A four nation survey of farm information management and advanced farming systems: A descriptive analysis of survey responses   总被引：1，自引：0，他引：1  

Lartey G. Lawson  Søren Marcus PedersenClaus Grøn Sørensen  Liisa PesonenSpyros Fountas  Armin WernerFrank W. Oudshoorn  Luzia HeroldThanos Chatzinikos  Inger Marie KirketerpSimon Blackmore 《Computers and Electronics in Agriculture》2011,77(1):7-20

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Evaluation of the use of LIDAR laser scanner to map pruning wood in vineyards and its potential for management zones delineation     

A.?C.?TagarakisEmail author  S.?Koundouras  S.?Fountas  T.?Gemtos 《Precision Agriculture》2018,19(2):334-347

Vine vigour assessment has been a major concern of precision viticulture studies in order to identify areas of uniform vine performance within vineyards. Moreover, the counting and weighing of winter dormant canes is considered as the most informative measurement to indicate vine balance and is commonly performed manually by grape growers for management purposes. The main concern of this measurement is that it is time consuming and laborious and it cannot accommodate detailed sampling density. In the present study, the potential of using laser scanner technology as an automated, easy and rapid way to perform mapping of the winter pruning wood across the vineyard was investigated. The study was conducted during 2010 and 2011, in a one hectare commercial vineyard in central Greece, planted with cv. Agiorgitiko, a traditional Greek variety for the production of red wine. Parameters of topography, soil depth, soil texture, canopy properties (NDVI), yield, and grape quality were mapped and analysed in conjunction to winter canes weighing at pruning time. The mapping of the dormant canes was carried out using a 2D laser scanner sensor prior to pruning and manually measuring the pruning weight on a 10 × 20 m grid. Laser scanner measurements showed significant relationship in both 2010 and 2011 with pruning weight (r = 0.809 and r = 0.829 respectively, p < 0.001), yield and early season NDVI, showing the potential of using laser scanner measurements to assess variability in vine vigour within vineyards. These results suggest that laser scanners offer great promise to characterize within field variability in vine performance.  相似文献   

Potential Dissipation of Atrazine in the Soil Unsaturated Zone: a Comparative Study in Four European Countries     

Salah Issa  Martin Wood  Luc Pussemier  Vincent Vanderheyden  Catherine Douka  Spyros Vizantinopoulos  Zoltan Gyori  Maria Borbely  Janos Katai 《Pest management science》1997,50(2):99-103

A European-wide project has been undertaken to establish the potential for dissipation of atrazine in the soil subsurface environment. Samples were obtained, avoiding contamination, in four countries (Belgium, Greece, Hungary and UK) and laboratory studies carried out. In order to make comparisons between results from each laboratory, a ring experiment was carried out using common methodology for sampling, extraction and analytical techniques. Subsurface materials from each country were distributed to the other countries. Atrazine dissipation was determined in each country for all materials under the same laboratory conditions. The results of this comparative study showed generally good agreement between all laboratories. Significant potential microbiological dissipation was detected in certain samples. Where differences occurred between laboratories this was attributed to small, spatially heterogeneous microbial populations in the subsurface materials. © 1997 SCI.  相似文献   

Effect of fish farming on the water column nutrient concentration in a semi-enclosed gulf of the Eastern Mediterranean     

Nikos Neofitou  & Spyros Klaoudatos 《Aquaculture Research》2008,39(5):482-490

The spatial and seasonal impact of fish farming on the water column of two fish farms in the Eastern Mediterranean was investigated, between July 2004 and April 2005. In the area of each fish farm, three stations were sampled. One was located at the centre of the fish farm, the other at a distance of 50 m from the centre and the last one at a distance of 300 m from the fish farm centre. At each sampling station, water samples were collected at the surface, at 5 m and at every further 10‐m depth from the surface to the bottom, for nutrient analysis (ammonium, nitrite, nitrate, phosphate, silicate). Statistical analysis showed significant differences between seasons for all nutrients, with the exception of nitrite in one of the farms. Furthermore, ammonium, nitrite, phosphate and silicate values showed significant differences among sampling stations. The maximum concentrations of the above nutrients (1.64, 0.10, 2.57, 0.28 and 4.89 μM respectively) were recorded at the sampling stations located at the centre of each fish farm and they were gradually reduced with increasing distance from the cages. The concentrations of nutrients did not appear to exceed permitted levels for the appearance of eutrophication. The maximum concentrations were considerably lower than those observed previously in the study area.  相似文献