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Id: biblio-1254948
Autor: Castillo, Tania; García, Andrés; Padilla-Córdova, Claudio; Díaz-Barrera, Alvaro; Peña, Carlos.
Título: Respiration in Azotobacter vinelandii and its relationship with the synthesis of biopolymers
Fonte: Electron. j. biotechnol;48:36-45, nov. 2020. ilus, tab.
Idioma: en.
Projeto: CONACYT-FONCICYT; . DGAPA-UNAM; . FONDECYT.
Resumo: Azotobacter vinelandii is a gram-negative soil bacterium that produces two biopolymers of biotechnological interest, alginate and poly(3-hydroxybutyrate), and it has been widely studied because of its capability to fix nitrogen even in the presence of oxygen. This bacterium is characterized by its high respiration rates, which are almost 10-fold higher than those of Escherichia coli and are a disadvantage for fermentation processes. On the other hand, several works have demonstrated that adequate control of the oxygen supply in A. vinelandii cultivations determines the yields and physicochemical characteristics of alginate and poly(3-hydroxybutyrate). Here, we summarize a review of the characteristics of A. vinelandii related to its respiration systems, as well as some of the most important findings on the oxygen consumption rates as a function of the cultivation parameters and biopolymer production.
Descritores: Respiração
Biopolímeros/biossíntese
Azotobacter vinelandii/fisiologia
-Poliésteres
Alginatos
Bactérias Gram-Negativas/fisiologia
Hidroxibutiratos
Fixação de Nitrogênio
Tipo de Publ: Revisão
Responsável: CL1.1 - Biblioteca Central


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Id: biblio-1129897
Autor: Lodeiro, Aníbal R.
Título: Interrogantes en la tecnología de la inoculación de semillas de soja con Bradyrhizobium spp / Queries related to the technology of soybean seed inoculation with Bradyrhizobium spp
Fonte: Rev. argent. microbiol;47(3):261-273, set. 2015. ilus.
Idioma: es.
Resumo: With the aim of exploiting symbiotic nitrogen fixation, soybean crops are inoculated with selected strains of Bradyrhizobium japonicum, Bradyrhizobium diazoefficiens or Bradyrhizobium elkanii (collectively referred to as Bradyrhizobium spp.). The most common method of inoculation used is seed inoculation, whether performed immediately before sowing or using preinoculated seeds or pretreated seeds by the professional seed treatment. The methodology of inoculation should not only cover the seeds with living rhizobia, but must also optimize the chances of these rhizobia to infect the roots and nodulate. To this end, inoculated rhizobia must be in such an amount and condition that would allow them to overcome the competition exerted by the rhizobia of the allochthonous population of the soil, which are usually less effective for nitrogen fixation and thus dilute the effect of inoculation on yield. This optimization requires solving some queries related to the current knowledge of seed inoculation, which are addressed in this article. I conclude that the aspects that require further research are the adhesion and survival of rhizobia on seeds, the release of rhizobia once the seeds are deposited in the soil, and the movement of rhizobia from the vicinity of the seeds to the infection sites in the roots

Con el fin de aprovechar la fijación simbiótica de nitrógeno, el cultivo de soja se inocula con cepas seleccionadas de Bradyrhizobium japonicum, Bradyrhizobium diazoefficiens o Bradyrhizobium elkanii (conjuntamente referidas como Bradyrhizobium spp.). El método más común de hacerlo es la inoculación en semillas, ya sea que esta se realice en el momento previo a la siembra o que se utilicen semillas preinoculadas o pretratadas mediante el tratamiento profesional de semillas. La metodología de inoculación no debe limitarse a recubrir las semillas con rizobios vivos, sino que también debe optimizar las chances de esos rizobios para infectar las raíces y nodular. Para ello los rizobios inoculados deben estar en una cantidad y un estado tales que les permitan superar la competición ejercida por los rizobios de la población alóctona del suelo, los cuales usualmente son menos eficaces para la fijación de nitrógeno y así diluyen el efecto de la inoculación sobre el rendimiento. Esta optimización requiere resolver algunos interrogantes, que son abordados en el presente artículo. Concluyo que los aspectos que requieren más investigación son la adhesión y supervivencia de los rizobios en las semillas, la liberación de los rizobios una vez que las semillas se depositan en el suelo y el movimiento de los rizobios desde las inmediaciones de las semillas hasta los sitios de infección en las raíces
Descritores: Soja/crescimento & desenvolvimento
Soja/metabolismo
Bradyrhizobium/crescimento & desenvolvimento
Bradyrhizobium/metabolismo
Inoculantes Agrícolas/metabolismo
Fixação de Nitrogênio
-Aderência Bacteriana/fisiologia
Análise de Sobrevida
Tipo de Publ: Estudo de Avaliação
Estudo Observacional
Responsável: AR635.1 - FCVyS - Servicio de Información y Documentación


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Id: biblio-1118924
Autor: CHALITA, Patrícia Bombonati; FARIAS, Eliane do Nascimento Cunha; COSTA, Ismaele Breckenfeld da; SOUSA, Brenda Ferreira; SANTOS, Marco Antônio Oliveira dos; ALBUQUERQUE, Teresinha Costa Silveira de; VITAL, Marcos José Salgado; SILVA, Krisle da.
Título: Characterization of bacterial endophytes from the roots of native and cultivated Brazil nut trees (Bertholletia excelsa)
Fonte: Acta amaz;49(4):257-267, out. - dez. 2019.
Idioma: en.
Resumo: Brazil nut is a very important nontimber forest product in the Amazon region. Propagation of this tree still represents a challenge due to slow and uneven seed germination. In this context, plant growth-promoting bacteria can facilitate the process of propagation. The aims of this study were to isolate and characterize endophytic bacteria from the roots of Brazil nut trees in native terra firme forest and cultivation areas in northern Brazil, and to identify mechanisms by which bacteria act in plant growth promotion. Overall, 90 bacterial isolates were obtained from the roots of Brazil nut trees in monoculture, agroforestry and native forest areas by using different semisolid media. The isolates were characterized by sequencing the 16S rRNA gene. Plant growth-promoting characteristics were evaluated by the presence of the nifH gene, aluminum phosphate solubilization and the production of indole compounds. The isolates were affiliated with 18 genera belonging to 5 different classes (α-Proteobacteria, ß-Proteobacteria, γ-Proteobacteria, Bacilli and Actinobacteria). The genus Bacillus was predominant in the forest and monoculture areas. Fourteen isolates presented the nifH gene. Most of the bacteria were able to solubilize aluminum phosphate and synthetize indole compounds. The results indicated high diversity of endophytic bacteria present among the roots of Brazil nut trees, mainly in the agroforestry area, which could be related to soil attributes. Among the 90 isolates, the 22 that presented the best results regarding plant growth promotion traits were good candidates for testing in seedling production of Brazil nut trees. (AU)
Descritores: RNA Ribossômico 16S
Ecossistema Amazônico
Alcaloides Indólicos
Bertholletia
Fixação de Nitrogênio
Responsável: BR6.1 - BCS - Biblioteca de Ciências da Saúde


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Id: biblio-947001
Autor: Fonseca, Guilherme Godoy; Oliveira, Dâmiany Pádua; Soares, Bruno Lima; Ferreira, Paulo Ademar Avelar; Teixeira, Cícero Monti; Martins, Fábio Aurélio Dias; Moreira, Fatima Maria de Souza; Andrade, Messias José Bastos de.
Título: Resposta de cultivares de feijoeiro-comum à inoculação das sementes com duas estirpes de rizóbio / Common bean cultivars response to seed inoculation with two rhizobium strains
Fonte: Biosci. j. (Online);29(6):1778-1787, nov./dec. 2013. tab, graf.
Idioma: pt.
Resumo: Fixação simbiótica de nitrogênio pode ser uma alternativa para reduzir, ou mesmo substituir, a adubação nitrogenada do feijoeiro-comum, cultura na qual ainda há descrédito quanto aos benefícios da inoculação e que se caracteriza por aplicações de altas doses de N mineral. Com o objetivo de verificar a resposta de cultivares de feijoeiro-comum à inoculação das sementes com duas estirpes de rizóbio, foram conduzidos dois experimentos de campo na safra de inverno 2010 (Patos de Minas e Uberaba, MG). Utilizou-se o delineamento em blocos casualizados, com três repetições e esquema fatorial 8 x 3, envolvendo oito cultivares (União, Madrepérola, Supremo, Ouro Negro, Ouro Vermelho e Majestoso) e três tipos de inoculação (sementes não inoculadas e estirpes CIAT 899T e UFLA 04-173). Na floração, avaliaram-se o número e massa seca de nódulos, massa seca de parte aérea e teor e acúmulo de nitrogênio (N) na parte aérea e, na colheita, o rendimento de grãos com seus componentes primários, teor e acúmulo de N nos grãos. Constatou-se que as populações nativas promovem nodulação equivalente à das estirpes inoculadas. As estirpes CIAT 899T e UFLA 04-173 favorecem o crescimento vegetativo do feijoeiro. A estirpe CIAT 899T proporciona maior número de vagens e maior massa de grãos que a estirpe UFLA 04-173, e em Uberaba também proporciona maior rendimento de grãos. Quando a inoculação é realizada com a estirpe UFLA 04-173, as cultivares diferem quanto ao teor foliar de N. As cultivares Madrepérola, Ouro Negro e Ouro Vermelho apresentam mais nódulos e maior massa seca de parte aérea, além de maior produtividade em Patos de Minas. Ouro Negro situa-se entre as mais produtivas em Uberaba. Em Uberaba há maior acúmulo de matéria seca de nódulos e de parte aérea, mas o ambiente Patos de Minas resulta em maiores valores do rendimento de grãos e componentes.

The symbiotic nitrogen fixation can be an alternative to reduce, or even replace, the nitrogen (N) fertilization of the common bean crop, characterized by application of high doses of this nutrient. This work aimed to verify the response of common bean cultivars to the seed inoculation with two Rhizobium strains, conducting two field experiments in the winter-spring crop of 2010, at Patos de Minas and Uberaba, Minas Gerais State, Brazil. The experiment had a randomized block design, with three replications and a 8 x 3 factorial squemme, involving eight cultivars and three levels of inoculation. At flowering, it was evaluated the number of nodules, nodules dry mass, shoots dry weight, N content and accumulation in shoots and, at harvest, the grain yield and its primary components (100 grains weight, number of pods per plant, number of grains per pod) and the N content and accumulation in the grains. The Madrepérola, Ouro Negro and Ouro Vermelho cultivars present the highest number of nodules and higher dry mass; in Patos de Minas, the same cultivars show higher productivity, but in Uberaba, only Ouro Negro cultivar is among the most productive. In Uberaba there is the greater nodules dry weight and higher shoots dry matter, but the most favorable conditions in Patos de Minas results in higher values for grain yield and its components. In Uberaba, the CIAT 899T strain overcomes the UFLA 04-173 strain in relation to grain yield. In both environments, the CIAT 899T strain also shows superiority in number of pods per plant and weight of one hundred grains.
Descritores: Rhizobium
Phaseolus
Nodulação
Fixação de Nitrogênio
Responsável: BR396.1 - Biblioteca Central


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Id: biblio-974282
Autor: Santos, Alexandra de Andrade; Silveira, Joaquim Albenísio Gomes da; Guilherme, Eliezer de Araujo; Bonifacio, Aurenivia; Rodrigues, Artenisa Cerqueira; Figueiredo, Márcia do Vale Barreto.
Título: Changes induced by co-inoculation in nitrogen-carbon metabolism in cowpea under salinity stress
Fonte: Braz. j. microbiol;49(4):685-694, Oct.-Dec. 2018. tab, graf.
Idioma: en.
Resumo: ABSTRACT To mitigate the deleterious effects of abiotic stress, the use of plant growth-promoting bacteria along with diazotrophic bacteria has been increasing. The objectives of this study were to investigate the key enzymes related to nitrogen and carbon metabolism in the biological nitrogen fixation process and to elucidate the activities of these enzymes by the synergistic interaction between Bradyrhizobium and plant growth-promoting bacteria in the absence and presence of salt stress. Cowpea plants were cultivated under axenic conditions, inoculated with Bradyrhizobium and co-inoculated with Bradyrhizobium sp. and Actinomadura sp., Bradyrhizobium sp. and Bacillus sp., Bradyrhizobium sp. and Paenibacillus graminis, and Bradyrhizobium sp. and Streptomycessp.; the plants were also maintained in the absence (control) and presence of salt stress (50 mmolL-1 NaCl). Salinity reduced the amino acids, free ammonia, ureides, proteins and total nitrogen content in nodules and increased the levels of sucrose and soluble sugars. The co-inoculations responded differently to the activity of glutamine synthetase enzymes under salt stress, as well as glutamate synthase, glutamate dehydrogenase aminating, and acid invertase in the control and salt stress. Considering the development conditions of this experiment, co-inoculation with Bradyrhizobium sp. and Bacillus sp. in cowpea provided better symbiotic performance, mitigating the deleterious effects of salt stress.
Descritores: Carbono/metabolismo
Cloreto de Sódio/metabolismo
Vigna/metabolismo
Nitrogênio/metabolismo
-Microbiologia do Solo
Cloreto de Sódio/análise
Actinobacteria/fisiologia
Raízes de Plantas/crescimento & desenvolvimento
Raízes de Plantas/metabolismo
Raízes de Plantas/microbiologia
Bradyrhizobium/fisiologia
Inoculantes Agrícolas/fisiologia
Vigna/crescimento & desenvolvimento
Vigna/microbiologia
FRONTAL LOBE0
Aminoácidos/metabolismo
Fixação de Nitrogênio
Responsável: BR1.1 - BIREME


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Id: lil-788975
Autor: Orhan, Furkan.
Título: Alleviation of salt stress by halotolerant and halophilic plant growth-promoting bacteria in wheat (Triticum aestivum)
Fonte: Braz. j. microbiol;47(3):621-627, July-Sept. 2016. tab, graf.
Idioma: en.
Resumo: ABSTRACT In the current study, 18 halotolerant and halophilic bacteria have been investigated for their plant growth promoting abilities in vitro and in a hydroponic culture. The bacterial strains have been investigated for ammonia, indole-3-acetic acid and 1-aminocyclopropane-1-carboxylate-deaminase production, phosphate solubilisation and nitrogen fixation activities. Of the tested bacteria, eight were inoculated with Triticum aestivum in a hydroponic culture. The investigated bacterial strains were found to have different plant-growth promoting activities in vitro. Under salt stress (200 mM NaCl), the investigated bacterial strains significantly increased the root and shoot length and total fresh weight of the plants. The growth rates of the plants inoculated with bacterial strains ranged from 62.2% to 78.1%.Identifying of novel halophilic and halotolerant bacteria that promote plant growth can be used as alternatives for salt sensitive plants. Extensive research has been conducted on several halophilic and halotolerant bacterial strains to investigate their plant growth promoting activities. However, to the best of my knowledge, this is the first study to inoculate these bacterial strains with wheat.
Descritores: Reguladores de Crescimento de Plantas/biossíntese
Estresse Fisiológico
Bactérias/efeitos dos fármacos
Bactérias/metabolismo
Triticum/fisiologia
Triticum/microbiologia
Fenômenos Fisiológicos Bacterianos
Salinidade
-Fenótipo
Raízes de Plantas/fisiologia
Raízes de Plantas/microbiologia
Biomassa
Amônia/metabolismo
Fixação de Nitrogênio
Responsável: BR1.1 - BIREME


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Id: biblio-839377
Autor: Chauhan, Anjali; Guleria, Shiwani; Balgir, Praveen P; Walia, Abhishek; Mahajan, Rishi; Mehta, Preeti; Shirkot, Chand Karan.
Título: Tricalcium phosphate solubilization and nitrogen fixation by newly isolated Aneurinibacillus aneurinilyticus CKMV1 from rhizosphere of Valeriana jatamansi and its growth promotional effect
Fonte: Braz. j. microbiol;48(2):294-304, April.-June 2017. tab, graf.
Idioma: en.
Resumo: Abstract Aneurinibacillus aneurinilyticus strain CKMV1 was isolated from rhizosphere of Valeriana jatamansi and possessed multiple plant growth promoting traits like production of phosphate solubilization (260 mg/L), nitrogen fixation (202.91 nmol ethylene mL-1 h-1), indole-3-acetic acid (IAA) (8.1 µg/mL), siderophores (61.60%), HCN (hydrogen cyanide) production and antifungal activity. We investigated the ability of isolate CKMV1 to solubilize insoluble P via mechanism of organic acid production. High-performance liquid chromatography (HPLC) study showed that isolate CKMV1 produced mainly gluconic (1.34%) and oxalic acids. However, genetic evidences for nitrogen fixation and phosphate solubilization by organic acid production have been reported first time for A. aneurinilyticus strain CKMV1. A unique combination of glucose dehydrogenase (gdh) gene and pyrroloquinoline quinone synthase (pqq) gene, a cofactor of gdh involved in phosphate solubilization has been elucidated. Nitrogenase (nif H) gene for nitrogen fixation was reported from A. aneurinilyticus. It was notable that isolate CKMV1 exhibited highest antifungal against Sclerotium rolfsii (93.58%) followed by Fusarium oxysporum (64.3%), Dematophora necatrix (52.71%), Rhizoctonia solani (91.58%), Alternaria sp. (71.08%) and Phytophthora sp. (71.37%). Remarkable increase was observed in seed germination (27.07%), shoot length (42.33%), root length (52.6%), shoot dry weight (62.01%) and root dry weight (45.7%) along with NPK (0.74, 0.36, 1.82%) content of tomato under net house condition. Isolate CKMV1 possessed traits related to plant growth promotion, therefore, could be a potential candidate for the development of biofertiliser or biocontrol agent and this is the first study to include the Aneurinibacillus as PGPR.
Descritores: Reguladores de Crescimento de Plantas/metabolismo
Valeriana/microbiologia
Fosfatos de Cálcio/metabolismo
Lycopersicon esculentum/crescimento & desenvolvimento
Bacillales/isolamento & purificação
Fixação de Nitrogênio
-Microbiologia do Solo
Cromatografia Líquida de Alta Pressão
Lycopersicon esculentum/microbiologia
Raízes de Plantas/microbiologia
Biomassa
Bacillales/metabolismo
Rizosfera
Fungos/crescimento & desenvolvimento
Antibiose
Responsável: BR1.1 - BIREME


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Id: biblio-839348
Autor: Oliveira Júnior, Joel Quintino de; Jesus, Ederson da Conceição; Lisboa, Francy Junio; Berbara, Ricardo Luis Louro; Faria, Sergio Miana de.
Título: Nitrogen-fixing bacteria and arbuscular mycorrhizal fungi in Piptadenia gonoacantha ( Mart. ) Macbr
Fonte: Braz. j. microbiol;48(1):95-100, Jan.-Mar. 2017. tab.
Idioma: en.
Resumo: Abstract The family Leguminosae comprises approximately 20,000 species that mostly form symbioses with arbuscular mycorrhizal fungi (AMF) and nitrogen-fixing bacteria (NFB). This study is aimed at investigating and confirming the dependence on nodulation and biological nitrogen fixation in the specie Piptadenia gonoacantha (Mart.) Macbr., which belongs to the Piptadenia group. Two consecutive experiments were performed in a greenhouse. The experiments were fully randomized with six replicates and a factorial scheme. For the treatments, the two AMF species and three NFB strains were combined to nodulate P. gonoacantha in addition to the control treatments. The results indicate this species’ capacity for nodulation without the AMF; however, the AMF + NFB combinations yielded a considerable gain in P. gonoacantha shoot weight compared with the treatments that only included inoculating with bacteria or AMF. The results also confirm that the treatment effects among the AMF + NFB combinations produced different shoot dry weight/root dry weight ratios. We conclude that AMF is not necessary for nodulation and that this dependence improves species development because plant growth increases upon co-inoculation.
Descritores: Micorrizas
Bactérias Fixadoras de Nitrogênio
Fabaceae/microbiologia
-Simbiose
Nódulos Radiculares de Plantas/microbiologia
Nodulação
Fixação de Nitrogênio
Responsável: BR1.1 - BIREME


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Id: biblio-889154
Autor: Shen, Jian Ying; Liao, Jin Zhi; Guo, Li Li; Su, Rui Fang.
Título: Effects of monosulfuron-ester on metabolic processes of nitrogen-fixing cyanobacteria Anabaena flos-aquae and Anabaena azotica
Fonte: Braz. j. microbiol;48(3):544-550, July-Sept. 2017. tab, graf.
Idioma: en.
Projeto: National Natural Science Foundation of China.
Resumo: Abstract Presence of the relatively new sulfonylurea herbicide monosulfuron-ester at 0.03-300 nmol/L affected the growth of two non-target nitrogen-fixing cyanobacteria (Anabaena flos-aquae and Anabaena azotica) and substantially inhibited in vitro Acetolactate synthase activity, with IC50 of 3.3 and 101.3 nmol/L for A. flos-aquae and A. azotica, respectively. Presenting in 30-300 nmol/L, it inhibited protein synthesis of the cyanobacteria with less amino acids produced as its concentration increased. Our findings support the view that monosulfuron-ester toxicity in both nitrogen-fixing cyanobacteria is due to its interference with protein metabolism via inhibition of branch-chain amino acid biosynthesis, and particularly Acetolactate synthase activity.
Descritores: Pirimidinas/toxicidade
Compostos de Sulfonilureia/toxicidade
Anabaena/efeitos dos fármacos
Anabaena/metabolismo
Anabaena flos-aquae/efeitos dos fármacos
Anabaena flos-aquae/metabolismo
Ésteres/toxicidade
Herbicidas/toxicidade
Fixação de Nitrogênio/efeitos dos fármacos
-Anabaena/genética
Anabaena flos-aquae/genética
Aminoácidos/metabolismo
Nitrogênio/metabolismo
Responsável: BR1.1 - BIREME


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Id: biblio-966606
Autor: Viégas, Ismael de Jesus Matos; Galvão, Jessivaldo Rodrigues; Santos, Cassio Rafael Costa dos; Silva, Dioclea Almeida Seabra; Sodré, Diego Correa; Freitas, Joze Melisa Nunes de.
Título: Micronutrients content in Pueraria phaseoloides L. on soils under oil palm plantations in Tailândia, state of Pará / Acúmulo de micronutrientes em Kudzu tropical (Pueraria phaseoloides L) em solos sob plantações de dendê em Tailândia ­ Pará
Fonte: Biosci. j. (Online);34(1):59-66, jan./feb. 2018.
Idioma: en.
Resumo: The adoption of cover crops in commercial plantations has been shown to be an alternative to promote greater soil protection, enhancement in its structure and aggregation, optimization of accumulation and nutrient cycling to obtain greater production of biomass and higher nitrogen fixation. To determine the accumulation of micronutrients of Pueraria phaseoloides L., according to age, established as a soil cover in industrial oil palm crops, an experiment was carried out at Companhia Agroindustrial (CRAI) in the municipality of Tailândia, State of Pará, in an Oxisol. The experimental design was a randomized block with four replicates. The results allow to conclude that the accumulation of nutrients, except for Mn and Cu in the live Pueraria phaseoloides L. plant cover reduced over the years and those of B, Mn, Zn, and Cu were greater in the dead Pueraria phaseoloides L. plant cover and for Cl it was in the live Pueraria phaseoloides L. plant cover. The decreasing order of total micronutrient extraction was the following: Cl> Mn> B> Zn> Cu.

A adoção de plantas de cobertura em plantios comerciais tem se mostrado uma alternativa para promover ao solo maior proteção, melhorias em sua estrutura e agregação e otimização de acúmulo e ciclagem de nutrientes visando maior produção de biomassa e maior fixação de N2. Com o objetivo de determinar o acúmulo de micronutrientes puerária (Pueraria phaseoloides L.), em função da idade, estabelecida como cobertura de solo em plantações industriais de dendezeiros, instalou-se experimento na Companhia Real Agroindustrial (CRAI) no município de Tailândia, Estado do Pará, em Latossolo Amarelo. O delineamento experimental foi o de blocos ao acaso com quatro repetições. Os resultados permitem concluir que: o acúmulo de nutrientes com exceção do Mn e Cu na cobertura verde de Pueraria phaseoloides L., reduziu com o decorrer dos anos; os de B, Mn, Zn e Cu foram maiores na cobertura morta, enquanto que o de Cl na cobertura verde. A ordem decrescente da extração total de micronutrientes foi: Cl > Mn > B > Zn > Cu.
Descritores: Elaeis guineensis
Micronutrientes
Pueraria
Fabaceae
Fixação de Nitrogênio
Responsável: BR396.1 - Biblioteca Central



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