Which Fall Fertilizer Should I Use?

Discussion in 'Fertilizer Application' started by joed, Sep 7, 2012.

  1. lawn2012start

    lawn2012start LawnSite Member
    Posts: 58

    ok. I thank you guys for all your help.
     
  2. Smallaxe

    Smallaxe LawnSite Fanatic
    Posts: 10,081

    They say that Potassium is NOT, leached from the soil and may build up to high levels???

    That would be interesting to know... They've recently shifted the the idea that P doesn't leach,,, yet now they are highlighting the conditions in which there may be some leaching...

    So it would be interesting to know, How, they tested this idea, and whether it is a reliable experiment... so much about fertilizers and pesticides have become politicized that it isn't safe to know anything for sure...
     
  3. lawn2012start

    lawn2012start LawnSite Member
    Posts: 58

    yes so much stuff has become politicized and the common knowledge amoungst many is not the way to do thing.
     
  4. maynardGkeynes

    maynardGkeynes LawnSite Senior Member
    Posts: 409

    Not sure if I follow all the back and forth here, but the reason I understand that there is a push to eliminate P is that it does leach into the water supply, although there is a debate about how much of a factor lawns are in the problem. I think the feeling is that since mature turf has very low P needs, a lot of P was being dumped on lawns unnecessarily by including it by default in popular fertilizers, like Scotts Turf Builder. Now, you more or less have to ask for it, by specifically going for "starter" fertilizer. BTW, it's almost impossible to eliminate P from so called "organic/natural" fertilizers, which have really begun to take market share from Scotts and other mass market fert guys. Call me a cynic, but that just may explain why Scotts has now jumped so enthusiastically behind efforts to restrict P.
     
  5. Smallaxe

    Smallaxe LawnSite Fanatic
    Posts: 10,081

    The thing about P has been around for a few years now, but this is the first that I heard K(potassium) doesn't leach from the soil... is that True???
     
  6. turfmd101

    turfmd101 LawnSite Bronze Member
    Posts: 1,268

    In Florida, under normal rain fall. K won't last more than 10-12 days. The biggest dictator is the soils CEC. Depends on percentage of sand and clay mix. The more clay. The higher the CEC.
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  7. lawn2012start

    lawn2012start LawnSite Member
    Posts: 58

    so K doesnt hold as well in clay or it does better?
     
  8. turfmd101

    turfmd101 LawnSite Bronze Member
    Posts: 1,268

    I believe the higher the cation-exchange capacity. The better the nutrient holding capacity. Clay is high. Sand is low. Then the CEC is based on % of sand to clay ratio. K also leave salt in the soil. Based on these factors. Salt from K can aid in minimizing certain weed species. Not a huge help.... but it will aid.
    Posted via Mobile Device
     
  9. Smallaxe

    Smallaxe LawnSite Fanatic
    Posts: 10,081

    CEC is the determinant in accessibility for nutrients to plants... P is bound to everything as far as I understand it, and under normal circumstances, will not get into the water short of the soil it is bound to, itself, going into the water...

    So the difference in leachablility in K: Is it like N which is lost over time when not used in the soil, or is it like P, that needs to be mined from the soil by specialized AM Fungi???

    If K is only held to CE sites, like N, then my guess is that it is leachable... :)
     
  10. turfmd101

    turfmd101 LawnSite Bronze Member
    Posts: 1,268

    I consider K the most volatile. Unless it's sulfur coated.
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