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| Registros recuperados: 2.661 | |
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| Otto,Rafael; Mariano,Eduardo; Mulvaney,Richard Lesley; Khan,Saeed Ahmad; Boschiero,Beatriz Nastaro; Tenelli,Sarah; Trivelin,Paulo Cezar Ocheuze. |
| ABSTRACT: N Fertilizer recommendations must be improved to optimize N use efficiency (NUE) for bioenergy crops. A study was conducted to test the hypothesis that sites varying in historical usage of by-product differ in soil N-supplying power and sugarcane (Saccharum spp.) responsiveness to N fertilization. Our aim was to quantify soil N availability and N fertilizer rates, sources, and application timings for their effects on sugarcane yield and NUE. Three N response trials, each involving 0 to 200 kg N ha−1, were conducted in the state of São Paulo, Brazil, at sites varying historically in the usage of vinasse. Before fertilizer application and at harvest, soil inorganic N content was quantified and potential N mineralization estimated by the Illinois... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Saccharum spp.; Illinois Soil N Test; Inorganic N; Vinasse; Mineralization. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162019000100072 |
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| Cheng,Lifeng; Wang,Qiming; Feng,Xiangyuan; Duan,Shengwen; Yang,Qi; Zheng,Ke; Liu,Zhiyuan; Liu,Zhengchu; Peng,Yuande. |
| ABSTRACT: Biological degumming is an eco-friendly, efficient, high-quality and low-cost method that has become the leading bast fiber degumming technology. However, bacterial strains with short degumming cycles, high gum removal rates and small fiber damage are few. To screen high quality microbial resources with bast-fiber biological degumming function, soil samples were collected from a continuously cultivated banana plantation and then used to be enriched by ramie and kenaf materials in turn. A selective pectin-degrading medium was used to screen for excellent bacteria. A dominant bacterial strain was identified by phenotypic and genotypic characteristics, and its biological degumming effects on ramie and kenaf were verified by a comprehensive... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Bacillus cereus; Pectinase; Bast fiber; Bio-degumming. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162018000500375 |
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| Storck,Lindolfo; Antúnez,Claudia Carolina Cabral; Guedes,Jerson Vanderlei Carús; Cargnelutti Filho,Alberto; Alvarez,Jimmy Walter Rasche. |
| ABSTRACT Estimates of diversity indices provide information on distribution, richness and abundance of species within a community. The aim of the current study was to estimate faunistic indices (richness, constancy, dominance and abundance) of the species collected by beat cloth and entomological net sampling methods in different soybean crops and to determine the sample size necessary to estimate faunistic indices. Fauna density from 100 soybeans crops located in nine municipalities in Rio Grande do Sul, Brazil, were evaluated. Thirty points, 20 meters apart from one another, were marked in the crops. At each point, insect pests and natural enemies were collected using the two sampling methods. Faunistic indices, including the average and interval... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Glycine max; Resampling; Sample size; Natural enemies; Sampling methods. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162016000600559 |
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| Landell,Marcos Guimarães de Andrade; Scarpari,Maximiliano Salles; Xavier,Mauro Alexandre; Anjos,Ivan Antônio dos; Baptista,Antônio Sampaio; Aguiar,Cláudio Lima de; Silva,Daniel Nunes da; Bidóia,Márcio Aurélio Pitta; Brancalião,Sandro Roberto; Bressiani,José Antônio; Campos,Marcelo Ferraz de; Miguel,Paulo Eduardo Martins; Silva,Thiago Nogueira da; Silva,Victor Hugo Pavelqueires da; Anjos,Luciana Oliveira Souza; Ogata,Bruna Harumi. |
| Sugarcane (Saccharum spp.) is an efficient and sustainable alternative for energy generation compared to non-renewable sources. Currently, during the mechanized harvest process, the straw left in the field can be used in part for the second generation ethanol and increasing the electric energy production. Thus, this study aimed to provide information on the potential for residual biomass cultivars of sugarcane cropping system. This study provides the following information: yield of straw, depending on the calculated leaf area index and the number of tillers per linear meter; primary energy production of several sugarcane genotypes; contribution of dry tops and leaves; biomass yield; and evaluation of fiber, cellulose, hemicellulose and lignin. Preliminary... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Straw; Genotypes; Composition. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162013000500003 |
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| Rosa,Annelise de Souza; Blochtein,Betina; Lima,Diego Kweco. |
| Although canola, (Brassica napus L.), is considered a self-pollinating crop, researchers have indicated that crop productivity increases as a result of honey bee Apis mellifera L. pollination. Given this crop's growing importance in Rio Grande do Sul State, Brazil, this work evaluated the increase in pod and seed productivity with respect to interactions with anthophilous insects and manual pollination tests. The visiting frequency of A. mellifera was correlated with the crop's blooming progression, and productivity comparisons were made between plants visited by insects, manually pollinated plants (geitonogamy and xenogamy) and plants without pollination induction. Pod set and seed production per plant were determined for each treatment. Among the 8,624... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Flower-visiting insects; Blooming; Canola productivity. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000200018 |
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| Qiao,Junyi; Tan,Zhiliang; Wang,Min. |
| Enteric methane (CH4) emissions in ruminants have attracted considerable attention due to their impact on greenhouse gases and the contribution of agricultural practices to global warming. Over the last two decades, a number of approaches have been adopted to mitigate CH4 emissions. However, the mechanisms of methanogenesis have still not been fully defined. According to the genome sequences of M. ruminantium in the rumen and of M. AbM4 in the abomasum, the pathways of carbon dioxide (CO2) reduction and formate oxidation to CH4 have now been authenticated in ruminants. Furthermore, in the light of species or genera description of methanogens, the precursors of methanogenesis discovered in the rumen and research advances in related subjects, pathways of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Methanogenesis; Carbon dioxide; Formate; Acetate; Methanol. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162014000500013 |
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| Orce,Ingrid Georgina; Debes,Mario; Sendín,Lorena; Luque,Ana; Arias,Marta; Vojnov,Adrián; Marano,María; Castagnaro,Atilio; Filippone,María Paula. |
| ABSTRACT Citrus canker, caused by Xanthomonas citri subsp. citri (Xcc), has an important economic impact on the citrus industry. Extensive information is available about the disease but, nevertheless, the study of plant-pathogen interactions could provide new information in the understanding of citrus canker disease. A new isolate has been identified, Xcc AT, which has a high genetic similarity (> 90 %) to the virulent Xcc T strain based on genetic clustering analyses of the rep-PCR fingerprinting patterns, but it does not produce cankerous lesions in Citrus limon. In this study, we compared C. limon responses to Xcc AT and to the virulent Xcc T strain at both histological and transcriptional levels. Histologically, leaves inoculated with Xcc AT... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: CDNA-AFLP; Gene expression; Canker; Plant defense; Microscopy. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162016000600552 |
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| Mascarenhas,H.A.A.; Patrício,F.R.A.; Tanaka,M.A.S.; Tanaka,R.T.; Pianoski,J.. |
| Estudou-se o efeito residual da adubação potássica e da calagem sobre a ocorrência de fungos em sementes de soja. O experimento foi instalado com a cultivar IAC-17, no ano agrícola de 1991/92, aplicando doses a lanço de O, 3,5 e 7 t/ha de calcário dolomítico e de 0, 150, 300, 450 e 600 kg/ha de K2O. As sementes colhidas no terceiro ano de cultivo, (1993/94) foram submetidas ao teste de sanidade, pelo método do papel de filtro. Observou-se que a calagem reduziu significativamente a incidência de Phomopsis sp., favorecendo, no entanto, a presença de Aspergillus sp. e de Fusarium sp.. Embora não tenham sido detectadas diferenças significativas, nos tratamentos com calagem, verificou-se redução da incidência de Cercospora kikuchii, Colltotrichum dematium var.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Patologia de semente; Doença; Fungos; Soja; Glycine max; Calagem; Adubação potássica. |
| Ano: 1995 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161995000300004 |
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| Timm,Luís Carlos; Barbosa,Emanuel Pimentel; Souza,Manoel Dornelas de; Dynia,José Flávio; Reichardt,Klaus. |
| The assessment of the relationship among soil properties (such as total nitrogen and organic carbon) taken along lines called transects is a subject of great interest in agricultural experimentation. This question has been usually approached through standard state-space methods by some authors in the soil science literature. Important limitations of the mentioned procedures used in practice are pointed out and discussed in this paper, specially those related to the model parameters, meaning and practical interpretation. In the standard state-space approach, based on an autoregressive structure, it does not present any parameters that express the variables relationship at the same point in space, but only at lagged points. Also, its model parameters (in the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Dynamic regression; Soil properties; Spatial heterogeneity; Kalman filter. |
| Ano: 2003 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000200023 |
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| AHRENS,D.C.; VILLELA,F.A.. |
| Dois modelos de secadores comerciais, um intermitente lento, com a temperatura do ar de secagem a 60oC e a 65oC e outro rápido a 50oC, foram testados para a avaliação da redução do grau de umidade de 20 para 13% e sua influência na qualidade fisiológica das sementes de tremoço azul (Lupinus angustifolius L.). Foram realizados testes de germinação, envelhecimento artificial e emergência em campo, após a secagem, aos três e seis meses de armazenamento. Os testes de germinação e envelhecimento artificial não detectaram diferenças significativas entre a qualidade das sementes secadas nos secadores e das secadas à sombra. Na semeadura aos seis meses, as emergências em campo foram 81%, 89%, 90% e 83% para os secadores intermitente lento a 60oC, a 65oC, para o... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Secagem; Qualidade; Tremoço azul; Lupinus angustifolius L.; Sementes. |
| Ano: 1996 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161996000200020 |
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| Demattê,J.A.M.; Aloisi,R.R.; Demattê,J.L.I.. |
| Estudou-se uma seqüência de Latossolo Amarelo-Podzólico Amarelo-Areia Quartzosa desenvolvida em sedimentos da Formação Barreiras. A área se localiza no sul do Pará, nas proximidades entre Tucuruí e o Rio Moju, distando 65km da Usina Hidroelétrica de Tucuruí. Foi escolhida uma encosta de aproximadamente 1500 metros formada por Latossolo na parte alta e Podzólico Amarelo na encosta, ambos argilosos, terminando em amplo vale de fundo arenoso, com forte hidromorfísmo. Os regimes de temperatura são isohipertérmico e hipertérmico e os de umidade ústico e áquico, nas partes elevadas e fundo do vale, respectivamente. Foram abertas quatro trincheiras ao longo da encosta e feitas oito tradagens para apoio. O material de origem é representado pela caolinita.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Seqüência de solos; Latossolos Amarelos; Formação Barreiras; Região de Tucuruí. |
| Ano: 1994 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161994000200022 |
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| Gomes,Regina Lucia Ferreira; Costa,Marcones Ferreira; Alves-Pereira,Alessandro; Bajay,Miklos Maximiliano; Viana,João Paulo Gomes; Valente,Sérgio Emílio dos Santos; Lopes,Ângela Celis de Almeida; Zucchi,Maria Imaculada; Pinheiro,José Baldin. |
| ABSTRACT Some germplasm collections have a high number of accessions, which makes it difficult to explore the genetic variability present in the germplasm bank due to the redundancy and the difficulty of detailed analysis of all conserved accessions. Therefore, our study aimed to analyze the genetic diversity of 153 lima bean (Phaseolus lunatus) accessions for the purpose of constructing a core collection. Eleven SSRs were used for this purpose. The 153 lima bean accessions can be represented by low redundancy using a minimum of 34 accessions, thus representing 22 % of the size of the entire germplasm bank. The core collection had a higher Shannon diversity index and expected heterozygosity (1.906 and 0.811, respectively) than those presented by the entire... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Germplasm; Genetic diversity; Genetic structure; Microsatellite markers. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162020000201100 |
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| Registros recuperados: 2.661 | |
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