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ESPINDULA, M. C.; RODOVALHO, G. M.; MARCOLAN, A. L.; BARBERENA, I. M.; CIPRIANI, H. N.; ARAÚJO, L. F. B. de. |
This study presents an evaluation of the viability of using protected urea under different irrigation depths to reduce nitrogen losses caused by the volatilization of ammonia (NH3) under the conditions of the Southwestern Amazon. The study was carried out at the Experimental Station of Embrapa Rondônia, in the municipality of Porto Velho, Rondônia State, Brazil. The experiment was conducted in a Red-Yellow Latosol and arranged in a 5 x 6 factorial design consisting of a combination of five treatments (N sources) with six irrigation depths. The sources of N were as follows: 1) urea (45.5% N); 2) urea (44.3% N) + 0.15% copper and 0.4% boron; 3) urea (45% N) + NBPT; 4) urea (43% N) + sulfur (1%); and 5) control (without N). The irrigation depths were 0, 5,... |
Tipo: Artigo em periódico indexado (ALICE) |
Palavras-chave: Latossolo Vermelho-Amarelo; Red-Yellow Latosol; Uréia protegida; Protected urea; Volatilização; Irrigation depths; Embrapa Rondônia; Porto Velho (RO); Rondônia; Amazônia Ocidental; South Western Amazon; Nitrogênio; Perda; Amônia; Uréia; Irrigação; Campo Experimental; Ammonium nitrogen; Urease inhibitors; Volatilization; Demonstration farms. |
Ano: 2021 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1128979 |
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RUDNICK, V. A. de S.; VIEIRA JÚNIOR, J. R.; FERNANDES, C. de F.; ROCHA, R. B.; TEIXEIRA, A. L.; RAMALHO, A. R.; ESPINDULA, M. C.; SANTOS, A. V.; ANJOS, E. F. M. dos; UCHÔA, F. P.. |
Root-knot disease is among the main diseases affecting coffee crop. The plant selection to the development new resistant cultivars is among one the most efficient methods of control. The present work aimed to quantify the resistance responses of Coffea canephora clones to root-knot nematode Meloidogyne incognita in the Western Amazon. For this, 17 previously selected clones were evaluated in three experimental trials, carried out in the municipalities of Ji-Paraná and Porto Velho, Rondônia. The resistance to root-knot nematodes M. incognita were evaluated by the numbers of gall in the roots (NG) and by the reproductive factor (RF). The resistance response was also interpreted according the genetic diversity of the clones based in their morphological... |
Tipo: Artigo em periódico indexado (ALICE) |
Palavras-chave: Nó da raiz; Ji-Paraná (RO); Porto Velho (RO); Rondônia; Amazônia Ocidental; Western Amazon; Melhoramento Genético Vegetal; Doença de Planta; Café; Coffea Canephora; Nematóide; Meloidogyne Incognita; Comportamento de Variedade; Resistência Genética; Plant breeding; Root diseases; Root-knot nematodes; Variety trials; Disease resistance. |
Ano: 2020 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1124813 |
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SANTOS, E. S. N. dos; CAMPOS, M. C. C.; SOUZA, F. G. de; CUNHA, J. M.; PINHEIRO, E. N.; LIMA, A. F. L. de; BRITO, W. B. M.; WADT, P. G. S.. |
Studies related to the monitoring of soil quality by physical attributes are important for the evaluation and maintenance of the sustainability of agricultural systems, besides indicating the appropriate management of the environment, aiming at its conservation and productivity. The objective of this study was to evaluate the stability of aggregates and organic carbon after the application of gypsum, soil scarification and a succession of crops. The treatments consisted of an absence and addition of gypsum, absence and presence of soil scarification, and three systems of crops in succession. The experimental design was made of randomized blocks, in a 2x2x4 factorial scheme, with eight replications. The aggregates were evaluated as stabled in water and soil... |
Tipo: Artigo em periódico indexado (ALICE) |
Palavras-chave: Carbono orgânico; Sucessão de culturas; Succession of crops; Embrapa Rondônia; Porto Velho (RO); Amazônia Ocidental; Western Amazon; Manejo do Solo; Deterioração do Solo; Propriedade Físico-Química; Gesso; Escarificação de sementes; Campo Experimental; Soil management; Physicochemical properties; Soil degradation; Seed scarification; Gypsum; Soil organic carbon; Demonstration farms. |
Ano: 2020 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1128331 |
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