Fabrício Silva Coelho
Universidade Federal de Viçosa
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Revista Ciencia Agronomica | 2011
Marcelo Cleón de Castro Silva; Fabrício Silva Coelho; Heder Braun; Paulo Cezar Rezende Fontes
Objetivou-se avaliar a influencia do nitrogenio (N) sobre a leitura do indice SPAD, verificar se as leituras SPAD na quarta folha sao sensiveis a variacoes com a posicao e o horario de avaliacao bem como o efeito da irrigacao sob as leituras SPAD na cultura da batata. O experimento foi conduzido de junho a setembro de 2008, no delineamento experimental de blocos casualizados, com quatro repeticoes. Os tratamentos constaram de cinco doses de N (0; 50; 100; 200 e 300 kg ha-1) aplicadas no sulco em pre-plantio, na forma de sulfato de amonio. As leituras do indice SPAD foram realizadas na quarta folha (QF) a partir do apice e na folha mais velha (FV) aos 7; 14; 21; 28; 35; 42; 49 e 56 dias apos a emergencia (DAE). Aos 21 DAE realizou-se a leitura do indice SPAD em diferentes horarios, posicoes no foliolo terminal da QF e determinou-se o indice SPAD antes e apos a irrigacao. As doses de N e os DAE influenciaram a leitura do indice SPAD na QF e FV durante o ciclo da cultura. Houve efeito das doses de N sobre o indice SPAD em todas as regioes do foliolo terminal da QF, exceto para a regiao distal. As doses de N e os diferentes horarios de avaliacao durante o dia influenciaram a leitura do indice SPAD na QF. Houve diferenca entre os valores do indice SPAD antes e apos a irrigacao. Assim, deve ser estabelecido um rigoroso protocolo para a determinacao do indice SPAD.
Revista Ciencia Agronomica | 2013
Fabrício Silva Coelho; Paulo Cezar Rezende Fontes; Paulo Roberto Cecon; Heder Braun; Ivo Ribeiro da Silva
Regardless of the nitrogen (N) content used, the existence of values, accepted as a critical concentration, is necessary for use as a reference standard. The objective was to establish critical levels of the SPAD index, Hue angle, concentration of total N, and fourth-leaf dry matter of the potato plant, by two methods, and to use such critical levels for the prediction of the N-status of the plant, based on the relative yield. The experiments were conducted on crops from the winter and rainy seasons. The treatments consisted of five dosages of N, applied in the form of urea when planting (0, 50, 100, 200 and 300 kg ha-1 of N). The design was of randomized blocks with four replications. The potato cultivar used was Agata. At 21 days after emergence (DAE) the SPAD index, concentration of total N, Hue angle and dry weight of the fourth leaf from the apex of the plant (MSQF), were all determined. To calculate the critical level, the Cate-Nelson graphical procedure and a mathematical procedure were used. The prediction errors of the diagnosis of the N-status determined from the critical levels were estimated using the Cate-Nelson graphical method, by quantifying the percentage of observations which were located in negative quadrants. There was an apparent discrepancy in the critical-level values of N when using the two calculation procedures. The critical levels determined at 21 DAE are suitable for making relatively accurate assessments of N sufficiency at an early stage of evaluation.
Revista Brasileira De Ciencia Do Solo | 2010
Fabrício Silva Coelho; Paulo Cezar Rezende Fontes; Mário Puiatti; Júlio César Lima Neves; Marcelo Cleón de Castro Silva
Journal of Food Agriculture & Environment | 2010
Heder Braun; Paulo Cezar Rezende Fontes; Camilo Busato; Paulo Roberto Cecon; Fabrício Silva Coelho; M. C. de C. Silva
Australian Journal of Crop Science | 2016
Paulo Cezar Rezende Fontes; Heder Braun; Marcelo Cleón de Castro Silva; Fabrício Silva Coelho; Paulo Roberto Cecon; Fábio Luiz Partelli
Revista de Ciências Agrarias - Amazon Journal of Agricultural and Environmental Sciences | 2013
Heder Braun; Fabrício Silva Coelho; Marcelo Cleón de Castro Silva; Paulo Cezar Rezende Fontes; Paulo Roberto Cecon; Camilo Busato
Idesia (arica) | 2011
Marcelo Cleón de Castro Silva; André F. A. Medeiros; Denise Cunha Fernandes dos Santos Dias; Eveline Mantovani Alvarenga; Fabrício Silva Coelho; Heder Braun
Archive | 2013
Fabrício Silva Coelho; Paulo Cezar Rezende Fontes; Paulo Roberto Cecon; Heder Braun
Archive | 2012
Fabrício Silva Coelho; Paulo Cezar; Rezende Fontes; Heder Braun; Castro Silva
Revista Brasileira de Agropecuária Sustentável | 2011
Marcelo Cleón de Castro Silva; Heder Braun; Fabrício Silva Coelho
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Denise Cunha Fernandes dos Santos Dias
National Council for Scientific and Technological Development
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