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| Bassoi,Luís H.; Correia,Joselina de S.; Santos,Ana R. L. dos; Silva,Juliano A.; Costa,Bruno R. S.. |
| Irrigation plays an important role for grape’s yield as well as on its quality for winemaking. Thus, the effects of deficit irrigation strategies on yield and quality of wine grapes cv. Syrah were evaluated in Petrolina, State of Pernambuco, Brazil. Evaluations were carried out throughout the second and third growing seasons, which were from November 2010 to February 2011 (rainy season) and from May to September 2011 (dry season), respectively. Vines were drip irrigated and the experimental design was completely randomized with three treatments and four replications. The treatments were full irrigation (FI), performed according crop evapotranspiration; regulated deficit irrigation (RDI), in which irrigation was interrupted in phenological growth stage of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Vitis vinifera L.; Soil water content; Leaf water potential. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162015000300430 |
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| Martins,Amanda Posselt; Costa,Sérgio Ely Valadão Gigante de Andrade; Anghinoni,Ibanor; Kunrath,Taise Robinson; Cecagno,Diego; Reichert,José Miguel; Balerini,Fabrício; Dillenburg,Lúcia Rebello; Carvalho,Paulo César de Faccio. |
| Abstract: The objective of this work was to evaluate the impact of grazing intensities after 11 years of an integrated crop-livestock system, under no-tillage, on soil moisture and soybean physiological parameters during a summer season affected by drought. The experiment was established in 2001 on a Rhodic Hapludox. Treatments consisted in the succession of soybean (summer) and a mixed pasture of black oat + Italian ryegrass (winter), under different beef-cattle grazing intensities: intensive grazing, with 0.10-m pasture height; moderate grazing, with 0.20-m pasture height; and no grazing. During the soybean cycle, in the 2011/2012 crop season, rainfall was 40% of the climatological normal. The soil moisture was within the limits of available water both... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Glycine max; Leaf temperature; Leaf water potential; Water availability. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2016000800978 |
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| Alvarenga,Ivan Caldeira Almeida; Valadares,Rafael Vasconcelos; Martins,Ernane Ronie; Oliveira,Flávio Gonçalves; Figueiredo,Lourdes Silva de; Kobayashi,Mauro Koji. |
| The objective of this work was to assess the effect of different periods of water stress before harvest of pepper-rosmarin (Lippia sidoides) on the contents of essential oil and flavonoids. The experiment was carried out during 270 days of cultivation, with drainage lysimeters, in a completely randomized block design with five treatments: 0, 2, 4, 6, and 8 days of water suppression before harvest, with four replicates. Fresh and dry matter yield, essential oil content, total flavonoids content, and water potential and temperature of leaves were determined. There was a decrease of approximately 50% in oil content and of 60% in total flavonoid content with the reduction of leaf water potential in 0.3 MPa. Essential oil is more sensitive to water stress than... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Lippia sidoides; Essential oil; Flavonoids; Leaf water potential; Medicinal plant; Water stress. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2011000700005 |
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| Neves,Jose M. G.; Aquino,Leonardo A. de; Berger,Paulo G.; Neves,Júlio C. L.; Rocha,Genelício C.; Barbosa,Edimilson A.. |
| ABSTRACT The objective of this study was to evaluate the effect of Ca and Mg silicate and B on the gas exchange, leaf water potential and chlorophyll fluorescence parameters in the sunflower variety Embrapa 122 -V2000 under water stress conditions. The trial was conducted in Red Yellow Latosol with very clayey texture, with contrasting levels of Si and B and subjected to water deficit. The experimental design was randomized blocks in a 24 factorial arrangement, with five replicates. Treatments consisted of the combination of two acidity corrective agents (calcium magnesium silicate and dolomitic limestone), two levels of base saturation (30 and 70%), two levels of B (0.18 mg dm-3 - value available in the soil and 1.20 mg dm-3) and two water regimes (with... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Helianthus annuus; Chlorophyll fluorescence; Gas exchange; Leaf water potential. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662019000300175 |
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| Fabbri,Liliana Teresa; Ploschuk,Edmundo Leonardo; López,María Virginia; Insausti,Pedro; Rua,Gabriel Hugo. |
| Morphological and physiological responses to freezing were evaluated in two ecotypes of the perennial turfgrass Paspalum vaginatum. Leaf extension rate, number of active meristems, leaf water potential and net photosynthesis were measured on plants of both a commercial cultivar, 'Sea Isle 2000', and a wild ecotype from the Flooding Pampa grasslands of Argentina. Plants were propagated by cloning, cultivated in pots, and examined during 18 consecutive days under two treatments: a non-frozen control treatment (15.5±7 ºC) and a frozen treatment with two stages: Stage 1 with four hours of freezing stress for 10 nights (-5ºC), and Stage 2 with 12 hours of freezing stress for eight nights (five nights at -5ºC and three nights at -8ºC). After these treatments,... |
| Tipo: Info:eu-repo/semantics/other |
Palavras-chave: Freezing tolerance; Leaf water potential; Meristem injury; Paspalum vaginatum; Photosynthesis; Seashore paspalum; Turfgrass. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062016000100152 |
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| Almeida,Gabriel Martins; Silva,Adinan Alves da; Batista,Priscila Ferreira; Moura,Luciana Minervina de Freitas; Vital,Roberto Gomes; Costa,Alan Carlos. |
| ABSTRACT Drought is the most harmful environmental factor crop productivity. Some chemicals are used in agriculture to mitigate the damage from this stress on plants. Therefore, we examined whether the spraying of zinc sulfate (ZS), potassium phosphite (KPhi) and the hydrogen sulfide (H2S) donor sodium hydrosulfide (NaHS) would mitigate the deleterious effects of water deficit on sunflower plants by analyzing physiological and biometric characteristics. The experiment was carried out in a greenhouse using a randomized block design with five replications. The treatments were arranged in a 4 x 2 factorial scheme: [Factor A (Alleviators)] - spraying of KPhi (0.5 L ha-1), ZS (3.2 kg ha-1), NaHS (1.2 g ha-1), and water; [Factor B (substrate humidity, SH)] -... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Photosynthesis; Water deficit; Malonaldehyde; Leaf water potential; Mitigating substance. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542020000100225 |
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