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does fertilizer go bad?

Discussion in 'Fertilizer Application' started by sirsweatsalot, Oct 18, 2002.

  1. sirsweatsalot

    sirsweatsalot LawnSite Senior Member
    from MN
    Messages: 296

    is there a length of time you have before your dry or wet fertilizer goes bad?
  2. KLMlawn

    KLMlawn LawnSite Senior Member
    Messages: 443

    Dry- Yes, when it gets enough moisture adhereing to it to become wet and useless.
    Liquid, I am not sure .... never kept any around long enough to know.
  3. f350

    f350 Banned
    from mi
    Messages: 424

    liquids go bad, really fast in the heat. it amoniates ( something like that )
  4. tremor

    tremor LawnSite Bronze Member
    Messages: 1,476

    Properly stored dry bulk blended fertilizer doesn't go bad. Store bags as high as possible preferably over a vapor barrier that's got a few pallets stacked on it at the least. Clumpy blends are a bother to break up & screen, but they'll still be "good".

    Ammoniated (homogeneous) fertilizers have a shelf life. I'm not exactly sure how long it is though as I recall, the analysis will have something to do with it. 1 year is about the beginning of the end I think. After that, the slow release content & analysis will begin to change to some extent.

    Triazone based liquids are pretty stable in storage. I have a bottle of 18-3-6 50% N-Sure that I finally tapped this summer. I've had it for 5 years. It's still fine.

    Any fert that is already diluted in water is subject to rapid degradation. When it's hot, Urea based liquids will last only a day or two in the tank. To be sure, use a Ph test strip. The Ph of the mix will quickly climb up to the 9's in the summer. This can be corrected with Phosphouric acid to bring it back down, but this is expensive & dangerous. Acid must be very slowly added or the mix will boil. I once watched a guy get knocked off his tanker by a violent boil over reaction. Had he not been wearing a full face shield & apron, he'd have been burned & blinded.

    Just make sure liquids are completely use up at the end of the day.

    Store granular ferts high, cool, & dry.

  5. robert payer

    robert payer LawnSite Senior Member
    Messages: 282

    With paper blend bags, if the bottom of the bag is damp or wet the active ingredient has released. I would think twice before using it where you demand proper results.

    I had once put down some slow release fertilizer that had been damp. In 7 days that yard was a jungle. Lucky it was spring! Summer would have spelled death!

    Use it where the poor results could slide if you are in doubt.

    Ones reputation, word and can do ability is very valuable when it comes to servicing customers.

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