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| Registros recuperados: 112 | |
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| Ahmad,S; Gul,S; Achakzai,AKK; Islam,M. |
| Seedling growth and development of Seriphidium quettense were examined under water stress (WS) and non-water stress (NWS) conditions. Seedlings were grown in pots to investigate their response to NWS conditions. Impact of WS on seedling growth was assessed in pre-existing plants grown under a semi-arid, natural environment. Seedling growth attributes were recorded on a monthly basis. Seedling growth exhibited a significant positive response under NWS conditions. Length of the main root axis at the first leaf emergence stage was 5.69 cm under NWS conditions; however, it was 4.8 cm in the natural environment (WS). At the end of the growing season, length of their primary root was 118 cm in NWS conditions. At the same time, it reached 8.8 cm in the WS natural... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Seriphidium quettense; Root and shoot growth; Water stress. |
| Ano: 2010 |
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572010000100004 |
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| Ghaderi-Far,F; Gherekhloo,J.; Alimagham,M.. |
| Laboratory and greenhouse experiments were conducted to determine the effects of drought and salinity stress, temperature, pH and planting depth on yellow sweet clover (Melilotus officinalis) germination and emergence. Base, optimum and ceiling germination temperatures were estimated as 0, 18.47 and 34.60 ºC, respectively. Seed germination was sensitive to drought stress and completely inhibited at a potential of -1 MPa, but it was tolerant to salinity. Salinity stress up to 90 mM had no effect over the M. officinalis seed germination, but the germination decreased by increasing the salt concentration. The drought and salinity required for 50% inhibition of maximum germination were 207 mM and -0.49 MPa, respectively. High percentage of seed germination... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Germination; PH; Salinity stress; Soil depth; Temperature; Water stress. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582010000300002 |
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| Zambão,Jackson; v.H. Bittencourt,Henrique; T.S. Bonome,Lisandro; M. Trezzi,Michelangelo; C.P.P. Fernandes,Augusto. |
| Abstract Background: Substantial losses to crops can occur due to the presence of sourgrass in agroecosystems, which is promoted by its seed dispersal ability. Environmental factors can affect sourgrass germination and emergence. Objective: The objective of this study was to determine the effects of water restriction, salinity, and depth of sowing on the sourgrass germination and emergence processes. Methods: Experiments using sourgrass seeds were conducted under controlled conditions simulating osmotic and saline stress and seeding depths. The data collected was submitted to analysis of variance and adjusted to models by regression analysis. Results: Smaller osmotic potentials reduced germination, normal seedlings, and increased quiescence, with no... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Digitaria insularis; Water stress; Seeding depth. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582020000100307 |
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| McCartney, Matthew P.; Lankford, Bruce A.; Mahoo, Henry F.. |
| With contributions from Julien Cour, Reuben Kadigi, Japhet Kashaigili, Magayane Machibya, Abraham Mehari, Sylvie Morardet, Kossa Rajabu, Charles Sokile, Siza Tumbo, Barbara van Koppen, Thalia Vounaki and Daniel Yawson |
| Tipo: Report |
Palavras-chave: River basin management; Water stress; Irrigation programs; Irrigation management; Irrigation efficiency; Water use; Water allocation; Wetlands; Water rights; Water law; Economic aspects; Water rates; User charges; Water users associations; Decision support tools; Crop Production/Industries; Environmental Economics and Policy; Farm Management; Land Economics/Use; Productivity Analysis; Resource /Energy Economics and Policy. |
| Ano: 2007 |
URL: http://purl.umn.edu/37668 |
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| Gubiani,Paulo Ivonir; Müller,Eduardo Augusto; Somavilla,André; Zwirtes,Anderson Luiz; Mulazzani,Rodrigo Pivoto; Marchesan,Enio. |
| ABSTRACT Water and oxygen deficiencies in the soybean crop cultivated on lowland soils are an important topic of research. The objective of this study was to investigate changes in water and oxygen supply and soybean yield caused by soil management in lowland soils. A soybean crop was grown under four soil conditions: no-tillage (NT), chiseling (CH), ridge tillage on no-tillage (NTR), and ridge tillage on chiseling (CHR). Soil bulk density, total porosity, macro- and microporosity, air permeability, and saturated hydraulic conductivity were measured at 0.05, 0.15, 0.25, and 0.35 m depths. Soil volumetric water content was monitored at the same depths every 30 min during the soybean cycle. The transpiration coefficient was calculated from volumetric water... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Water stress; Oxygen deficiency; Water table. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832018000100414 |
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| Vellame,Lucas M.; Coelho Filho,Maurício A.; Paz,Vital P. S.; Coelho,Eugênio F.. |
| The present study had as its main objective the evaluation of the heat balance method in young orange and mango plants under protected environment. The work was carried out at Embrapa Cassava and Tropical Fruits, Cruz das Almas, BA. Later on, estimates of sap flow were conducted for two mango plants cultivated in pots of 15 and 50 L installed on weighting platforms of 45 and 140 kg; sap flow was determined in three orange plants, two of which were also installed on weighing platforms. The values of sap flow were compared to the transpiration measured by lysimeters at integrated intervals of 1, 2, 4 and 24 h. The heat balance method showed good precision for estimating daily transpiration (R² = 0.95 and R² = 0.90), accompaning the availability of energy in... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Sap flow; Lysimeters; Citrus; Water stress. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662010000600005 |
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| Dallacort,Rivanildo; Freitas,Paulo S. L. de; Faria,Rogério T. de; Gonçalves,Antonio C. A.; Jácome,Aleksandra G.; Rezende,Roberto. |
| The performance of the CROPGRO-Drybeans model for the prediction of soil water balance, as well as growth components and bean crop yield, was assessed using data from two field experiments conducted at the State University of Maringá Irrigation Technical Center, Paraná - Brazil, (latitude 23º27'S, longitude 51º57' and altitude 542 m), during the 2005 and 2006 growing season. The model simulations correlated well with measured soil moisture (r > 0.7) for both experiments. However, there were high discrepancies between measured and simulated soil moisture values on the days after rainfall. In addition, it was found that the model exaggerates the effect of water stress during the flowering phase, which leds to underprediction (19 and 29%) of crop yield. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Water stress; Soil moisture; Simulation. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662010000400002 |
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| Aleman,Catariny C.; Marques,Patricia A. A.. |
| ABSTRACT The therapeutic efficacy of herbal medicines and pesticides has increased the need to define cultivation parameters for medicinal plants. The objective of this study was to evaluate the production of essential oil and flavonoids of chamomile under irrigation levels and organic fertilizer doses. The experiment was conducted in the experimental area of the Campus II of the University of Western São Paulo, in the city of Presidente Prudente, SP, Brazil. The experimental design was a randomized block in triple factorial (6 x 2 x 3), corresponding to irrigation depths (150, 100, 75, 50, 25 and 0% of the reference evapotranspiration (ETo)), organic fertilizers (poultry manure and cattle manure) and the fertilizer doses (0, 3 and 5 kg m-2), with four... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Chamomilla recutita (L.) Rauschert; Medicinal plants; Water stress; Irrigation management; Organic production. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662016001201045 |
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| Bastos,Fabiano J. de C.; Soares,Frederico A. L.; Sousa,Camylla V.; Tavares,Cássio J.; Teixeira,Marconi B.; Sousa,Antonio E. C.. |
| ABSTRACT The objective of this study was to evaluate the performance of the common bean crop grown with application of osmoprotectants based on algae of the genus Durvillaea potatorum in the winter crop season, with occurrence or not of water suppression. The experiment used a randomized block design, in split plots, arranged in a 4x7 factorial scheme, in which the plots were composed of four treatments - periods of water suppression (7, 14, 21 days and the control treatment: 100% of field capacity throughout the crop cycle) and the subplots consisted of seven types of osmoprotectants. The treatments with osmoprotectants was applied during the full flowering of the common bean. Three days after application of osmoprotectants, the treatments with... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Phaseolus vulgaris; Durvillaea potatorum; Water stress; Yield. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662016000800697 |
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| Lima,Alan D.; Bezerra,Francisco M. S.; Neves,Antônia L. R.; Sousa,Carlos H. C. de; Lacerda,Claudivan F. de; Bezerra,Antônio M. E.. |
| ABSTRACT The objective of this study was to evaluate the growth of forest species under conditions of salinity and water deficit. The experimental design was completely randomized in a triple factorial scheme with four forest species (Neem - Azadirachta indica A. Juss, ‘Aroeira’ - Myracrodruon urundeuva Fr Allemão, ‘Ipê’ - Tabebuia impetiginosa (Mart. ex. DC.) Standl and ‘Sabiá’ - Mimosa caesalpiniifoliaBenth), two salinity levels (1.2 and 8.6 dS m-1) and two water regimes (with and without water restriction). Plant height, stem diameter, number of leaves, shoot dry matter, root dry matter and total dry matter were measured. For all the studied variables, there was statistical significance for the factors species (A) and salinity (B), individually.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Native plants; Salt stress; Water stress. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662018001100753 |
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| Mamann,Ângela T. W De; Silva,José A. G. da; Scremin,Osmar B.; Mantai,Rubia D.; Scremin,Ari H.; Dornelles,Eldair F.. |
| ABSTRACT Nitrogen use efficiency in wheat biomass and grain yields can be favored by the biopolymer hydrogel. The objective of the study was to analyze the use of the biopolymer hydrogel applied to the seed in the optimization of fertilizer-N on wheat biomass and grain yields, under different conditions of agricultural year and succession systems of high and reduced release of residual-N. In the study, two experiments were conducted, with different farming systems, soybean/wheat and maize/wheat, one to quantify the biomass yield rate and the other to determine grain yield. The experiments were conducted in the years 2014 and 2015, in a randomized block design with four replicates in a 4 x 4 factorial scheme, corresponding to hydrogel doses (0, 30, 60 and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Triticum aestivum; Simulation; Farming systems; Water stress. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662017001000697 |
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| Loose,Luis H.; Heldwein,Arno B.; Silva,Jocélia R. da; Bortoluzzi,Mateus P.. |
| ABSTRACT Extreme natural events influencing soil water availability are major factors limiting yield and oil quality in oilseed crops. The aim of the present study was to assess the effect of water deficit and surplus water on yield, oil content and on the fatty acid profile of sunflower plants sown in main and second crop seasons in two soil classes in Rio Grande do Sul State. The experiment was carried out in Santa Maria, RS (Ultisol) and Panambi, RS state, Brazil (Oxisol), Brazil, and comprised three water conditions (water deficit, water surplus and control) in a randomized block design. The hybrid Helio 250 was sown in early September (main crop season) and in early January (second crop season) in both soil classes. Yield, yield components, oil... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Helianthus annuus L.; Water stress; Fatty acids. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662019000700532 |
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| Brunini,Rodrigo G.; Turco,José E. P.. |
| ABSTRACT Sugarcane (Saccharum officinarum L.) is a crop of vital importance to Brazil, in the production of sugar and ethanol, power generation and raw materials for various purposes. Strategic information such as topography and canopy temperature can provide management technologies accessible to farmers. The objective of this study was to determine water stress indices for sugarcane in irrigated areas, with different exposures and slopes. The daily water stress index of the plants and the water potential in the soil were evaluated and the production system was analyzed. The experiment was carried out in an “Experimental Watershed”, using six surfaces, two horizontal and the other ones with 20 and 40% North and South exposure slopes. Water stress level was... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Water stress; Leaf temperature; Slope; Water and soil management. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662016001000925 |
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| Registros recuperados: 112 | |
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