Crescimento da soja influenciado pela adubação nitrogenada na cultura, pressão de pastejo e épocas de dessecação de Urochloa ruziziensis

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

doi:10.18227/1982-8470ragro.v9i2.2611

Cited by 5 publications

(8 citation statements)

References 6 publications

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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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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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“…These results strengthen again that mineral N fertilization is unnecessary for soybean, increasing costs without benefits to the crop. N fertilization at soybean sowing was not effective, regardless of the cover crop, as also observed Werner et al (2016) andConte (2015b). In addition, N fertilizer can negatively affect nodulation, thus reducing grain yield (Kaschuk, Nogueira, Luca, & Hungria, 2016;Saturno et al, 2017).…”

Section: Grain Yield and Oil And Protein Concentrationsmentioning

confidence: 72%

Precrops and N-fertilizer impacts on soybean performance in tropical regions of Brazil

et al. 2022

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Precrops have different growth patterns, nitrogen (N) requirements, and production of residues varying in amounts and quality that may affect the N-clycling and the soybean (Glycine max L. Merrill) cropped in succession. This study aimed to evaluate the effect of precrops and N fertilization on soybean performance. An experiment was conducted in Londrina, Paraná State, Brazil, with six precrops treatments: fallow, ruzigrass (Urochloa ruziziensis), showy rattlebox (Crotalaria spectabilis), corn (Zea mays) without or with 80 kg ha−1 of N at topdressing as urea, and wheat (Triticum aestivum). Subplots consisted of two levels of N fertilization at soybean sowing: 0 and 30 kg ha−1 of N as ammonium nitrate at sowing. Urochloa ruziziensis as precrops increased the soybean yield (5,171 kg ha-1) when compared with corn (4,346 kg ha-1) and fallow (4,467 kg ha-1). In 2016/17, N fertilization of soybean with 30 kg ha−1 of N at sowing, although increasing the initial plant growth (745 kg ha-1 with vs. 662 kg ha-1 without), impairs nodulation (100 mg pl-1 with vs. 130 g pl-1 without) and does not increase grain yield. Oil and protein concentrations in soybean grains are not influenced by precrops and N fertilization at sowing. We found that the use Urochloa ruziziensis as cover crop in soybean precrops is a good recommendation option in tropical regions of Brazil, because increasing the yield of soybean grown in succession. N fertilization at in soybean sowing it should not be recommended even in the presence of a large amount of straw.

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“…The desiccation of pasture as close as soybean sowing reduced plant biomass and, consequently, N accumulation in shoots. According to Franchini et al (2015a), the desiccation of U. ruziziensis between 8 and 35 days before soybean also had no effect on soybean shoot N concentration. This was probably due to the effect of N dilution in the biomass, i.e., the increase in N availability can increase biomass production without increasing the tissue concentration of this nutrient (Foloni et al, 2016).…”

Section: Resultsmentioning

confidence: 98%

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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Crescimento da soja influenciado pela adubação nitrogenada na cultura, pressão de pastejo e épocas de dessecação de Urochloa ruziziensis

Cited by 5 publications

References 6 publications

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

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

Precrops and N-fertilizer impacts on soybean performance in tropical regions of Brazil

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

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