Search results for "Water use efficiency."

showing 4 items of 14 documents

Water Status and Yield Response to Deficit Irrigation and Fertilization of Three Olive Oil Cultivars under the Semi-Arid Conditions of Tunisia

2019

Sustainability of olive production is possible by adopting the modern techniques of irrigation and fertilization. In Tunisia, olive trees are usually cultivated in poor soils, under semi-arid conditions characterized by water scarcity. This study investigated the effects of different water supply and fertilization on leaf water status and crop yield of three different olive oil varieties cultivated in central Tunisia, during four experimental seasons (2014&ndash

0106 biological sciencesFertigationIrrigationfertigationGeography Planning and DevelopmentDeficit irrigationTJ807-830Growing seasonManagement Monitoring Policy and LawTD194-19501 natural sciencesRenewable energy sourceschemlaliand koroneiki olive oil varietiesSettore AGR/08 - Idraulica Agraria E Sistemazioni Idraulico-Forestaliwater use efficiency (WUE)GE1-350CultivarWater-use efficiencychetouimidday leaf water potentialdeficit irrigationEnvironmental effects of industries and plantsRenewable Energy Sustainability and the EnvironmentCrop yield04 agricultural and veterinary sciencesand koroneiki olive oil varietieOlive treesEnvironmental sciencesHorticulture040103 agronomy & agriculture0401 agriculture forestry and fisheriesEnvironmental science010606 plant biology & botanySustainability
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Compared regimes of NDVI and Rainfall in semi-arid regions of Africa

2006

International audience; Bi-monthly normalized difference vegetation index (NDVI) at an 8km spatial resolution from the advanced very high resolution radiometers (AVHRR) was used from 1981 to 1995 to analyse the vegetation response to rainfall supply in semi-arid regions of Africa. Within the 200-600 mm annual rainfall belt, for which the apparent NDVI response to rainfall was the strongest, three regions were selected which exhibited different patterns in their NDVI regimes and/or relationships with rainfall. The regions, located in western, southern and eastern Africa, were split into coherent sub-regions in terms of mean regime of photosynthetic activity through a cluster analysis. Overal…

SupplyrainfallevapotranspirationConcentration distribution[SDU.STU.CL] Sciences of the Universe [physics]/Earth Sciences/ClimatologyCluster analysisVegetation indexvegetationRainfall ratePlant cover[ SDE.MCG.CG ] Environmental Sciences/Global Changes/domain_sde.mcg.cgannual averagespatial resolutionphotosynthesisexhibits1995high resolution[SDE.MCG.CG] Environmental Sciences/Global Changes/domain_sde.mcg.cgStructureWater use efficiencyResponsePluviometrycorrelationAfricaGeneral Earth and Planetary SciencesSemi arid zone[ SDU.STU.CL ] Sciences of the Universe [physics]/Earth Sciences/ClimatologySouthern AfricaRainy season
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Response of grapevine (Cabernet Sauvignon cv) to above ground and subsurface drip irrigation under arid conditions

2018

Abstract The response of wine grapes to irrigation systems was investigated in a Cabernet Sauvignon/140 Ru vineyard in sandy loam soil in Sicily during a two-year study. Two different drip irrigation systems were evaluated: one surface drip and two subsurface drip irrigation systems, with the trickle line located at different distances from vine trunks. Vegetative and quantitative parameters, must quality and root distribution were compared among irrigation treatments. During the two study years, irrigation of grapevines via a subsurface drip system resulted in greater water use efficiency without affecting must composition. Establishing the trickle line near the trunk positively influenced…

0106 biological sciencesIrrigationDeficit irrigationSoil ScienceDrip irrigation01 natural sciencesVineyardRegulated deficit irrigationYield (wine)Root distributionWater-use efficiencyTRICKLEEarth-Surface ProcessesWater Science and TechnologyPredawn leaf water potentialPredawn leaf water potential; Regulated deficit irrigation; Root distribution; Water use efficiency; Yield and grape quality;Water use efficiency04 agricultural and veterinary sciencesSettore AGR/03 - Arboricoltura Generale E Coltivazioni ArboreeAgronomyLoamYield and grape quality040103 agronomy & agriculture0401 agriculture forestry and fisheriesEnvironmental scienceAgronomy and Crop Science010606 plant biology & botany
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Optimizing subsurface dripline installation depth with Hydrus 2D/3D to improve irrigation water use efficiency in the central Tunisia

2015

The main objective of the work is to optimize drip installation depth for Eggplant crop irrigated with surface or subsurface drip irrigation systems to improve irrigation Water Use Effeciency (WUE), by means of field measurements and simulations carried out with Hydrus-2D model. Initially, a comparison between simulated Soil Water Contents (SWC) and the corresponding measured in two plots, in which laterals with coextruded emitters are laid on the soil surface (T0) and at 20 cm depth (T20), respectively. In order to choose the best position of the lateral, the results of different simulation run, carried out by choosing a deeper installation (T45) depth. Simulated SWC’s resulted fairly clos…

HydrusTechnologywater use efficiencyTEnvironmental engineeringSoil scienceSoil surfaceDrip irrigationSubsurface drip irrigation soil water contents Hydrus 2D water use efficiency RMSEsoil water contentsIrrigation waterRMSESubsurface drip irrigationHydrus 2DSoil waterWater uptakeDNS root zoneEnvironmental scienceSettore AGR/08 - Idraulica Agraria E Sistemazioni Idraulico-ForestaliWater-use efficiencySafety Risk Reliability and Quality
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