Dualex 4 Scientific (Dx4)

Title Dualex 4 Scientific (Dx4)Title (native language)

Category Recording or mapping technology

Short summary forpractitioners (Practiceabstract) in English)

We have characterized a new commercial chlorophyll (Chl) and flavonoid (Flav) meter called Dualex 4Scientific (Dx4). We compared this device to two other Chl meters, the SPAD-502 and the CCM-200. Inaddition, Dx4 was compared to the leaf-clip Dualex 3 that measures only epidermal Flav. Dx4 isfactory-calibrated to provide a linear response to increasing leaf Chl content in units of μg cm–2, asopposed to both SPAD-502 and CCM-200 that have a non-linear response to leaf Chl content. Ourcomparative calibration by Chl extraction confirmed these responses. It seems that the linearresponse of Dx4 derives from the use of 710 nm as the sampling wavelength for transmittance. Themajor advantage of Dx4 is its simultaneous assessment of Chl and Flav on the same leaf spot. Thisallows the generation of the nitrogen balance index (NBI) used for crop surveys and nitrogen nutritionmanagement. The Dx4 leaf clip, that incorporates a GPS receiver, can be useful for non-destructiveestimation of leaf Chl and Flav contents for ecophysiological research and ground truthing of remotesensing of vegetation. In this work, we also propose a consensus equation for the transformation ofSPAD units into leaf Chl content, for general use.

Short summary forpractitionersWebsiteAudiovisual materialLinks to other websitesAdditional commentsKeywords Farming equipment and machinery | Plant production and horticultureAdditional keywordsGeographical location(NUTS) EU

Other geographicallocationCropping systemsField operations Crop and soil scoutingSFT users Farmer | Contractor

Education level of users Primary education | Secondary education | Apprenticeship or technical school education | Universityeducation

Farm size (ha) 0-2 | 2-10 | 10-50 | 50-100 | 100-200 | 200-500 | >500

Scientific article

Title A new optical leaf-clip meter for simultaneous non-destructive assessment of leaf chlorophyll andepidermal flavonoids

Full citation Cerovic, Z.G.; Masdoumier, G.; Ghozlen, N.B.; Latouche, G. (2012). Physiologia Plantarum,DOI:10.1111/j.1399-3054.2012.01639.x

Effects of this SFTProductivity (crop yield per ha) Some increaseQuality of product No effectRevenue profit farm income Some increaseSoil biodiversity No effectBiodiversity (other than soil) No effectInput costs No effectVariable costs No effectPost-harvest crop wastage No effectEnergy use No effectCH4 (methane) emission No effectCO2 (carbon dioxide) emission No effectN2O (nitrous oxide) emission No effectNH3 (ammonia) emission No effectNO3 (nitrate) leaching No effectFertilizer use Some decreasePesticide use No effectIrrigation water use No effectLabor time No effectStress or fatigue for farmer Some decreaseAmount of heavy physical labour No effectNumber and/or severity of personal injury accidents No effectNumber and/or severity of accidents resulting in spills property damage incorrectapplication of fertiliser/pesticides etc. Some decrease

Pesticide residue on product No effectWeed pressure No effectPest pressure (insects etc.) No effectDisease pressure (bacterial fungal viral etc.) No effect

Information related to how easy it is to start using the SFTThis SFT replaces a tool or technology that is currently used. The SFT is better than thecurrent tool agree

The SFT can be used without making major changes to the existing system no opinionThe SFT does not require significant learning before the farmer can use it disagreeThe SFT can be used in other useful ways than intended by the inventor no opinionThe SFT has effects that can be directly observed by the farmer disagreeUsing the SFT requires a large time investment by farmer no opinionThe SFT produces information that can be interpreted directly disagree

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This factsheet was generated on 2018-Apr-03 11:57:17.