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| Registros recuperados: 11 | |
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| Nascimento,Fábio Nunes do; Andrade Júnior,Aderson Soares de; Bastos,Edson Alves; Ribeiro,Valdenir Queiroz; Lopes,Alzeneide da Silva. |
| Abstract: The objective of this work was to evaluate the stalk yield, technological quality parameters, and sugar and alcohol productions in the first sugarcane (Saccharum officinarum) crop cycle, according to the response to N and K2O applications by subsurface drip fertigation. The experiment was carried out in a dystrophic Ultisol, in a randomized complete block design with four replicates. The treatments consisted of a 2X + 2X + 1 incomplete factorial arrangement with the application of 60, 80, 120, 160, and 180 kg ha-1 N and 60, 80, 120, 160, and 180 kg ha-1 K2O. The maximum estimated yield (217.5 Mg ha-1) was obtained with the application of 180 kg ha-1 N and 60 kg ha-1 K2O. Sugar and alcohol productions increased with N application above 120 kg... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Saccharum officinarum; Alcohol production; Fertilizer; Irrigation management; Sugarcane juice. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2018001201346 |
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| Cardoso,Milton José; Bastos,Edson Alves; Athayde Sobrinho,Cândido; Melo,Francisco de Brito. |
| ABSTRACT Cowpea beans play an important role in Brazilian farming, mainly in northern and northeastern regions, where it is widely grown among smallholder farmers. In recent years, commercial farmers have expanded its cultivation, mostly to the Midwest. This study aimed at evaluating the planting density of 'BRS Itaim' black-eyed cowpea beans under conventional (CT) and no-tillage (NT), with 75% mulch in the first year. Two experiments (CT and NT) were conducted at Embrapa Meio-Norte in Teresina - PI (Brazil), during the 2014/2015 harvest. Both experiments were carried out in a randomized block design with four replicates, considering the planting densities (PD) 12, 16, 20, 24, and 28 plants m-2. In both systems, grain yields (GY) and the number of pods... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Yield components; Yield grain; Vigna unguiculata (L.) Walp. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902017000500856 |
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| Costa Junior,Manoel de Jesus Nunes da; Bastos,Edson Alves; Cardoso,Milton José; Andrade Júnior,Aderson Soares de. |
| ABSTRACT The cowpea is of great socioeconomic importance in the North, Northeast and Mid-West of Brazil, and its irrigated farming has recently been on the increase in these regions. The aim of this study was to evaluate the agronomic performance of the cowpea 'BRS Tumucumaque' for different row spacings and irrigation depths, under the conditions of soil and climate of Teresina, in the State of Piauí. The experiment was carried out from August to November 2014, in a Yellow Argisol at the Experimental Area of Embrapa Meio-Norte in Teresina. The experimental design was of randomised blocks in subdivided lots, with four replications. The treatments consisted of five irrigation depths (40% ETo, 70% ETo, 100% ETo, 130% ETo and 160% ETo) in the main plot, and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Vigna unguiculata; Grain yield; Irrigation management; Plant density; BRS Tumucumaque. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902017000500774 |
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| Melo,Francisco de Brito; Souza,Henrique Antunes de; Bastos,Edson Alves; Cardoso,Milton Jose. |
| ABSTRACT Proposing sufficiency ranges and critical levels is an important technique for correct evaluation of leaf nutrient diagnosis. In this study, the objective was to propose critical levels and sufficiency ranges of macro- and micronutrients for the diagnostic leaf of cowpea, collected at flowering, with the results of macro- and micronutrients and productivity in the Northeast of Brazil. The critical level was calculated by the reduced normal distribution and by the boundary line method, which was also used to generate sufficiency ranges. For the critical level by reduced normal distribution, the relationship of the nutrients with 90% of maximum productivity was adopted. For the boundary line, the relationship of the nutrients that are in the upper... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Vigna unguiculata; Leaf content; Plant nutrition. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902020000400407 |
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| Ramos,Herbert Moraes Moreira; Bastos,Edson Alves; Andrade Júnior,Aderson Soares de; Marouelli,Waldir Aparecido. |
| O objetivo deste trabalho foi determinar estratégias ótimas de irrigação do feijão‑caupi (Vigna unguiculata) para a produção de grãos verdes, com a água como fator limitante da produção e diferentes valores de preço do produto. O experimento foi conduzido na Embrapa Meio‑Norte, em Teresina, PI, entre setembro e novembro de 2009. Foram avaliadas cinco lâminas de irrigação, estabelecidas com base em frações da evapotranspiração de referência (25, 50, 75, 100 e 125% da ETo), e as cultivares BRS Guariba e BRS Paraguaçu de feijão‑caupi. Aplicou-se a irrigação por sistema de aspersão convencional fixo. Utilizou-se o delineamento experimental de blocos ao acaso, com quatro repetições e parcelas subdivididas (cultivares). As lâminas de irrigação entre 290 e 325 mm... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Vigna unguiculata; Evapotranspiração; Irrigação com deficit; Planejamento de irrigação. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2012000400014 |
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| Andrade Júnior,Aderson Soares de; Frizzone,José Antonio; Bastos,Edson Alves; Cardoso,Milton José; Rodrigues,Braz Henrique Nunes. |
| O trabalho teve como objetivo determinar estratégias ótimas de irrigação para a cultura da melancia (Citrullus lanatus Thumb. Mansf.), considerando a água como fator limitante da produção e diferentes valores para o preço do produto e custos da energia elétrica. Utilizou-se uma função de produção quadrática e função de custo linear obtidas para as condições edafoclimáticas dos Tabuleiros Costeiros do Piauí. A irrigação com déficit proporcionou as maiores rendas líquidas, com significativa economia de água, no intervalo de variação de preços do produto de US$ 0,05 kg-1 a US$ 0,35 kg-1, nas três formas de tarifação da energia elétrica. Acima desse intervalo, deve-se utilizar a lâmina que maximiza a produção de frutos. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Citrullus lanatus; Níveis de irrigação; Consumo hídrico. |
| Ano: 2001 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2001000200013 |
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| Bastos,Edson Alves; Nascimento,Sebastião Pereira do; Silva,Everaldo Moreira da; Freire Filho,Francisco Rodrigues; Gomide,Reinaldo Lúcio. |
| The genotypes selection for drought tolerance is very important for world food production, principally in arid regions or sites with irregular rain distribution. The objective of this work was to identify cowpea genotypes with drought tolerance and water stress sensitivity characteristics. Two experiments were carried out with 20 treatments and four replications, one under water deficit during reproductive phase and another one under full irrigation. The water deficit was obtained applying half the water depth required by cowpea. The leaf area index, chlorophyll content, grain components and grain yield were evaluated. The water deficit reduced 20% the leaf area index, 16% the chlorophyll content, 175% the pod number per plant and 60% the grain yield. The... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Vigna unguiculata; Leaf area index; Chlorophyll content. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902011000100013 |
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| Andrade Júnior,Aderson Soares de; Bastos,Edson Alves; Ribeiro,Valdenir Queiroz; Duarte,José Adilberto Lemos; Braga,Darlan Leão; Noleto,Donavan Holanda. |
| O objetivo deste trabalho foi definir os níveis ótimos de irrigação, nitrogênio e potássio em cana-de-açúcar, cultivar RB867515, aplicados por gotejamento subsuperficial, em ciclo de primeira soca, para máxima produção de colmos, açúcar e álcool. O experimento foi realizado em Plintossolo do Município de União, no Estado do Piauí, durante o ano agrícola 2008/2009. Os tratamentos consistiram de: níveis de irrigação mais precipitação (W1, 767,5; W2, 898,5; W3, 971,0; W4, 1.053,0; e W5, 1.154,0 mm) e níveis de adubação nitrogenada e potássica (N1, 44,0; N2, 78,0; N3, 111,0; N4, 144,0; N5, 178,0; K1, 44,0; K2, 67,0; K3, 89,0; K4, 111,0; e K5, 133,0 kg ha-1). Utilizou-se o delineamento experimental de blocos ao acaso, com duas repetições, em arranjo fatorial... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Saccharum officinarum; Agroenergia; Irrigação. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2012000100011 |
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| Rodrigues,Erina Vitório; Damasceno-Silva,Kaesel Jackson; Rocha,Maurisrael de Moura; Bastos,Edson Alves; Teodoro,Paulo Eduardo. |
| ABSTRACT The objective of this work was to use different selection criteria to identify cowpea genotypes tolerant to water deficit to be used in recurrent selection programs aiming to reduce the cowpea crop cycle and improve its productive components. Six cowpea genotypes were crossed in a complete diallel scheme. The experiment was conducted in an incomplete block experimental design in a triple lattice arrangement, with the 30 F2 populations of cowpea. The genetic variability of 10 traits was verified, and the following selection criteria were used: direct and indirect selection, classical index, index based on desired gains, and index based on sum of ranks. The number of days to flowering (NDF), number of days to maturity (NDMD), pod weight (PW), grain... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Direct and indirect selection; Interpopulation recurrent selection; Vigna unguiculata L. Walp. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902017000500889 |
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| Bastos,Edson Alves; Folegatti,Marcos Vinícius; Faria,Rogério Teixeira de; Andrade Júnior,Aderson Soares de; Cardoso,Milton José. |
| The objective of this work was to adapt the CROPGRO model, which is part of the DSSAT system, for simulating the cowpea (Vigna unguiculata) growth and development under soil and climate conditions of the Baixo Parnaíba region, Piauí State, Brazil. In the CROPGRO, only input parameters that define crop species, cultivars, and ecotype were changed in order to characterize the cowpea crop. Soil and climate files were created for the considered site. Field experiments without water deficit were used to calibrate the model. In these experiments, dry matter (DM), leaf area index (LAI), yield components and grain yield of cowpea (cv. BR 14 Mulato) were evaluated. The results showed good fit for DM and LAI estimates. The medium values of R² and medium absolute... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Vigna unguiculata; Models; Climatic factors; Edaphic factor; Water availability; DSSAT. |
| Ano: 2002 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2002001000005 |
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| Anjos,João Carlos Rocha dos; Andrade Júnior,Aderson Soares de; Bastos,Edson Alves; Noleto,Donavan Holanda; Melo,Francisco de Brito; Brito,Raimundo Rodrigues de. |
| Abstract: The objective of this work was to evaluate water storage in a Plinthaqualf under different straw levels during the fourth ratoon season of a sugarcane (Saccharum officinarum) crop. The study was conducted in the 2013/2014 crop season, with the cultivar SP-813250, at two soil depths (0.0-0.3 and 0.3-0.6 m), in a randomized complete block design, with five straw levels (0.0, 4.2, 9.5, 13.0, and 18.4 Mg ha-1) and four replicates. Soil moisture content was monitored with a time-domain reflectometer. The straw provided gains of up to 20 Mg ha-1 stems and kept increased water storage in the soil, in comparison with the soil without straw, in all evaluated periods. Maintenance of up to 50% (9.5 Mg ha-1) of sugarcane straw on soil surface promotes better... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Saccharum officinarum; No-tillage; Soil mulch; Water balance. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2017000600464 |
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| Registros recuperados: 11 | |
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