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Category: Area Meters

Researchers Measure Leaf Area Index in Grapevines with a Non-Invasive Method

Researchers Measure Leaf Area Index in Grapevines with a Non-Invasive Method

Nestled along Germany’s Rhine River in one of the world’s most distinguished wine regions, Geisenheim University has a particular mission for viticulture and enology research and education. Looking for an accurate, fast, non-destructive method for measuring leaf area index (LAI) in vineyards, Geisenheim scientists have been using the LAI-2200 Plant Canopy Analyzer from LI-COR Biosciences. Results were published in the American Journal of Enology and Viticulture (Döring et al., 2014).

Leaf Area Index and Viticulture

LAI, defined as the ratio…

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Area Meter Connectivity with Windows® 7

Area Meter Connectivity with Windows® 7

Some customers have inquired if the Windows® Interface Software that accompanies our area meters will work with Windows® 7.  Even though Microsoft® developed this operating system years after the LI-3000C Portable Area Meter and the LI-3100C Area Meter were launched, these two instruments still operate as usual with version 1.0.0 of their respective interface programs.

The instrument’s RS-232 connection functions normally as it did with Windows 98, 2000, XP, and Vista.  However, there are some steps necessary to allow USB connectivity…

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Using the LAI-2200 in Sunny Conditions

Using the LAI-2200 in Sunny Conditions

In a previous tech tip, we used digital photography to show how canopy gap fraction measurements can be over-estimated if measurements are taken when foliage is brightly lit (i.e. when measurements are taken in direct sunlight). The over-estimation of gap fraction leads to under-estimation of leaf area index (LAI), typically by about 10% or more. The underestimation of LAI depends on factors such as sun angle and leaf angle distribution. To avoid this, the LAI-2200 should ideally be used…

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Updated LAI-2000 File Viewer Software

Updated LAI-2000 File Viewer Software

LI-COR® Biosciences recently released an updated version of the software that is used with the LAI-2000 Plant Canopy Analyzer – the FV2000 software. FV2000 is a Windows® application for downloading, viewing, and manipulating data files from the LAI-2000. The FV2000 software provides added functionality, especially for visualizing and designing isolated canopy models, determining path lengths, and for general data graphing and analysis.

Version 1.11 of the Read More Read More

Appropriate Sky Conditions for Using the LAI-2000

Appropriate Sky Conditions for Using the LAI-2000

For users of the LAI-2000 Plant Canopy Analyzers, just a reminder that an overcast sky is the best condition in which to use the instrument.

Under cloudy skies, the contribution of scattered radiation is low; when the direct beam of the sun is shining on foliage, scattered radiation is significantly increased. The LAI-2000 optical sensor is filtered to reject radiation above 450 nm, which minimizes the influence of radiation scattered by the foliage. If scattered radiation is present, however, the…

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