Inoculantes e fertilizantes foliares na soja em área de populações estabelecidas de Bradyrhizobium sob sistema plantio direto

Campos, Ben-Hur Costa de; Gnatta, Valderi

doi:10.1590/s0100-06832006000100008

Cited by 14 publications

(13 citation statements)

References 4 publications

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“…It can be explained by the highest efficiency of the inoculant when applied at sowing, verified by the highest number of nodules. Similar results were also observed in other studies (Viera-Neto et al, 2008a;Campos & Gnatta, 2006). Benefits are also observed in the rhizobia-legume symbiosis; in the case of soybean, it is found a higher number of cells and greater diversity of the Bradyrhizobium genus, higher number and weight of formed nodules, deeper distribution of nodules across the soil profile and higher BNF rates by the soybean plants (Hungria, Nogueira & Araujo, 2013).…”

Section: Discussionsupporting

confidence: 88%

“…In this case, the soybean yield increased at 10% in terms of grain production. Campos & Gnatta (2006), observed that the inoculation made in the sowing furrow could minimize some deleterious effects of the seed chemical treatments. They also verified a better crop performance when high amounts of Bradyrhizobium cells were inoculated together with the soybean seeds (up to 2.5 million cells per seed).…”

Section: Discussionmentioning

confidence: 99%

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Biological nitrogen fixation and agronomic features of soybean (Glycine max (L.) Merr.) crop under different doses of inoculant

Pedrozo¹,

Oliveira²,

Alberton³

2018

Acta Agron.

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Soybean is one of the most important crops in the world and presents great versatility. This study aims to investigate the effect of the Bradyrhizobium japonicum inoculant at 0, 600 and 1200 mL ha -1 on soybean crop, with and without 1 L ha -1 calcium (Ca 41%) + 0.4 L ha -1 boron (B 14%). Plants were grown for 90 days in plastic pots with 3 kg of sand and vermiculite (v/v) autoclaved at 121 o C for 1 h. The experiment was conducted in a completely randomized design with five replications in a greenhouse. Soybean yield parameters were evaluated, such as, dry weight of shoot, root and total; plant height, nitrogen in the shoot; number and dry weight of nodules; chlorophyll index in the leaves; number of pods per plant (NPPL); number of grains per pod (NGP); and number of grains per plant (NGPL). The addition of Ca + B increased significantly NPPL, NGPL and NGP. The NPPL, NGPL were significantly increased with 600 mL ha -1 of the inoculant. The dose of 600 mL ha -1 of the inoculant combined with Ca+B significantly stimulated NPPL, NGPL and NGP. It is concluded that the productivity of soybean was increased with addition of 600 mL ha -1 inoculant, in combination with Ca and B.

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Section: Discussionsupporting

confidence: 88%

Section: Discussionmentioning

confidence: 99%

Biological nitrogen fixation and agronomic features of soybean (Glycine max (L.) Merr.) crop under different doses of inoculant

Pedrozo¹,

Oliveira²,

Alberton³

2018

Acta Agron.

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“…Independentemente da forma de aplicação do inoculante, sabe-se que os ganhos em produtividade decorrentes da inoculação, em áreas já cultivadas anteriormente com soja, são menos expressivos do que os obtidos em solos de primeiro ano (Zhang & Smith, 1997;Campos, 1999;Campos & Gnatta, 2006). Não obstante, têm-se observado ganhos médios de 4,5 % no rendimento de grãos com a inoculação em áreas já cultivadas com essa leguminosa (Embrapa, 2003).…”

Section: Introductionunclassified

Formas de aplicação de inoculante e seus efeitos sobre a nodulação da soja

Neto

Pires

Menezes³

et al. 2008

Rev. Bras. Ciênc. Solo

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RESUMOAtualmente, tem-se difundido a aplicação de inoculante no sulco de semeadura na cultura da soja, mas há poucas informações que dão suporte a essa prática e comprovam sua eficiência em diferentes ambientes manejados sob plantio direto. Este trabalho teve como objetivo avaliar a viabilidade da aplicação de inoculantes na cultura da soja, via semente e sulco de semeadura, em solo já cultivado ou não com soja.

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“…In experiments with diazotrophic bacteria, it is usual that one of the control treatments has added N, usually as high doses of urea immediately after sowing and during flowering, which causes a lower number and mass of nodules (Campos;Gnatta, 2006;Campo;Mendes, 2003). According (Fehr et al, 1971): V5 (five node and four fully developed trifoliate leaf); R3 (early pod formation); R8 (full ripening of 95% of pods); to Bottomley and Myrold (2007), some mineral forms of N in the soil such as nitrate (NO 3 -) and ammonium (NH 4 + ) can inhibit nodule formation and degrade already formed nodules, affecting BNF.…”

Section: Resultsmentioning

confidence: 99%

Co-inoculation with diazotrophic bacteria in soybeans associated to urea topdressing

et al. 2016

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Increased grain yield can be obtained via an interaction between plants and growth-promoting microorganisms. The Bradyrhizobium spp. are capable of fixing atmospheric nitrogen in soybeans [Glycine max (L.) Merril], and Azospirillum spp. induce the synthesis of phytohormones. The aim of this study was to evaluate inoculation with Bradyrhizobium and co-inoculation with Bradyrhizobium + Azospirillum brasilense in soybeans in combination with the application a topdressing of 0, 75 or 150 kg of N ha -1 of urea during the reproductive stage. Three soybean cultivars (BMX Ativa, TEC 6029 and BMX Potência), were tested in field experiments in Santa Maria, RS, Brazil, during two agricultural years (2013/2014 and 2014/2015) and two sowing times. Morphological, nodulation and yield components were evaluated. Co-inoculation increased the grain yield by 240 kg ha -1 compared with conventional inoculation. When co-inoculated, cultivars BMX Ativa, TEC 6029 and BMX Potência showed increased grain yields of 6, 4 and 12%, respectively. The application of 150 kg ha -1 of N as a topdressing increased the grain yield by 300 kg ha -1 in the co-inoculated cultivars TEC 6029 and BMX Potência, but without a financial return. When inoculated only with Bradyrhizobium, the cultivars did not respond positively to the application of urea.Index terms: Azospirillum spp.; Bradyrhizobium spp.; Glicine max (L.) Merr.; nitrogen. RESUMOO incremento na produtividade de grãos pode ser obtido pela interação entre plantas e microrganismos promotores do crescimento vegetal. Bactérias do gênero Bradyrhizobium spp. são capazes de realizar a fixação do nitrogênio em soja [Glycine max (L.) Merril], enquanto as do gênero Azospirillum spp. induzem a síntese de hormônios vegetais. O objetivo do presente trabalho foi avaliar a inoculação com Bradyrhizobium e co-inoculação com Bradyrhizobium + Azospirillum brasilense em sementes de soja associado a aplicação de 0, 75 e 150 kg de N ha -1 de ureia aplicada em cobertura no estádio reprodutivo. Três cultivares de soja (BMX Ativa, TEC 6029 e BMX Potência) foram utilizadas nos experimentos em Santa Maria, RS, Brasil, durante dois anos agrícolas (2013/2014 e 2014/2015) e duas épocas de cultivo. Foram avaliadas as características morfológicas, de nodulação e componentes da produtividade. A co-inoculação proporcionou incremento de 240 kg de grãos ha -1 em relação a inoculação convencional. Quando co-inoculadas, as cultivares BMX Ativa, TEC 6029 e BMX Potência acresceram a produtividade de grãos em 6, 4 e 12% respectivamente. A aplicação de 150 kg de N ha -1 acresceu a produtividade em 300 kg de grãos ha -1 , com a co-inoculação das cultivares TEC 6029 e BMX Potência, porém, sem retorno econômico. Os cultivares testados quando inoculados somente com Bradyrhizobium não responderam positivamente à aplicação de ureia.Termos para indexação: Azospirillum spp.; Bradyrhizobium spp.; Glycine max (L.) Merr.; nitrogênio.

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Inoculantes e fertilizantes foliares na soja em área de populações estabelecidas de Bradyrhizobium sob sistema plantio direto

Cited by 14 publications

References 4 publications

Biological nitrogen fixation and agronomic features of soybean (Glycine max (L.) Merr.) crop under different doses of inoculant

Biological nitrogen fixation and agronomic features of soybean (Glycine max (L.) Merr.) crop under different doses of inoculant

Formas de aplicação de inoculante e seus efeitos sobre a nodulação da soja

Co-inoculation with diazotrophic bacteria in soybeans associated to urea topdressing

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