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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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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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Using the LI-6800 in Undergraduate Environments

Using the LI-6800 in Undergraduate Environments

Dr. Jason Kilgore, an associate professor of biology at Washington & Jefferson College, has been using top-notch research instrumentation to enhance undergraduate learning. As a member of the Ecological Research as Education Network (EREN), which is a collaborative network of schools that are primarily undergraduate institutions, Dr. Kilgore and other EREN faculty “use authentic research as a model for students to learn about biology.” He does so by incorporating an LI-6800 Portable Photosynthesis System into his coursework and student research.

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Setting the Proper Height of the 6400-04 Thermocouple

Setting the Proper Height of the 6400-04 Thermocouple

The 6400-04 thermocouple position generally needs to be high enough to touch the leaf with the fine-wire thermocouple, as seen in the figure below.

6400_thermocouple

If the thermocouple is not positioned high enough, the thermocouple will measure air temperature in the chamber rather than leaf temperature. If the thermocouple is too high, the leaf can put pressure on the flexible supporting hoop.  This pressure may tear or puncture delicate leaves or…

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