Pesquisa Agropecuária Brasileira最新文献

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Nitrogen efficiency indexes for evaluating nitrogen uptake and use in ornamental bromeliad’s root system and tank 评价观赏凤梨根系和槽内氮素吸收和利用的氮效率指标

Pesquisa Agropecuária Brasileira Pub Date : 2018-06-01 DOI: 10.1590/s0100-204x2018000600006

K. G. D. Silva, M. L. Ferreira, Emerson A Silva, S. Kanashiro, P. Camargo, A. Tavares

{"title":"Nitrogen efficiency indexes for evaluating nitrogen uptake and use in ornamental bromeliad’s root system and tank","authors":"K. G. D. Silva, M. L. Ferreira, Emerson A Silva, S. Kanashiro, P. Camargo, A. Tavares","doi":"10.1590/s0100-204x2018000600006","DOIUrl":"https://doi.org/10.1590/s0100-204x2018000600006","url":null,"abstract":"Abstract: The objective of this work was to evaluate if nitrogen use efficiency (NUE) indexes can elucidate functional differences in nutrient uptake between the root system and tank of epiphytic bromeliads. The bromeliads Guzmania lingulata and Vriesea 'Harmony' received fertilizers in their tanks or through their roots using modified Hoagland & Arnon solution, with 0.00, 2.62, or 5.34 mmol L-1 nitrogen, as urea. After 90 days, nitrogen contents in leaves and plant biomass were evaluated, and NUE indexes were calculated. Guzmania lingulata and V. 'Harmony' fertilized in their tanks with 5.34 mmol L-1 had the highest averages of nitrogen uptake efficiency and recovery efficiency; those fertilized with 2.62 mmol L-1 through their roots showed the highest averages of NUE, nitrogen utilization efficiency, nitrogen physiological efficiency, and biomass conversion efficiency. The NUE indexes, besides being an effective tool to assess the nutritional status of ornamental bromeliads, reveal that the root system of epiphytic bromeliads is functional for nitrogen uptake and use.","PeriodicalId":185886,"journal":{"name":"Pesquisa Agropecuária Brasileira","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131908957","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 8

Soil roughness indexes and their relationship with water erosion 土壤粗糙度指数及其与水分侵蚀的关系

Pesquisa Agropecuária Brasileira Pub Date : 2018-06-01 DOI: 10.1590/s0100-204x2018000600012

Fernanda Zangiski, D. J. Miquelluti, I. Bertol, J. C. Ramos

{"title":"Soil roughness indexes and their relationship with water erosion","authors":"Fernanda Zangiski, D. J. Miquelluti, I. Bertol, J. C. Ramos","doi":"10.1590/s0100-204x2018000600012","DOIUrl":"https://doi.org/10.1590/s0100-204x2018000600012","url":null,"abstract":"Abstract: The objective of this work was to express soil roughness through statistical, geostatistical, and fractal indexes, comparing and relating them to soil and water losses in different experimental conditions. The study was conducted from 2012 to 2015, in the municipality of Lages, in the state of Santa Catarina, Brazil, in a completely randomized design with two replicates. Three treatments were evaluated: T1, scarified soil at the end of the ryegrass (Lolium multiflorum) crop cycle after removal of the shoot residue; T2, scarified soil at the end of the vetch (Vicia sativa) crop cycle after removal of the shoot residue; and T3, scarified soil without cultivation and without cover. The heights of the microrelief were read with a surface roughness tester with rods. Soil roughness was analyzed through the statistical, geostatistical, and fractal indexes. The fractal dimension and intersection distance showed a clear difference between the treatments with cultivation. All indexes, except R1, are associated with soil losses in the treatments with cultivation. As for water losses, there is only an association with the fractal dimension index and only in the treatment without cultivation.","PeriodicalId":185886,"journal":{"name":"Pesquisa Agropecuária Brasileira","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116981140","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

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