Produtividade do capim tanzânia em diferentes níveis e freqüências de irrigação
Arquivos
Data
2008-01
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Editor
Acta Scientiarum. Agronomy
Resumo
Objetivou-se estudar o efeito de diferentes freqüências e níveis de irrigação sobre a produtividade de massa seca (MS) do Panicum maximum Jacq. cv. Tanzânia. Uma bancada experimental foi montada em ambiente protegido, onde foram colocados recipientes cultivados com o capim tanzânia. As irrigações foram realizadas com freqüências de um, quatro e sete dias, e lâminas de irrigação para restabelecer 50, 75 e 100% da disponibilidade total de água no solo. A evapotranspiração da cultura foi obtida por meio de quatro lisímetros de drenagem. A produtividade de MS foi obtida por meio do material pré-seco, em estufa ventilada, a 65ºC, por 72 horas, e seco definitivamente em estufa a 105ºC, por 24 horas. A menor produtividade de MS (73,1 g recipiente-1) foi encontrada no tratamento de nível de irrigação de 50% e freqüência de sete dias. A maior produtividade de MS (129,5 g recipiente-1) foi encontrada no tratamento de nível de irrigação de 100% e freqüência de um dia. Conclui-se que a produtividade de MS aumentou à medida que aumentou o nível de irrigação e diminuiu a freqüência de irrigação.
The aim of this work was to study the effect of different irrigation frequencies and levels on dry matter (DM) yield of Panicum maximum Jacq. cv. Tanzania. The experiment was carried out under greenhouse conditions, where drums were filled out with soil and cultivated with tanzania grass. The irrigations were performed with a frequency of 1, 4 and 7 days, in order to re-establish soil water content to 50, 75 and 100% of the total available water in the soil. The crop evapotranspiration (ETc) was obtained by means of four drainage lysimeters. The yield of DM was obtained by means of the material pre-dried in ventilated stoves at 65ºC, for 72 h, and dried definitively in stoves at 105ºC, for 24 h. The smallest DM yield (73.1 g vessel-1) was obtained for total available water in the soil of 50% and 7-day irrigation frequency. The highest DM yield (129.5 g vessel-1) was obtained for total available water of 100% and 1-day irrigation frequency. The authors concluded that the DM yield increases with the increasing of percentage of total available water and decreasing of irrigation frequency.
The aim of this work was to study the effect of different irrigation frequencies and levels on dry matter (DM) yield of Panicum maximum Jacq. cv. Tanzania. The experiment was carried out under greenhouse conditions, where drums were filled out with soil and cultivated with tanzania grass. The irrigations were performed with a frequency of 1, 4 and 7 days, in order to re-establish soil water content to 50, 75 and 100% of the total available water in the soil. The crop evapotranspiration (ETc) was obtained by means of four drainage lysimeters. The yield of DM was obtained by means of the material pre-dried in ventilated stoves at 65ºC, for 72 h, and dried definitively in stoves at 105ºC, for 24 h. The smallest DM yield (73.1 g vessel-1) was obtained for total available water in the soil of 50% and 7-day irrigation frequency. The highest DM yield (129.5 g vessel-1) was obtained for total available water of 100% and 1-day irrigation frequency. The authors concluded that the DM yield increases with the increasing of percentage of total available water and decreasing of irrigation frequency.
Descrição
Palavras-chave
Irrigação, Consumo de água, Panicum maximum, Massa seca