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| Carvalho,Daniel F. de; Gomes,Daniela P.; Oliveira Neto,Dionizio H. de; Guerra,José G. M.; Rouws,Janaína R. C.; Oliveira,Fábio L. de. |
| ABSTRACT This study was carried out to evaluate the contributions to the optimization of water use in a carrot crop under different forms of mulch using Gliricidia sepium, fertilization with castor bean cakes and irrigation water depths. The experiment was conducted in Seropédica, RJ, Brazil (22º 46’ S and 43º 41’ W), from June to September 2010. The experiment was conducted using a split-split-plot scheme (5 x 3 x 2), with four replicates. The five plots had irrigation depths corresponding to 0, 43, 72, 100 and 120% of crop evapotranspiration (ETc); the three subplots contained the different forms of mulch (whole leaves (WL) and chopped leaves and branches (CLB)) and the absence of mulch (AM); and the two sub-subplots contained either the presence (PF) or... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Irrigation management; Gliricidia sepium; Castor bean cake; Daucus carota L.; Organic agriculture. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662018000700445 |
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| Carvalho,Daniel F. de; Silva,Dione G. da; Souza,Adilson P. de; Gomes,Daniela P.; Rocha,Hermes S. da. |
| A evapotranspiração de referência (ETo) é dependente da quantidade de energia disponível no ambiente e a radiação solar (Rs) é uma variável importante na sua estimativa. Mediante o exposto, o presente trabalho teve como objetivo determinar os coeficientes "a" e "b" da equação de Angströn-Prescott para Seropédica, RJ, e avaliar seus efeitos na estimativa da Rs e da ETo. Utilizaram-se medidas da radiação solar global e número efetivo de horas de brilho solar da estação Ecologia Agrícola (83741 -INMET) do período de 2000 a 2007. Os coeficientes foram determinados por análise de regressão linear, para todo o período e para períodos mensais e anuais. Utilizando-se os coeficientes calculados e os propostos pela FAO (0,25 e 0,50) estimaram-se Rs e ETo, e se... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Radiação solar; Brilho solar; Estação meteorológica; Penman-Monteith. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662011000800011 |
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| Oliveira,Marcelo S. de; Carvalho,Daniel F. de; Gomes,Daniela P.; Pereira,Fernandes A. C.; Medici,Leonardo O.. |
| ABSTRACT This study aimed to evaluate the production of cut sunflower in response to different water volumes and substrates, composed of soil and coconut fiber. Two simultaneous experiments were conducted in greenhouse, located in the Horticulture Sector of the Federal Rural University of Rio de Janeiro (UFRRJ), Seropédica - RJ, Brazil (22º 48’ S, 43º 41’ W and altitude of 33 m), between April and June 2016. Water was applied by an Simplified Irrigation Controller (SIC), allowing the application of different volumes (33, 67 and 133% of retention capacity of substrate) in comparison to the control treatment (100%). The substrates used were 1/3 of coconut fiber and 2/3 of soil (v/v) (Experiment 1), and 2/3 of coconut fiber and 1/3 of soil (Experiment 2). The... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Helianthus annuus L.; Irrigation water management; Ornamental plant. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662018001200859 |
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| Carvalho,Daniel F. de; Ribeiro,Eduardo C.; Gomes,Daniela P.. |
| ABSTRACT The objectives of this study were to obtain the onion crop coefficients and evaluate the influence of different irrigation depths (0, 22, 45, 75 and 100% of crop evapotranspiration) on marketable yield and quality of onion bulbs cultivated with and without mulch of elephant grass. The experiment was carried out in Seropédica, RJ, Brazil, from May to September 2012, in a Red Yellow Argisol. The experimental design was in randomized blocks in split plots, with 10 treatments and seven replicates. Irrigation management was performed through soil water balance using the Time Domain Reflectometry technique, with probes installed horizontally at 7.5 and 22.5 cm depths. The use of mulch allowed the application of smaller irrigation depths, leading to... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Crop coefficient; Water requirement; Allium cepa L.; Vegetable grass residues. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662018000200107 |
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