Publicação
Influence of soil management (natural vegetation and tillage) on physiological parameters in Oleae europaea Cv. Cobrançosa
| Resumo: | Olive trees (Olea europaea) have great social and economic interest in Trás-os-Montes. In this region, conventional tillage has long been used for control of weeds, with a frequency of three to four times a year. The aim of this work was to study the effect of soil cover with natural vegetation (nv) in comparison to the traditional tillage (tt) on photosynthetic parameters and leaves mass in the Cobrançosa cultivar. The work was carried out in 2003 in a no-irrigated olive orchard located in Paradela – Mirandela (Northeast of Portugal). The orchard has about 4.o ha of surface, and two plots with different management were constituted, one aws tilled every time that was necessary to control the weeds and in the other the natural vegetation grew freely over the last one year. In each plot, five randomly trees were sampled and Dry weight (Dw), chlorophyll contents (Chla, Chlb, Total Chl), carotenoides and gas exchanges (E – transpiration, A – photosynthesis and gs – stomatal conductance) were determined in July and September. No significant differences were found in Dw between plots in July (tt – 48.78% and nv – 48.97%) and September (tt- 51.60% and nv – 52.71%). In July, the chla, chlb and Total chl contents were significantly greater in the olive trees under nv treatment (p=0.025, p=0.0125 and p=0.018, respectively). In September similar results were found, however, they didn’t differ statistically between treatments. The carotenoids contents were higher in nv than tt (tt – 2.6 mg/g Wf and nv - 2.8 mg/g Wf, in July, and tt – 3.31 mg/g Wf and nv – 3.77 mg/g Wf, in September), but only differs significantly in September (p=0.012). Photosynthesis parameters (gs, E and A) were significantly higher in olive trees under nv. In September E was 0.773 mol H2Om-2s-1 and 1.136 mol H2Om-2s-1; A was 3.60 umol CO2 m-2s-1 and 5.28 umol CO2 m-2s-1; gs was 0.013 mol m-2s-1 and 0.027 mol m-2s-1 respectively in tt and nv. |
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| Autores principais: | Baptista, Paula |
| Outros Autores: | Pereira, J.A. |
| Assunto: | Olea europaea Tillage Photosynthetic parameters Chlorophyll contents |
| Ano: | 2004 |
| País: | Portugal |
| Tipo de documento: | documento de conferência |
| Tipo de acesso: | acesso aberto |
| Instituição associada: | Instituto Politécnico de Bragança |
| Idioma: | inglês |
| Origem: | Biblioteca Digital do IPB |
| Resumo: | Olive trees (Olea europaea) have great social and economic interest in Trás-os-Montes. In this region, conventional tillage has long been used for control of weeds, with a frequency of three to four times a year. The aim of this work was to study the effect of soil cover with natural vegetation (nv) in comparison to the traditional tillage (tt) on photosynthetic parameters and leaves mass in the Cobrançosa cultivar. The work was carried out in 2003 in a no-irrigated olive orchard located in Paradela – Mirandela (Northeast of Portugal). The orchard has about 4.o ha of surface, and two plots with different management were constituted, one aws tilled every time that was necessary to control the weeds and in the other the natural vegetation grew freely over the last one year. In each plot, five randomly trees were sampled and Dry weight (Dw), chlorophyll contents (Chla, Chlb, Total Chl), carotenoides and gas exchanges (E – transpiration, A – photosynthesis and gs – stomatal conductance) were determined in July and September. No significant differences were found in Dw between plots in July (tt – 48.78% and nv – 48.97%) and September (tt- 51.60% and nv – 52.71%). In July, the chla, chlb and Total chl contents were significantly greater in the olive trees under nv treatment (p=0.025, p=0.0125 and p=0.018, respectively). In September similar results were found, however, they didn’t differ statistically between treatments. The carotenoids contents were higher in nv than tt (tt – 2.6 mg/g Wf and nv - 2.8 mg/g Wf, in July, and tt – 3.31 mg/g Wf and nv – 3.77 mg/g Wf, in September), but only differs significantly in September (p=0.012). Photosynthesis parameters (gs, E and A) were significantly higher in olive trees under nv. In September E was 0.773 mol H2Om-2s-1 and 1.136 mol H2Om-2s-1; A was 3.60 umol CO2 m-2s-1 and 5.28 umol CO2 m-2s-1; gs was 0.013 mol m-2s-1 and 0.027 mol m-2s-1 respectively in tt and nv. |
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