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| Registros recuperados: 77 | |
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| Aguilar Benítez, Gisela. |
| Se ha evidenciado que la vermicomposta puede mejorar la germinación y el crecimiento y productividad de las plantas; sin embargo, su efecto combinado con déficit de humedad ha sido escasamente documentado. El objetivo de esta investigación fue evaluar el efecto de la vermicomposta en la germinación, crecimiento inicial y rendimiento en plantas C3 y C4, con déficit de humedad en el suelo. En laboratorio se evaluó la germinación de dos cultivares de frijol y dos de maíz, con respuesta contrastante a sequía, en suelo sin y con 1.5, 3, 6 y 9 % de vermicomposta, y con potenciales de agua (ΨA) de -0.03 y -2 MPa; en invernadero se cuantificó el intercambio de gases y crecimiento de maíz, así como algunos componentes del rendimiento de frijol, en suelo sin y con... |
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Palavras-chave: Estrés; Floración; Semilla; Germinación; Uso eficiente del agua; Stress; Flowering; Seeds; Germination; Water use efficiency; Doctorado; Botánica. |
| Ano: 2011 |
URL: http://hdl.handle.net/10521/452 |
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| Campos García, Huitziméngari. |
| Se estudió el efecto de tres niveles de secado parcial de la raíz (SPR) en comparación con riego convencional, en términos de intercambio de gases, relaciones hídricas, crecimiento, ajuste osmótico, rendimiento, calidad del fruto, estado nutrimental y eficiencia en el uso del agua en tomate (Lycopersicon esculentum Mill.). Se aplicaron cuatro tratamientos: Testigo, en el que la humedad aprovechable residual (HAR) en el sistema radical completo se permitió llegara hasta un 90 %; SPR90-30, en donde en un lado de la raíz dividida la HAR se permitió llegara al 90 % y el otro al 30 %; PRD70-30, en donde en un lado de la raíz dividida la HAR llegó al 70 % y el otro al 30 %; y PRD50-30 en donde en un lado de la raíz dividida la HAR llegó al 50 % y el otro al 30... |
| Tipo: Tesis |
Palavras-chave: Secado parcial de la raíz; Intercambio de gases; Eficiencia en el uso del agua.; Rendimiento.; Calidad del fruto.; Tomate; Maestría; Fisiología Vegetal; Partial rootzone drying; Gas exchange.; Water use efficiency; Yield; Fruit quality; Tomato. |
| Ano: 2007 |
URL: http://hdl.handle.net/10521/1596 |
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| Talamantes Castorena, Ismael. |
| El estado de Sinaloa es el principal productor de maíz en México bajo riego, aportando el 65% de la producción nacional, sin embargo, la eficiencia de aplicación de riego se mantiene en 45% y escenarios frecuentes de baja disponibilidad hídrica, han puesto en riesgo la estabilidad económica y social del estado. Con el fin de generar alternativas tecnológicas de aplicación inmediata que contribuyan a mejorar la eficiencia en el uso del agua del maíz, en el presente estudio se evaluaron cinco técnicas parcelarias de riego por gravedad de alta eficiencia: 1) surcos alternos, 2) camas, 3) reducción de gasto, 4) riego intermitente y 5) riego deficitario, comparándolas con el sistema tradicional (testigo). El estudio se realizó en el distrito de riego 075 (norte... |
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Palavras-chave: Diseño; Riego de precisión; Productividad del agua; Rendimiento; Design; Irrigation technique; Water use efficiency; Yield; Hidrociencias; Maestría. |
| Ano: 2013 |
URL: http://hdl.handle.net/10521/2136 |
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| Aguilar Benítez, Gisela. |
| Se ha evidenciado que la vermicomposta puede mejorar la germinación y el crecimiento y productividad de las plantas; sin embargo, su efecto combinado con déficit de humedad ha sido escasamente documentado. El objetivo de esta investigación fue evaluar el efecto de la vermicomposta en la germinación, crecimiento inicial y rendimiento en plantas C3 y C4, con déficit de humedad en el suelo. En laboratorio se evaluó la germinación de dos cultivares de frijol y dos de maíz, con respuesta contrastante a sequía, en suelo sin y con 1.5, 3, 6 y 9 % de vermicomposta, y con potenciales de agua (ΨA) de -0.03 y -2 MPa; en invernadero se cuantificó el intercambio de gases y crecimiento de maíz, así como algunos componentes del rendimiento de frijol, en suelo sin y con... |
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Palavras-chave: Estrés; Floración; Semilla; Germinación; Uso eficiente del agua; Stress; Flowering; Seeds; Germination; Water use efficiency; Doctorado; Botánica. |
| Ano: 2011 |
URL: http://hdl.handle.net/10521/452 |
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| Gordon, Line; Stockholm University; line@system.ecology.su.se; Folke, Carl; Stockholm University; calle@system.ecology.su.se; Falkenmark, Malin; Swedish Natural Science Research Council;; Engwall, Maria; ;. |
| Global freshwater assessments have not addressed the linkages among water vapor flows, agricultural food production, and terrestrial ecosystem services. We perform the first bottom-up estimate of continental water vapor flows, subdivided into the major terrestrial biomes, and arrive at a total continental water vapor flow of 70,000 km3/yr (ranging from 56,000 to 84,000 km3/yr). Of this flow, 90% is attributed to forests, including woodlands (40,000 km3/yr), wetlands (1400 km3/yr), grasslands (15,100 km3/yr), and croplands (6800 km3/yr). These terrestrial biomes sustain society with essential welfare-supporting ecosystem services, including food production. By analyzing the freshwater requirements of an increasing demand for food in the year 2025, we... |
| Tipo: Peer-Reviewed Reports |
Palavras-chave: Catchment management; Ecohydrological landscape; Evapotranspiration; Food production; Freshwater management; Global freshwater assessment; Resilience; Terrestrial ecosystem services; Trade-offs; Water use efficiency; Water vapor flows.. |
| Ano: 1999 |
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| Santos,Marcelo R. Dos; Donato,Sérgio L. R.; Faria,Leandro N.; Coelho,Eugênio F.; Cotrim Junior,Paulo R. F.. |
| ABSTRACT With the limited availability of water in semi-arid regions, it is necessary that irrigation is accurate and there is high water use efficiency. This study aimed to evaluate the regulated deficit irrigation (RDI) and partial rootzone drying (PRD) in yield, water use efficiency and gas exchange of ‘Tommy Atkins’ mango tree in semi-arid conditions. The experimental design was a randomized block with seven treatments for RDI under micro sprinkler and five treatments for the PRD under drip. Treatments were applied in phases PI - early blooming to early fruit expansion, PII - early expansion to early physiologic ripening and in phase III - physiologic ripening of fruits, with application of the RDI of 100, 75 and 50 % of ETc in different combinations... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Mangifera; Water deficit; Water use efficiency. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162016000601096 |
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| Marouelli,Waldir Aparecido; Abdalla,Rômulo P; Madeira,Nuno R; Silva,Henoque R da; Oliveira,Aureo S de. |
| The objective of the present study was to evaluate the effects of crop residue covers (0.0; 4.5; 9.0; 13.5 t ha-1 millet dry matter) on water use and production of onion cultivated in no-tillage planting system (NT) as compared to conventional tillage system (CT). The study was carried out at Embrapa Hortaliças, Brazil, under the typical Savanna biome. Irrigations were performed using a sprinkle irrigation system when soil-water tension reached between 25 and 30 kPa. The experimental design was randomized blocks with three replications. Total net water depth applied to NT treatment was 19% smaller than the CT treatment, however, water savings increased to 30% for the first 30 days following seedlings transplant. Crop biomass, bulb size and yield, and rate... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Allium cepa L.; Reduced tillage; Water use efficiency; Irrigation; Savannah. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362010000100004 |
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| Marques,Patricia Angélica A; Bernardi Filho,Lineu; Oliveira,Ricardo B de. |
| The purpose of this experiment was to analyze the effect of five irrigation water depths on oregano production. Oregano is a plant rich in essential oil, commonly used as seasoning in food preparation. The water depths were estimated based on the class A pan evaporation (CPE): 0 CPE (without water replacement); 25 CPE, 50 CPE, 75 CPE, and 100% CPE. The analyzed variables were fresh and dry weight of leaves and roots, yield, net return, and water use efficiency. The experiment was carried out in Presidente Prudente, São Paulo State, Brazil, from February to May 2006. The best results for all the studied variables were found when 100% CPE was used. A linear positive relation was observed between water increments and fresh and dry weight of both the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Origanum vulgare L.; Evaporation; Medicinal plants; Yield; Net profit; Water use efficiency. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362009000100012 |
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| Aguilos, Maricar; Stahl, Clement; Burban, Benoit; Herault, Bruno; Courtois, Elodie; Coste, Sabrina; Wagner, Fabien; Ziegler, Camille; Takagi, Kentaro; Bonal, Damien. |
| Warmer and drier climates over Amazonia have been predicted for the next century with expected changes in regional water and carbon cycles. We examined the impact of interannual and seasonal variations in climate conditions on ecosystem-level evapotranspiration (ET) and water use efficiency (WUE) to determine key climatic drivers and anticipate the response of these ecosystems to climate change. We used daily climate and eddyflux data recorded at the Guyaflux site in French Guiana from 2004 to 2014. ET and WUE exhibited weak interannual variability. The main climatic driver of ET and WUE was global radiation (Rg), but relative extractable water (REW) and soil temperature (Ts) did also contribute. At the seasonal scale, ET and WUE showed a modal pattern... |
| Tipo: Text |
Palavras-chave: Tropical rainforest; Evapotranspiration; Water use efficiency; Drought; Radiation. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00484/59572/62542.pdf |
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| Silva,Alisson Jadavi Pereira da; Coelho,Eugênio Ferreira; Miranda,Jarbas Honorio de; Workman,Stephen Ray. |
| The objective of this work was to evaluate root and water distribution in irrigated banana (Musa sp.), in order to determine the water application efficiency for different drip irrigation emitter patterns. Three drip emitter patterns were studied: two 4-L h-1 emitters per plant (T1), four 4-L h-1 emitters per plant (T2), and five 4-L h-1 emitters per plant (T3). The emitters were placed in a lateral line. In the treatment T3, the emitters formed a continuous strip. The cultivated area used was planted with banana cultivar BRS Tropical, with a 3-m spacing between rows and a 2.5-m spacing between plants. Soil moisture and root length data were collected during the first production cycle at five radial distances and depths, in a 0.20x0.20 m vertical grid. The... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Musa spp.; Root distribution; Rootzone processes; TDR; Water use efficiency. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2009000700013 |
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| Gonçalves,José Francisco de Carvalho; Santos Júnior,Ulysses Moreira dos; Silva,José Ferreira da; Arruda,Murilo Rodrigues de; Bonates,Luiz Carlos de Matos; Fernandes,Andreia Varmes. |
| The objective of this work was to analyze gas exchange, photosynthetic characteristics, photochemical efficiency of photosystem II and anatomical characteristics of young plant leaves of two guarana (Paullinia cupana) clones (BRS-CG372RC and BRS-CG611RL) growing under open field. The variables of gas exchange and fluorescence of chlorophyll a were evaluated in mature leaves. The values of photosynthesis and transpiration found for BRS-CG372RC were 27% greater and 80% lesser than values found for BRS-CG611RL, respectively. The values of stomatal conductance found for the clones BRS-CG372RC and BRS-CG611RL were in the order of 224 and 614 mmol mm-2 s-1, respectively. The values of photorespiration, rate of carboxylation and rate electron transport were... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Paullinia cupana; Photosynthesis; Photochemical efficiency of photosystem II; Electron transport rate; Water use efficiency; Stomatal anatomy. |
| Ano: 2006 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2006000300004 |
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| Lobo,Francisco de Almeida; Oliva,Marco Antonio; Resende,Morethson; Lopes,Nei Fernandes; Maestri,Moacyr. |
| The objective of this work was to determine the critical irrigation time for common bean (Phaseolus vulgaris L. cv. Carioca) using infrared thermometry. Five treatments were analyzed. Canopy temperature differences between plants and a well-watered control about 1, 2, 3, 4, and 5±0.5ºC were tested. Physiological variables and plant growth were analyzed to establish the best time to irrigate. There was a significant linear correlation between the index and stomatal resistance, transpiration rate, and leaf water potential. Although significant linear correlation between the index and mean values of total dry matter, absolute growth rate, and leaf area index was found, no correlation was found with other growth index like relative growth rate, net... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Irrigation scheduling; Water use efficiency; Growth rate. |
| Ano: 2004 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2004000200003 |
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| Kendy, Eloise; Molden, David J.; Steenhuis, Tammo S.; Liu, Changming; Wang, Jinxia. |
| The report examines the relationships between agricultural policies in the North China Plain, the approaches to water management that evolved from them, the quantity of water that was actually used, and the consequent groundwater depletion beneath Luancheng County, Hebei Province, from 1949 to 2000. To systematically address these relationships, we use a comprehensive water-balance approach. Our results indicate that a single, longstanding policy-that of using groundwater to meet the crop-water requirements not supplied by precipitation-is responsible for the steady rate of groundwater decline. |
| Tipo: Report |
Palavras-chave: Agricultural production; Groundwater; Aquifers; Water shortage; Irrigation efficiency; Agricultural policy; Crop production; Wastewaters; Water management; Hydrology; Economic development; Crop yield; Cotton; Wheat; Sprinkler irrigation; Water conservation; Water use efficiency; Pumping; Water balance; Vegetables; Rural economy; Irrigated framing; Community/Rural/Urban Development; Crop Production/Industries; Environmental Economics and Policy. |
| Ano: 2003 |
URL: http://purl.umn.edu/44560 |
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| Registros recuperados: 77 | |
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