Aplicação de azoto na cultura da soja

Barranqueiro, Hitalo Ribas; Dalchiavon, Flávio Carlos

doi:10.19084/rca16030

Cited by 7 publications

(6 citation statements)

References 8 publications

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“…Recent research results have shown that the application of N fertilizers does not improve the crop grain yield (Aratani et al 2008, Kaschuk et al 2016, Korber et al 2017. In contrast, other research studies have shown that the N application can improve the plant growth and crop grain yield (Parente et al 2015, Barranqueiro & Dalchiavon 2017, Moreno et al 2018. The current recommendation for soybean cultivation in Brazil is the use of inoculant containing Bradyrhizobium strains without the addition of N fertilizer, or up to the rate of 20 kg ha -1 of N at sowing, when the soil is low in organic matter (Embrapa 2011).…”

Section: Resposta De Cultivares De Soja Precoce a Adubação Nitrogenadmentioning

confidence: 99%

Response of early soybean cultivars to nitrogen fertilization associated with Bradyrhizobium japonicum inoculation

Zuffo

Steiner

Busch

et al. 2018

Pesqui. Agropecu. Trop.

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In early soybean cultivars of high productive potential, the use of chemical nitrogen (N) fertilizer may be a critical factor to meet the crop N requirements for obtaining high yields. In order to determine the response of early soybean cultivars to doses and times of nitrogen fertilizer application, associated with the inoculation of Bradyrhizobium japonicum, two field experiments were conducted in a Quartzipsamment soil from the Brazilian tropical Savannah, during the 2016/2017 and 2017/2018 growing seasons. The experimental treatments were arranged in a 2 × 3 × 4 factorial scheme, being two soybean cultivars (BRS 1074 IPRO and ST 797 IPRO), three application times of N fertilizer (sowing, 30 and 50 days after the emergence) and four N doses (0 kg ha-1, 20 kg ha-1, 40 kg ha-1 and 60 kg ha-1). The following variables were evaluated: plant height, shoot dry matter, number of nodules, nodule dry matter, first pod height, number of pods, number of grains per pod, 1,000-grain mass, grain yield and harvest index. The use of N fertilizer did not improve the production components and did not increase the soybean grain yield, regardless of the doses and times of application. Therefore, it was concluded that, if efficient strains of B. japonicum are used in areas of first soybean crop, in a Quartzipsamment soil with medium-high fertility, especially with a relatively high N availability due to the mineralization of the soil organic matter, there is no need to apply starter or late doses of nitrogen fertilizer.

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Section: Resposta De Cultivares De Soja Precoce a Adubação Nitrogenadmentioning

confidence: 99%

Response of early soybean cultivars to nitrogen fertilization associated with Bradyrhizobium japonicum inoculation

Zuffo

Steiner

Busch

et al. 2018

Pesqui. Agropecu. Trop.

View full text Add to dashboard Cite

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“…Some studies have reported that the use of N fertilizers does not improve the productive performance of the crop (Aratani et al 2008, Kaschuk et al 2016. In contrast, other research studies have shown that N fertilization can improve the soybean plant growth and grain yield (Barranqueiro & Dalchiavon 2017, Moreno et al 2018. However, there are no studies that have evaluated the N fertilizer application in soybean and the physiological and sanitary quality of the seeds.…”

Section: Abstract Resumomentioning

confidence: 99%

Quality of soybean seeds in response to nitrogen fertilization and inoculation with Bradyrhizobium japonicum 1

Zuffo

Steiner

Busch

et al. 2018

Pesqui. Agropecu. Trop.

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Nitrogen fertilization may interfere in the quality of soybean seeds. This study aimed to determine the physiological and sanitary quality of soybean seeds, in response to levels and times of nitrogen (N) application associated with Bradyrhizobium japonicum inoculation. Treatments were arranged in a randomized block design, in a 2 × 3 × 4 factorial arrangement [two soybean cultivars (BRS 1074 IPRO and ST 797 IPRO), three application times (sowing, 30 and 50 days after emergence) and four N levels (0 kg ha-1, 20 kg ha-1, 40 kg ha-1 and 60 kg ha-1), with four replicates. The 1,000-seed mass, moisture content, germination rate, seedling height, shoot length, primary root length, total seedling dry matter, electrical conductivity, mechanical damage, vigor and viability (tetrazolium test) and sanitary quality of the seeds were measured. The use of mineral N, associated with the inoculation of B. japonicum bacteria, does not prove to be consistent, in terms of its effects on the physiological quality of soybean seeds, although the incidence of pathogens may be reduced.

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“…Alguns estudos reportaram que o uso de fertilizantes nitrogenados, em doses superiores a 20 kg ha -1 de N, pode reduzir a nodulação e a eficiência da FBN, e não melhora o desempenho produtivo da cultura (HUNGRIA et al, 2006b;ARATANI et al 2008;KASCHUK et al, 2016). Por outro lado, pesquisas realizadas demonstraram que adubação nitrogenada pode melhorar o desenvolvimento e a produtividade da cultura da soja (BARRANQUEIRO; DALCHIAVON, 2017;MORENO et al, 2018). Araújo e Carvalho (2006) comentaram que em algumas situações, como em áreas de primeiro cultivo de soja, onde não existem populações de rizóbio no solo, a aplicação de baixas doses de N na semeadura (20 a 30 kg ha -1 de N) deve ser recomendada com a finalidade de disponibilizar N às plantas até o início da nodulação.…”

Section: Introductionunclassified

Adubação Nitrogenada Na Soja Inibe a Nodulação E Não Melhora O Crescimento Inicial Das Plantas

et al. 2019

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A adubação nitrogenada pode afetar o processo de simbiose da soja com bactérias do gênero Bradyrhizobium (rizóbio), alterando a eficiência da fixação biológica de nitrogênio (FBN) e o crescimento das plantas. Portanto, objetivou-se com o trabalho avaliar o efeito de doses e épocas de aplicação de nitrogênio associada à inoculação de bactérias Bradyrhizobium japonicum, na nodulação e no crescimento inicial de duas cultivares de soja. O experimento foi realizado em condições de casa-de-vegetação, em Cassilândia (MS), Brasil, durante a safra 2016/2017. O delineamento experimental utilizado foi o de blocos casualizados, disposto em esquema fatorial 2 x 3 x 4, com quatro repetições. Os tratamentos foram constituídos por duas cultivares de soja (BRS 1074 IPRO e ST 797 IPRO), três épocas de aplicação (semeadura; 30 DAE e 50 DAE) e quatro doses de nitrogênio (0, 20, 40, 60 kg ha–1 de N). Aos 65 dias após a emergência das plantas foram avaliados o número de nódulos, volume dos nódulos, matéria seca dos nódulos, densidade dos nódulos, matéria seca da parte aérea, matéria seca das raízes e volume radicular. A adubação nitrogenada na cultura da soja, independente da época de aplicação e do cultivar, inibe o número de nódulos, volume dos nódulos e matéria seca dos nódulos e não proporciona aumento do volume radicular, matéria seca da parte aérea e do sistema radicular.

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Aplicação de azoto na cultura da soja

Cited by 7 publications

References 8 publications

Response of early soybean cultivars to nitrogen fertilization associated with Bradyrhizobium japonicum inoculation

Response of early soybean cultivars to nitrogen fertilization associated with Bradyrhizobium japonicum inoculation

Quality of soybean seeds in response to nitrogen fertilization and inoculation with Bradyrhizobium japonicum 1

Adubação Nitrogenada Na Soja Inibe a Nodulação E Não Melhora O Crescimento Inicial Das Plantas

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