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Humic Acid and water retention study

Discussion in 'Organic Lawn Care' started by JoJo1990, May 1, 2012.

  1. JoJo1990

    JoJo1990 LawnSite Member
    Posts: 244

    I found this very interesting. Although the trial was on a putting green, it goes against most claims of humates increasing the water holding capacity in soils. Here is an excerpt from a summary for those that don't care to read peer reviewed articles... "...Humic substances did not increase moisture retention in
    putting green soils as pure humic acid significantly
    decreased soil volumetric water content compared to the
    control. Both humic acid- and fulvic acid-treated plots had
    lower soil moisture content readings than the control at a
    depth of 10 to 15 cm during the growing season." -USGA 02-15-09

  2. Kiril

    Kiril LawnSite Fanatic
    Posts: 18,308

    USGA Turfgrass and Environmental Research Online is not a peer reviewed journal.
  3. mdlwn1

    mdlwn1 LawnSite Silver Member
    Posts: 2,443

    Does this trial contemplate the effects beyond actual water retention?...as in does a healthy stand of turf actually require less water retention. I had really bad dry spots untill i began to correct my potassium issues.....same amount of water, but now i have comparatively extreme drought resistance. Just posing a realistic application, I have no interest in this study as my own results are enough for me.
  4. JoJo1990

    JoJo1990 LawnSite Member
    Posts: 244

    Correct. This article was improperly placed in a batch of available online peer reviewed journal articles. The USGA does have online peer reviewed articles available, however.

    Mdlwn1: This study was only on a sand based golf course putting green. Although it would be geared for the golf world, it may have some impacts if an LCO was dealing with a very high sand content soil base. There are lots of studies that show very different results in a loam or clay soil structure. I simply found this article interesting because my initial thought was that it would in fact increase the water retention and holding capacity of the sandy soil. I wonder if a prolonged study would change the results.

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