granular late fall fert - need advice

Discussion in 'Fertilizer Application' started by americanlawn, Aug 29, 2011.

  1. fl-landscapes

    fl-landscapes LawnSite Silver Member
    Posts: 2,542

    from what i know turf will uptake nutrients and store as carbohydrates all the way to soil temps just above freezing. It utilizes it in more root groowth and less top growth due to the plants slowing the photosythesis down with low temps and less sunlight each day. once the ground freezes metobolism stops the plant goes dormant and wont uptake anything. So as long as "in the fall" doesnt mean frozen ground it will utilize npk.
     
  2. Ric

    Ric LawnSite Fanatic
    Posts: 11,956

    Smallaxe

    One of the big problems in the Green Industry is lack of understanding 8th grade plant Biology. Fertilizers are Minerals or inorganic elements that Plant convert to sugars that feed them. This process takes Energy which in the case of Plants is supplied by the sun in a process called photosynthesis.
     
  3. countryclublawnllc

    countryclublawnllc LawnSite Member
    Posts: 151

    Smallaxe

    Into the fall/winter season depending on location etc. the plant will still be photosynthesizing utilizing the suns energy. The energy that it converts from the sun and turns into usable sugars and storable carbohydrates will give it better winter hardiness, root growth, as well as enhancing spring greenup. A good study was done in the mid 80's out of Ohio State that showed the benefits of late fall feeding. As stated above the plant will take up energy either through the shoots or roots as fall progresses, up until close to frozen ground occurs. The later the fertilizing the more it would be preferred to use readily available nitrogen sources opposed. I have always had a good response from the ammonium sulfate products later in the fall or early in the spring but if soil temps are still decent urea would be a cheaper source and still very effective. Here's a link to an article that summarizes the study:

    http://turfdisease.osu.edu/turf-disease-updates/benefits-late-fall-fertilization

    John
     
  4. Ric

    Ric LawnSite Fanatic
    Posts: 11,956


    John

    Very Nice study, But it actually answers Larry's original question of what to use. It also answers when to Use it. It does not answer Smallaxe's question about Plants needing sun to Metabolize Fertilizer. AS hard as it is to believe someone would ask that question. Not being a cool season guy this is only interesting trivia to me. But it does show my post to Riggle about not using slow release was wrong, My bad. I will admit I find Ammonium Sulfate gives a better color and response to turf than urea. However I also find urea formaldehyde (Blue Chip) give a even deeper dark Blue Green than any other Nitrogen source. Of course you pay for it.
     
  5. americanlawn

    americanlawn LawnSite Fanatic
    from midwest
    Posts: 5,852

    Thanks Barry, you are certainly correct. I posted this to see if folks were paying attention, but you saw right through it. Who applies aluminum? :laugh: ("ammonium" sulfate would have been closer to the fact).

    While ammonium sulfate may be beneficial during the early spring to give turf a "kick", it's kinda a waste of money during fall & late fall in the upper Midwest IMO.

    Granular vs prilled: both can be spread. Prilled is a higher quality/more expensive product. I remember seeing granular urea for just $6.00 per 50 pound bag in the mid 80's.

    I prefer some slow release N before winter, cuz even during heavy snow cover, the 4 inch soil temp often stays above 32 degrees. Rhizomes of Kentucky bluegrass can still be somewhat active during even the coldest of winters depending upon several factors (soil type, soil temps, sun exposure, etc, etc).

    Iowa State University (not the University of Iowa) has done very extensive research regarding the use, formulation, rates, and timing of nitrogen application. We try to keep in tune regarding their studies. I also appreciate the input we receive from Agrium, Pro-AP, and a couple others. (all are lawnsite.com sponsors)


     
  6. americanlawn

    americanlawn LawnSite Fanatic
    from midwest
    Posts: 5,852

    Nice link. I agree. :waving:

     
  7. fl-landscapes

    fl-landscapes LawnSite Silver Member
    Posts: 2,542

    Posted via Mobile Device
     
  8. fl-landscapes

    fl-landscapes LawnSite Silver Member
    Posts: 2,542

    Phew....thought your computer was hijacked or you lost your marbles........most of us discussed issues with fall fertilizing so it served a purpose beyond the gag it was meant to be anyhow.
    Posted via Mobile Device
     
  9. Ric

    Ric LawnSite Fanatic
    Posts: 11,956



    Larry

    I am not so sure Slow Dog was the only one to spot the stupidity. The Grub thread sure didn't do a lot for your credibility. My question about your possible problems from Pesticide poisoning (Dursban Twitch, etc) was Real. It comes from following your post over several years.


    ..
     
  10. americanlawn

    americanlawn LawnSite Fanatic
    from midwest
    Posts: 5,852

    Hey - you were the only one to suggest that "nutrients" provided grub control. I figured you were kidding -- then I realized you were trying to throw a fast ball like I did, except your "fastball"l was slower than mine.....gotcha ya. :laugh:
     

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