Storing polyphosphates


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Not only has the weather this spring affected farmers’ ability to get crops in the ground, but it has also created situations where ag suppliers have products that did not make it to the field for application. A common question is, how do I manage my storage of polyphosphates?

Here are a few things to remember when managing your storage:

  • Store polyphosphates in lighter colored storage containers. That will help keep product temperature down compared to darker storage containers.
  • Do not agitate or circulate your polyphosphates when air/product temperatures are high. This can actually increase the temperature of the solution.
  • Monitor degradation of polyphosphates to help with management decisions.
    • Ideally, samples should be collected from the top, middle, and bottom of the container.
    • Once samples are collected, refrigerate them immediately.
    • Samples should be shipped overnight to determine orthophosphate content (do not use two- or three-day shipping — that can allow the sample to get too warm). Ideally, samples should be shipped cool in an insulated container.
  • If the analysis reveals the polyphosphate concentration is approaching 60 percent (orthophosphate is approaching 40 percent), add fresh polyphosphate to the container. If the analysis reveals polyphosphate concentration is approaching 65 percent, ordering additional polyphosphate (to be added to the container) is recommended before the concentration of polyphosphate gets too low.

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