Search results for "riga"

Mass and surface energy balance approaches for monitoring water stress in vineyards

2013

Abstract Tree crops are representing one of most widespread agricultural systems in Mediterranean regions, thus contributing in a substantial way to the economy and productivity of primary sectors of the countries interested. Besides the aspects concerning their economical relevance, tree crops like vineyards, olive and orange orchards are also typical elements of the Mediterranean landscape, and their ecological role has been recently revitalised in consideration of their function as carbon sinks for the Kyoto agreement. The environmental and economical sustainability of these agricultural systems in arid and semi-arid zones has to cope with the availability and management of water resourc…

Discussion of “Analytical Equation for Variation of Discharge in Drip Irrigation Laterals” by V. Ravikumar, C. R. Ranganathan, and S. Santhana Bosu

2005

Determining water use of sorghum from two-source energy balance and radiometric temperatures

2011

Estimates of surface actual evapotranspiration (ET) can assist in predicting crop water requirements. An alternative to the traditional crop-coefficient methods are the energy balance models. The objective of this research was to show how surface temperature observations can be used, together with a two-source energy balance model, to determine crop water use throughout the different phenological stages of a crop grown. Radiometric temperatures were collected in a sorghum (<i>Sorghum bicolor</i>) field as part of an experimental campaign carried out in Barrax, Spain, during the 2010 summer growing season. Performance of the Simplified Two-Source Energy Balance (STSEB) model was …

Wastewater Reuse Effects on Soil Hydraulic Conductivity

2004

The wastewater total suspended solids (TSS) concentration effects on the saturated hydraulic conductivity, \iK\ds, of a clay and a loam soil were investigated on laboratory repacked soil cores by a constant head permeameter. Both municipal wastewater (MW) and artificial wastewater (AW) with different TSS concentrations were used, with the aim to evaluate, by comparison, the effects of biological activity. The development of a surface sealed layer was investigated in loam soil columns supplied with AW and equipped with water manometers at different depths to detect the hydraulic head gradient changes. In the loam soil, \iK\ds reduced to about 80% of the initial value after infiltration of 17…

Estimación mediante programación genética de los patrones del suelo humectantes para el riego por goteo

2012

Drip irrigation is considered as one of the most efficient irrigation systems. Knowledge of the soil wetted perimeter arising from infiltration of water from drippers is important in the design and management of efficient irrigation systems. To this aim, numerical models can represent a powerful tool to analyze the evolution of the wetting pattern during irrigation, in order to explore drip irrigation management strategies, to set up the duration of irrigation, and finally to optimize water use efficiency. This paper examines the potential of genetic programming (GP) in simulating wetting patterns of drip irrigation. First by considering 12 different soil textures of USDA–SCS soil texture t…

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…

Los híbridos de "Sideritis incana L." y "S. tragoriganum Lag"

1997

Se aportan datos sobre la circunscripción taxonómica de S. incana y S. tragoriganum, en relación con la identidad de sus híbridos. Se propone una nueva combinación, S. × murcica nothosubsp. stricta (Font Quer) M.B. Crespo & E. Laguna, y se describe un nuevo nototaxon, S. × murcica nothosubsp. mediovalentina M.B. Crespo & E. Laguna. Además, se aportan datos sobre la distribución y ecología de los táxones y nototáxones considerados, y se lectotipifica un nombre. Some data on the taxonomic circumscription of S. incana and S. tragoriganum are reported. Regarding their hybrids, the new nothotaxon S. × murcica nothosubsp. mediovalentina M.B. Crespo & E. Laguna is described, and the new combinatio…

An interpolation-based data fusion scheme for enhancing the resolution of thermal image sequences

2014

In several human activities, such as agriculture and forest management, the monitoring of radiometric surface temperature is key. In particular both high spatial resolution and high acquisition rate are desirable but, due to the hardware limitations, these two characteristics are not met by the same sensor. The fusion of remotely sensed data acquired by sensors with different spatial and temporal resolution is a profitable choice to face this issue. When the real-time requirement is relaxed, the data sequence can be processed as a whole, allowing to improve the final result. Within this framework, we propose a novel batch sharpening strategy, relying on interpolation, data fusion and Bayesi…

Mapping of the perigastric lymphatic network using indocyanine green fluorescence imaging and tissue marking dye in clinically advanced gastric cance…

2022

Abstract Background Using indocyanine green (ICG) fluorescence imaging and tissue marking dyes (TMDs), perigastric lymphatic mapping and their pathological correlation were examined to see whether ICG staining covers all metastatic lymph nodes (LNs) in advanced gastric cancer (AGC). Methods Patients with AGC who underwent open distal or total gastrectomy were enrolled. ICG was serially injected intraoperatively into the subserosa along the greater and lesser curvatures. Stomach specimens were examined under a near-infrared camera. ICG-stained LNs were named, excised, and tattooed with different colored TMDs to retrace the exact location after pathological examinations. Results A total of 68…

Coprinus dunarum (Dünen-Tintling) in Dünamünde Pastorat Wanderdüne bei Langesciem mit Korrespondenz

1929

Zeichnung von Dünen-Tintling und Korrespondenz zwischen F. E. Stoll und K. R. Kupfer (Rigaer Gesellschaft der Naturforscher): "Ein von mir das Wanderdüne bei Langesciem entdeckten, das Wissenschaft nochunbekanter Pilz, das in das von den Deutchen Geseltschaft für Pilzen herrausgegeben "Zeitschrift für Pilzen" beschreiben in einer Farbentahfel und zwei Schvartafeln abgebildetun damit das Wissenschaftlische Weltbekant gegeben werden soll. Die reprodukktieres Karten stellen sich auf ca 400 Lat,.... F. E. Stoll. Riga, im April 1929 - Der Naturforscher-Verein zu Riga hat für dem vorstehen den Zeck 100 Lat bewilligt sintern der Voraussetzung, das die erwähnten Tafeln asicht im "Korresponenzblatte…