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Leaf Area Options for the LI-6800

Leaf Area Options for the LI-6800

New leaf area options for the LI-6800 Portable Photosynthesis System are available. Measurable leaf areas ranging from 2 cm2 all the way to 36 cm2 mean you can take measurements on leaves of nearly any shape and size.

An accurate measure of leaf area is an important parameter for calculating assimilation rate. If the area of the chamber occupied by the leaf completely covers the aperture, the leaf area calculation is simple — for example, with the 3×3 cm aperture, the measurable…

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Changing Seasons With Your Photosynthesis System: Tips and Tricks

Changing Seasons With Your Photosynthesis System: Tips and Tricks

As the seasons change, it’s always a good practice to give your instrumentation some much-needed attention and routine maintenance. Below is a list of tips to help you get your LI-6800 or LI-6400/XT photosynthesis system ready for a new season of measurements.

LI-6800 Portable Photosynthesis System

  • Check your software version(s) and update to the latest instrument software, if necessary.
  • Check when the instrument was last factory-calibrated, noting the recommended frequency.
  • Check and replace the console air filter…

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Resolving a Leak Issue With the LI-6800

Resolving a Leak Issue With the LI-6800

Leaks will get your attention by causing a leak/flow test failure (Start Up->Warmup/System Tests), low ‘Flow’ reading (mass flow to chamber in the diagram), low ‘Flow_s’ or ’Flow_r’ reading (flow through the sample/reference gas analyzer). The following three warning messages may appear on the upper left corner of the display: ‘Console flow leak?’, ‘Flow_s low’, ‘Flow_r low’ (see Table 5-2 on the page 5-4 of the LI-6800 manual for more details).

  1. If you can achieve ‘Flow’ setpoint, but…

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Connecting a Soil Moisture Probe to the LI-6400XT

Connecting a Soil Moisture Probe to the LI-6400XT

The LI-6400XT Portable Photosynthesis System can record data from auxiliary sensors, such as soil moisture probes, through its 37-pin connector. Any soil moisture probe can be connected, as long as it provides analog voltage outputs. Frequency, SDI-12, or RS-485 sensors will not work with the LI-6400XT. In this example we will connect a Decagon EC-5 soil moisture sensor.

Hardware Configuration

Connect the soil moisture probe to the 37-pin connector kit (part number 9964-035). This may require soldering. The connector kit…

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Software for Fitting Photosynthetic CO2 or Light Response Curves

Software for Fitting Photosynthetic CO2 or Light Response Curves

A frequent question from LI-COR LI-6400XT users is a request for software resources for fitting the Farquhar, von Caemmerer and Berry (FvCB) model of photosynthesis (Farquhar, von Caemmerer & Berry 1980).  There is a wealth of literature on this topic and a variety of methods developed to fit the model.  There are currently no commercial software packages available for this purpose. Several software packages are, however, freely available for fitting the FvCB model of photosynthesis. Some approaches use only gas…

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