UNDERSTANDING % OF SCU OF AN FERTILIZER ANALYSIS

Discussion in 'Lawn Mowing' started by ant, Oct 21, 2000.

  1. ant

    ant LawnSite Silver Member
    Posts: 2,444

    i looked at a bag of 32-5-7 25% scu (#007532)
    on the label it read "7.20% slowly available nitrogen from lesco poly plus sulfer coated urea" were do they get 25% scu at?
    anthony
     
  2. Prime Seasons

    Prime Seasons LawnSite Member
    Posts: 57

    Anthony:

    I believe it is something like this:

    Lesco 32-5-7 has N breakdown of 30.1% urea, 1.1% Ammoniacal = 32% total. The scu is their trade mark poly coated scu (sulfur coated urea. Basically, this means an extended release of N to the lawn, ie a more steady & longer growth response.

    $.02 worth

    gus
     
  3. ant

    ant LawnSite Silver Member
    Posts: 2,444

    gus: i understand what you are saying but,off the label were do they get 25% scu?
     
  4. The product contains 30% urea.

    7.2% of that urea is coated.
     
  5. GroundKprs

    GroundKprs LawnSite Bronze Member
    Posts: 1,969

    Agree with Stone: 25% of N is SCU. Not only do you have to read the label, you have to analyze it, too. ;)
     
  6. powerreel

    powerreel Banned
    Posts: 481

    Poly coated SCU isn't SCU. It is called POLYMER COATED SULFER COATED UREA, sulfer coated urea and polymer coated sulfer coated urea are two entirely different things. Poly coated SCU is SCU with a Polymer sprayed over Sulfer coated urea, hence two different release vehicles.
     
  7. Prime Seasons

    Prime Seasons LawnSite Member
    Posts: 57

    powerreel:

    Thanks for the clarification. I wrote the post fast-- my words did not convey what I was trying to communicate.

    gus
     
  8. morturf

    morturf LawnSite Senior Member
    from midwest
    Posts: 475

    regardless of the vehicle (pscu, scu, mbdu, ibdu) the label always says how much of the N is slowly available, then states the #'s of N slowly available too.

    the analysis works like this:


    35-5-7 (25% scu)
    lets say you have 100#s of product.
    35#'s is nitrogen
    5#'s is phosphorus
    7#'s is potassium
    right.


    of the 35#'s of nitrogen 25% of the 35#'s is scu meaning that
    7.20#'s is scu. when you do the math it comes out to 8.75#s but with the percentage of N from the scu is also a variable. It is a little deceiveing for the companies to do this but they all do it this way.
     
  9. powerreel

    powerreel Banned
    Posts: 481

    35+5+7=47 where's the rest?
     
  10. morturf

    morturf LawnSite Senior Member
    from midwest
    Posts: 475

    hen bits....cat litter.....filler. that is where the rest is. also there might be some traces in there, iron, sulfur. urea in straight form is only 46-0-0.
     

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