This site is supported by the advertisements on it, please disable your AdBlocker so we can continue to provide you with the quality content you expect.
  1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.
  2. Unfortunately for Photobucket users, things have changed in a big way as of June 26th they are rolling out a $399 per year subscription fee for those who want to hotlink images from Photobucket’s servers to display elsewhere.
    This does not mean it only affects this site, It now means that billions of images across the Web now display an error message instead of the image in question. :(
    https://barrreport.com/threads/attention-photobucket-users.14377/
    Dismiss Notice

Understanding EI's estimation, the math

Discussion in 'Articles' started by Tom Barr, Sep 29, 2005.

  1. Tom Barr

    Tom Barr Founder
    Staff Member Administrator Social Group Admin

    Joined:
    Jan 23, 2005
    Messages:
    18,462
    Likes Received:
    328
    Barak offers a good explaination of uptake measurements and the math associated with the theory behind EI.

    http://www.soils.wisc.edu/~barak/soilscience626/mm3.htm

    Plants can take up and store these nutrients in their vacoules over time. This allows plants to grow well in non stable systems in terms of nutrient supply.

    Many aquarist assume that aquatic plants prefer and exist in stable systems.
    Even if these systems are provided and great care is spent on maintaining a residual level of a nutrient, the levels can vary greatly over a short time frame in an aquarium.

    These levels are moving targets.
    When aquarist test these relationships, they need to test at small time intervals to see what type of curve is expressed, such as in the above example. Seldom are these relations a linear line in uptake.

    One or two measurements do not tell you much and do not allow you to predict future uptake, thus predict or estimate the future dosing routine.

    Plants also possess dual and multiple enzymes that are very good at taking in larger high concentrations of nutrients when abundant, and have very efficicent low level uptake enzymes when the nutrients in limiting and at a low concentration.

    This is why we can see plants doing well in a wide variety of systems.

    But the issue for EI is that it mitigates the need for testing by estimating the needs of the plants. Given plants ability to modulate their uptake capacity and rate, little is gained by attempting to finely focus on one particular level or uptake rate.

    The rate changes through time and with respect to the storage of the luxury consumption.

    Regards,
    Tom Barr
     
Loading...

Share This Page