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calibration of spreader

Discussion in 'Pesticide & Herbicide Application' started by RigglePLC, Mar 14, 2009.

  1. RigglePLC

    RigglePLC LawnSite Fanatic
    Messages: 13,724

    Does fertilizer spread faster and flow quicker if the humidity is low? The flow of my Barricade product was great today. While spreading with my Permagreen Ultra, I think I had to reduce the control dial to a lower setting, just due to dry weather. I found I must apply 50 pounds in just over 3 minutes and 40 seconds. Irregular, but once I ran out only 10 seconds too soon.

    Also--is there any difference in flow rate if the spreader is full, as compared to half, or a quarter full? I hope not; calibration would be a whole new ball game.
  2. Think Green

    Think Green LawnSite Silver Member
    Messages: 2,746

    Humidity affects the coatings on the herbicide combination products. It pulls the moisture from the air and makes the product behave differently. Products like 13/13/13 and urea will start to melt almost instantly inside a hot hopper in high humidity. If it is drier outside, the product will not clump or stick. High humidity will cause sticking and slower application. I will call this a common sense action with certain fertilizers being sulfur coated, plasticoated. Quick release nitrates will behave differently under excessive moisture conditions.

    I applied 34/0/0 to my 2 acres the other day. It was 78 degrees with about 15% humidity. My hopper holds 100 lbs. The stuff was getting sticky inside the hopper as I was walking. The weight of the fertilizer, and while bumping around on ruts, made the material pack inside the hopper. I did apply less per acre than calculated for. After the 2 acres were done, I had 10 lbs left over...... The hopper was stickier than before....
    Moisture affects paints.........?
    Moisture affects sand........?
    I will think a little harder and respond later..

    Excellent topic Riggle.
  3. Think Green

    Think Green LawnSite Silver Member
    Messages: 2,746

    Needless to say Riggle, I underapplied fertilizer to my pasture.................
    My spreader isn't adequate enough maybe....
    I have had better results from those cheap ole' Scott's push models..??
    Paid 200.00 for this model and the aperature gets clogged too easily.
  4. grassman177

    grassman177 LawnSite Fanatic
    Messages: 9,795

    oh yeah, especially when spreading grub control. some brands are notorious for being sticky. we always have to trun our spreaders up a notch or two and clean them out several times per day. nothing else seems to affect the rate like that one. wehave found a cleaner products and dont have much problem anymore but always look for the problem to occur
  5. Jason Rose

    Jason Rose LawnSite Fanatic
    Messages: 5,858

    Yes, definately. I don't fertilizer full time, but I do enough, lol. I notice the difference between a humid day and dry days too. On humid days even 'clean' fertilizer cakes up on the spinner plate. Yesterday I went through 25 bags and there was barely anything on there at all, all day.

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