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| Registros recuperados: 112 | |
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| Naoe,Alessandra M. de L.; Peluzio,Joênes M.; Campos,Leonardo J. M.; Naoe,Lucas K.; Silva,Roberta A. e. |
| ABSTRACT This study aimed to verify the effect of co-inoculation, association between Azospirillum brasilense and Bradyrhizobium japonicum bacteria, on soybean plants subjected to water deficit at two sowing dates. Two field experiments were conducted at the Universidade Federal de Tocantins, campus of Palmas, Brazil, in 2016. The experimental design was randomized blocks in a split-split-plot arrangement with four repetitions, where the plots consisted of two irrigation depths (100 and 25% of crop evapotranspiration - ETc), the subplots was composed of two methods of inoculant application (inoculation with Bradyrhizobium japonicum and co-inoculation with Azospirillum brasilense + Bradyrhizobium japonicum) and the sub-subplots comprised two soybean... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Glycine max (L.) Merrill; Rhizobacteria; Water stress; Irrigation. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662020000200089 |
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| Santos,Osvaldir F. dos; Lima,Sebastião F. de; Paiva Neto,Vespasiano B. de; Piati,Gabriel L.; Osório,Christian R. W. de S.; Souza,Hugo M. de. |
| ABSTRACT The objective of this work was to evaluate leaf gas exchanges of sweet corn as a function of defoliation when submitted to different irrigation depths. The experimental design was randomized blocks in split-plot scheme, with four irrigation depths in the plots [50, 75, 100 and 125% of crop evapotranspiration (ETc)], and three levels of defoliation in the subplots (0%, control; 35%, removal of four fully expanded leaves; 100%, total removal of the leaves - section of the aerial part) with three replicates. Defoliation was manually performed when the plant had four fully expanded leaves. It was verified that the dephs of irrigation and defoliation levels affect leaf gas exchanges in sweet corn plants, allowing the conclusion that the plant tends to... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Zea mays L. var. saccharata; Water stress; Photosynthesis. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662017001200822 |
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| Barbosa,Eduardo Augusto Agnellos; Ayub,Ricardo Antonio; Luz,Ângela da; Pessenti,Isabela Leticia; Pereira,André Belmont. |
| Abstract The current study aimed at evaluating gas exchanges, yield, water use efficiency and fruit quality of cape gooseberry in response to different irrigation depths with or without mulching of oat residues on pots at greenhouse conditions. Four irrigation depths were tested: 50%, 100%, 125% e 150% of reference evapotranspiration (ETo). Leaf gas exchanges were evaluated by an infrared gas analyzer at different stages of the crop. Throughout the harvest, yield per plant and yield components were assessed in conjunction with water-use efficiency (WUE) and fruit quality responses. Stomata conductance at the flowering and fructification stages showed a smaller limitation under the treatments 125 and 150%ETo. It should be noticed that the aforementioned... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Physalis peruviana L.; Water stress; Stomata conductance; Photosynthesis; Fruit yield. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452019000406001 |
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| KLUMB,ELSA KUHN; RICKES,LETICIA NEUTZLING; BRAGA,EUGENIA JACIRA BOLACEL; BIANCHI,VALMOR JOÃO. |
| ABSTRACT The state of Rio Grande do Sul is the largest peach productor in Brazil; however, it still possesses poor yield values when compared with other states. One of the problems associated with this is the occurrence of soils with drainage problems, mainly in Pelotas region, which depending on the year period, may undergo water deficit or flooding situations in the great majority of the years, which harm the crop development and yield. Among the harmful effects caused by these stresses stand out, the decrease in the net assimilation rate, closure of stomata, reduction of the cell activities, production of reactive oxygen species, membrane and protein destabilization. Thus, the aim of this study was to investigate in what magnitude of the gaseous... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Water stress; Photosynthesis; Peach tree; Plum tree. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452017000400706 |
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| Pádua,Gilda Pizzolante De; França-Neto,José De Barros; Carvalho,Maria Laene Moreira De; Krzyzanowski,Francisco Carlos; Guimarães,Renato Mendes. |
| Hot and dry weather conditions during soybean [Glycine max (L.) Merrill] seed maturation can cause forced maturation of the seed, resulting in the production of high levels of green seed, which may be detrimental to seed germination. These stressful conditions were imposed on soybean plants during seed maturation to investigate the production of green seeds and seed quality. Plants of the CD 206 cultivar were grown in a greenhouse until the R5.5 growing stage and then transferred to phytotrons at R6 and R7.2 for stress induction. Plants were subjected to two temperature regimes, high (28ºC to 36ºC) and normal (19ºC to 26ºC), and four soil water availability conditions, control (adequate water supply), 30% gravimetric moisture (GM), 20% GM and no water... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Glycine max; Seed quality; Temperature stress; Water stress. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-31222009000300017 |
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| MALDONADO,CARLOS; SQUEO,FRANCISCO A; IBACACHE,ERIC. |
| ABSTRACT Environmental-induced phenotypic variation in plants is often considered to be a functional response that maximizes fitness in heterogeneous environments. Lycopersicon chilense, a tomato species endemic to Atacama Desert, shows altitudinal phenotypics variations in their natural environments, which could be due to different soil water availabilities. It is hypothesized that (a) seeds coming from populations of different environments, cultivated in the same environment, will have similar phenotypes, if populations are not genetically differentiated, and that (b) the different populations subjected to two drought levels should vary their phenotypic constitution with respect to the control groups. The responses of twenty phenotypic traits to... |
| Tipo: Journal article |
Palavras-chave: Phenotypic response; Water stress; Physiological adjustment; Self-organization; Wild tomato. |
| Ano: 2003 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2003000100012 |
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| Silva,Weslley Costa; Moura,Joana Gomes de; Oliveira,Alexandre Bosco de; Ferreira,Leonardo Elias; Silva,Tatiana Maria da. |
| ABSTRACT The cowpea is one of the main crops of economic and social importance in the northeast of Brazil. However, the growing need to increase crop yield has prompted the use of irrigation water with high levels of salts. The aim of this study therefore, was to evaluate the effects of different irrigation depths and rates of liquid biofertilizer on growth and gas exchange in cowpea plants under saline conditions. The experiment was conducted in a randomized block design, using a scheme of split lots consisting of four irrigation depths with saline water (75, 100, 125 and 150% of crop evapotranspiration - ETc) and sub-lots of four different doses of biofertilizer (0; 5,000; 10,000 and 15,000 L ha-1). At 75 days after sowing (DAS), readings were taken of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Vigna unguiculata (L.) Walp; Water stress; Organic matter. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902017000500756 |
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| Valadares,Jane; Paula,Nádia Figueiredo de; Paula,Rinaldo Cesar de. |
| With the expansion of the cultivation of eucalyptus into areas with limited water resources, recommending genotypes which are tolerant to low water availability is important in order to maximize productivity under such conditions. The aim of this work therefore was to evaluate five hybrids of Eucalyptus grandis x E. urophylla (H1 to H5) subjected to four irrigation regimes in the greenhouse: daily (IR1), every two days (IR2), every four days (IR4) and every six days (IR6). The following characteristics were evaluated: photosynthetic rate (A), transpiration (E), stomatal conductance (g s), leaf water potential (Ψw), leaf relative water content, photochemical efficiency and chlorophyll content index. Evaluations of A, g s and E were carried out on two... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Water stress; Forest improvement; Physiological characteristics. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902014000400019 |
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| Silva,Eranildo Brasil da; Carneiro,Maria Socorro de Souza; Furtado,Rafael Nogueira; Lopes,Marcos Neves; Braga,Marilena de Melo. |
| ABSTRACT The study of cultivars with moderate flood tolerance is essential to their use in pastures irrigated with saline water. The aim of this study was to evaluate the chemical composition of Panicum maximum ‘BRS Zuri’ under the effect of different irrigation depths and levels of salinity. A randomised block design of split plots was used with five replications per treatment. The treatments resulted from the combination of three levels of water salinity (S1 = 0.6, S2 = 1.8 and S3 = 3.0 dS m-1) and four levels of irrigation (I1 = 60%, I2 = 80%, I3 = 100% and I4 = 120% of the evapotranspiration). The chemical composition of the grass, Panicum maximum ‘BRS Zuri’, cut at 28 days, was evaluated over two cycles. There was an interaction between the factors... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Saline water; Water stress; Dry matter; Pasture. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902020000100416 |
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| Deuner,Sidnei; Alves,José Donizeti; Zanandrea,Ilisandra; Goulart,Patrícia de Fátima Pereira; Silveira,Neidiquele Maria; Henrique,Paôla de Castro; Mesquita,Alessandro Carlos. |
| Coffee (Coffea arabica) plants show a positive relationship between stomatal closure and formation and accumulation of H2O2. However, for coffee plants under water restriction such relationship has never been studied. The objective of the present study was evaluate the stomatal movement and the antioxidant capacity of coffee seedlings under different water regimes. Eight months old coffee seedlings of cv. Catuaí IAC 99 were submitted to field capacity, gradual and total suspension of irrigation during a period of 21 days. Evaluations of leaf water potential (Ψw) were performed in the beginning of the morning, and stomatal resistance, transpiration rate and vapor pressure deficit were determined at 10 am and 5 pm. All biochemical and enzymatic... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Coffea arabica; Oxidative stress; Antioxidants; Water stress. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000100012 |
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| Calvache,M.; Reichardt,K; Bacchi,O.O.S.; Dourado-Neto,D.. |
| To identify specific growth stages of the common bean crop at which the plant is less sensitive to water stress, in which irrigation could be omitted without significant decrease hi final yield, two field experiments were conducted at "La Tola" University Experimental Station, Tumbaco, Pichincha, Ecuador, on a sandy loam soil (Typic Haplustoll). The climate is tempered and dry (mean air temperature 16°C and mean relative humidity 74%, during the cropping season) 123 and 109 mm of rainfall were recorded during the experimental cropping periods (July to October), of 1992 and 1994, respectively. The treatments consisted of combinations of 7 irrigation regimes including normal watering; full stress; (traditional management practice); single stress at... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Common bean; Irrigation; Water stress; Water use efficiency. |
| Ano: 1997 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161997000300002 |
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| Sánchez-Román,Rodrigo Máximo; Folegatti,Marcos Vinicius; Orellana González,Alba María Guadalupe; Silva,Rogério Teixeira da. |
| The Piracicaba, Capivari and Jundiaí River Basins (RB-PCJ) are located in the States of Minas Gerais and São Paulo, Brazil. By 2005, 5.8% of Brazil's General National Product-GNP was produced there. Such economic development has created a huge demand for water resources. The availability of water resources was assessed by running a dynamic systems simulation model to manage these resources in the RB-PCJ (WRM-PCJ), considering five 50-year simulations. WRM-PCJ was developed as a tool to aid the RB-PCJ Watershed Committee. The model computes water supply, demands, and contamination load from several consumers. When considering a Business-as-Usual scenario, by 2054, water demands will have increased up to 76%, 39% of the available water will come from... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Water stress; Water management; Watershed; Modeling. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000400001 |
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| Liu,Yi; Yang,Shenjiao; Li,Shiqing; Chen,Fang. |
| Effects of meteorological variables on crop production can be evaluated using various models. We have evaluated the ability of the Hybrid-Maize model to simulate growth, development and grain yield of maize (Zea mays L.) cultivated on the Loess Plateau, China, and applied it to assess effects of meteorological variations on the performance of maize under rain-fed and irrigated conditions. The model was calibrated and evaluated with data obtained from field experiments performed in 2007 and 2008, then applied to yield determinants using daily weather data for 2005-2009, in simulations under both rain-fed and irrigated conditions. The model accurately simulated Leaf Area Index , biomass, and soil water data from the field experiments in both years, with... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Crop simulation; Maize model; Potential productivity; Water stress; Spring maize. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162012000500003 |
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| Vieira,Roberval Daiton; Scappa Neto,Angelo; Bittencourt,Sonia Regina Mudrovitsch de; Panobianco,Maristela. |
| Vigor of soybean [Glycine max (L.) Merrill] seeds can be evaluated by measuring the electrical conductivity (EC) of the seed soaking solution, which has shown a satisfactory relationship with field seedling emergence, but has not had aproper definition of range yet. This work studies the relationship between EC and soybean seedling emergence both in the field and laboratory conditions, using twenty two seed lots. Seed water content, standard germination and vigor (EC, accelerated aging and cold tests) were evaluated under laboratory conditions using -0.03; -0.20; -0.40 and -0.60 MPa matric potentials, and field seedling emergence was also observed. There was direct relationship between EC and field seedling emergence (FE). Under laboratory conditions, a... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Glycine max; Vigor; Physiological quality; Water stress. |
| Ano: 2004 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000200007 |
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| Melo,Suzana Pereira de; Korndörfer,Gaspar Henrique; Korndörfer,Clotilde Maria; Lana,Regina Maria Quintão; Santana,Denise Garcia de. |
| The beneficial effects of silicon (Si) fertilization have been observed for several plant species, especially when submitted to stress, either biotic or abiotic. Among the possible reasons for the greater adaptability and resistance of brachiaria grass in areas of low fertility soils in Brazilian savanna, stands its capacity of absorbing and accumulating Si in aerial parts. To evaluate the effect of Si on dry matter yield of Brachiaria decumbens Stapf and Brachiaria brizantha Hochst, grown under two soil moisture regimes, a trial was set up in a completely randomized design factorial scheme (5 × 2 × 2), with five Si rates: (0; 242; 484; 968 and 1,452 kg ha-1), two soil water tensions (60% and 80% of field capacity) and the two brachiaria species. The... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Calcium silicate; Pasture; Water stress; Soil moisture. |
| Ano: 2003 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000400022 |
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| Silva,Marcelo de Almeida; Silva,Jorge Alberto Gonçalves da; Enciso,Juan; Sharma,Vivek; Jifon,John. |
| Water deficit is one of the major factors limiting the production of sugarcane (Saccharum officinarum L.). A study of the effects of limited water condition on yield components and their relationship with productivity can aid breeding programs in selecting for high yielding genotypes under this condition. The objective of this study was to investigate the relationships among the parameters stalk number, stalk height, stalk diameter, and stalk weight with cane yield in sugarcane growing in a field under moderate water stress during its grand growth period, in order to provide information to help breeders in adopting traits for selecting drought tolerant varieties. Seventy-eight genotypes plus two controls, one drought-tolerant and one drought-susceptible,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Saccharum spp.; Biometric attributes; Productivity; Water stress; Genotypes. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000600008 |
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| Sato,Michel Keisuke; Lima,Herdjania Veras de; Ferreira,Raphael Leone da Cruz; Rodrigues,Sueli; Silva,Álvaro Pires da. |
| ABSTRACT In areas cultivated with oil palm, typically mechanized field operations using heavy vehicles may negatively affect soil physical properties and productivity. The aim of this study was to evaluate soil physical quality in an area cultivated with oil palm by monitoring the temporal variation of the soil water content and relating it to the critical limits of the least limiting water range. Soil bulk density (Bd), soil penetration resistance (SR), least limiting water range (LLWR), and water stress days (WSD) were used to assess soil physical quality in planting rows (PR) and the traffic zone (TZ) at depths 0-20, 20-40, and 40-60 cm. The Bd was higher and the LLWR was reduced in TZ only at the surface layer. The effect of temporal variation in soil... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Elaeis guineensis Jacq; Soil physical quality; Soil compaction; Water stress. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162017000200148 |
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| Registros recuperados: 112 | |
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