrogen (N) fertilization of pasture and soybean can influence the soybean sowing, establishment and growth. The objective of this study was to evaluate how the time of desiccation of the preceding pasture of Urochloa brizantha cv. BRS Piatã, cultivated at three levels of N, and by the soybean N fertilization affect soybean growth and N accumulation. Three N rates (0; 150 and 300 kg ha-1), broadcast as urea on the U. brizantha pasture were evaluated separately in each N level, every one considered as one experiment. In each experiment, five times of pasture desiccation were evaluated (60; 45; 30; 15, and 1 day before soybean sowing) and two levels of soybean N fertilization: 30 kg ha-1 (urea) broadcast at sowing or without N fertilization. A randomized complete block design with five replications was used. Early desiccation of U. brizantha pasture favors the establishment of soybean and promotes an increase in biomass and N accumulation in the vegetative stages, however these differences are not observed during the grain filling, regardless the soybean N fertilization. The soybean yield was not influenced by the desiccation time. N fertilization with 30 kg ha-1 at sowing intensifies soybean growth at the vegetative phase, but after full flowering, there were no effects on biomass and grain yield, independently of the desiccation time.

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Section: Resultssupporting

confidence: 75%

Section: Resultsmentioning

confidence: 78%

Section: Resultsmentioning

confidence: 89%

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Soybean growth and nitrogen accumulation by soybeans in response to desiccation times of Urochloa brizantha pasture and nitrogen fertilization

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“…A Braquiária é uma espécie forrageira bastante utilizada pelos produtores de grãos no sistema-integração-lavoura-pecuária, entretanto são poucas as informações sobre o manejo desta espécie sobre intensidade de pastejo e efeitos na cultura da soja em sucessão (Ferreira et al, 2015;Franchini et al, 2015aFranchini et al, , 2015bBalbinot Junior et al, 2016).…”

Section: Introductionunclassified

Manejo químico de Urochloa ruziziensis consorciado com soja na savana de Roraima

Rodrigues¹,

Medeiros

Albuquerque

et al. 2018

RBHerbicidas

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Manejo químico de Urochloa ruziziensis consorciado com soja na savana de RoraimaChemical management of Urochloa ruziziensis intercropping in soybean crop in savanah of Roraima Resumo -O objetivo do estudo foi avaliar o manejo químico de Urochloa ruziziensis consorciado com soja em sistema de plantio direto na savana de Roraima. O experimento foi conduzido em campo, em área experimental localizada no município de Boa Vista -RR, no ano de 2015. Os tratamentos consistiram da combinação de quatro doses do herbicida glyphosate (720; 1.200; 1.680 e 2.160 g ha -1 de i.a) pulverizado antes da semeadura da soja como dessecante e cinco doses do herbicida fenoxaprop -p-ethyl (0; 38,5; 77; 115,5 e 154 g ha -1 de i.a.) pulverizado 32 dias após a emergência da cultura em pós-emergência. O delineamento experimental foi o de blocos completos casualizados no esquema de parcelas subdivididas, com quatro repetições. Para a cultura da soja foram avaliados a altura de plantas, altura de inserção da 1 a vagem, número de vagens por planta, número de grãos por vagem, massa de 100 grãos e produtividade de grãos em kg ha -1 . Para a U. ruziziensis foram avaliadas a massa de forragem fresca e seca aos 70 dias após a colheita da soja e expressa em kg ha -1 . Conclui-se que, para as condições do cerrado de Roraima, apenas a aplicação do glyphosate na dose de 1.387,64 g ha -1 , aplicado em pós-emergência na cultura da soja, garante máxima produtividade de grãos (3.660,07 kg ha -1 ) e de massa fresca (10.136,22 kg ha -1 ) e seca (2.404,63 kg ha -1 ) de U. ruziziensis para formação de cobertura do solo para o próximo plantio, necessário para garantir a sustentabilidade do sistema produtivo. Palavras-chave: cobertura vegetal, componentes de produção, dessecação, forrageiras Abstract -The objective of the study was to evaluate the chemical management of Urochloa ruziziensis intercropped with soybean under no tillage system in the Roraima savanna. The experiment was conducted in an experimental area located in the municipality of Boa Vista -RR, in the year 2015. The treatments consisted of the combination of four doses of the herbicide glyphosate (720; 1.200; 1.680 and 2.160 g ha -1 of i.a) sprayed prior to sowing the soybean as a desiccant and five doses of the herbicide fenoxaprop-p-ethyl (0; 38.5; 77; 115.5 and 154 g ha -1 of i.a) sprayed 32 days after emergence of the post-emergence crop. The experimental design was a randomized complete block in the subdivided plots scheme, with four replications. For the soybean crop were evaluated the height of plants, height of insertion of the first pod, number of pods per plant, number of grains per pod, mass of Rodrigues et al. Rev. Bras. Herb., v.17, n.2, e581, abr./jun. 2018 2/11

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“…With a greater extraction of nutrients, its growth can be beneficed, but, with competition each other, it is limiting factor to accumulation of mass in its aerial part or root. Nowadays, Urochloa grasses are widely used aiming dry mass to no-till farming of soybean culture, as reported by Balbinot et al (2016). It is remarkable that is necessary an efficient desiccation to avoid the presence of grasses competing with the soybean culture.…”

Section: Resultsmentioning

confidence: 99%

Density of Competition between Species of Urochloa Sp. in Soybean Cultivation

2018

Aust. J. Basic & Appl. Sci.

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Soybean (Glycine max (L.) Merrill) highlights in Brazilian agricultural sector, because of its importance as source of protein and vegetal oil for food security alongside corn, compounding the base of ration formulation for animals. Also, due to the development in human nutrition sector, soybean and corn are used in formulation of different foods. (Costa and Brum, 2008). During its growing period, soybean is subjected to abiotic stress such as herbivorous animals as well as invasive plants competition. Understanding the involved tools in competition between species is fundamental in agricultural systems, remarkably association between plants with different characteristics. Plants often compete with each other (intraspecific) and with other plants (interspecific) for the environmental resources, in many cases vith the allelopathic effect between species (Nepomuceno et al., 2017; Abdelmigid and Morsi, 2017). Duration of the competition time negatively influences on the development and on the yield of the culture (Almeida et al., 2014). This competition between plants leads to damages in its physiology, mainly in the decrease in chlorophyll index (Nogueira et al., 2010; Lisboa et al., 2017) and stomata conductance (Jumrani et al., 2017), which initiate a breakdown in the shape and development of soybean. Competition level in grass-culture associations depends on the intervention of factors linked to the weed community, which involves specific composition, distribution, specie, density, phase and duration of intercultural living, as well as depends on climatic conditions and treatments (Figueiredo et al., 2013). The competition released by weed is named grass competition, a problem that may initiates significant 90% loss of the yield. It also can cause problems in grains quality. That way, it is important to know the soybean cycle, so that, it is possible to know in which moment the greatest interference of weeds occurs. Managing weeds is an essential step to guarantee higher performances, especially in chemical control, once this is the more practical and efficient method (Franco et al., 2017). This work aimed to evaluate effects of density of competition between species of Urochloa sp. in soybean cultivation. MATHERIAL AND METHODS Installing the experiment: The experiment was carried out in the Vegetation House of the College of Technology and Agricultural Sciences, in São Paulo State University (Unesp), in Dracena, Brazil, in October, 2016. A completely randomized design was installed, in a 3x5 factorial scheme, with 3 different grasses species: Urochloa brizantha cv. Marandu and Piatã and Urochloa ruziziensis; and 5 different densities of grasses, with 5 repetitions, summing 75 plots or vases. BMX Potência soybean cultivar was used; it was sowed three centimeters deep in vases with 9.0 dm³ capacity and 490.6 cm² area. All vases were filled with sifted soil, originally classified as Argillaceous Ferric yellow red (Embrapa, 2013), with the following chemical attributes: pH CaCl2= 4.5; MO g/dm-3 = 4.5; P mg/dm-3 (re...

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Altura de manejo da pastagem, época de dessecação de Urochloa ruziziensis e adubação nitrogenada na cultura da soja em sistema integração lavoura-pecuária

Cited by 3 publications

References 10 publications

Soybean growth and nitrogen accumulation by soybeans in response to desiccation times of Urochloa brizantha pasture and nitrogen fertilization

Soybean growth and nitrogen accumulation by soybeans in response to desiccation times of Urochloa brizantha pasture and nitrogen fertilization

Manejo químico de Urochloa ruziziensis consorciado com soja na savana de Roraima

Density of Competition between Species of Urochloa Sp. in Soybean Cultivation

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