Quote:
Originally Posted by isurus79
We were above 100 degrees for 51 days this summer and the pellets worked very well. I've still got plenty in my pots right now.
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A couple of comments here:
Air temperature does not necessarily translate to pot temperature, especially if they're wet and evaporative cooling can occur.
Having the pellets present doesn't mean they are still releasing fertilizer, as they don't work by slowly dissolving.
Instead, they consist of a permeable polymer pellet containing water-soluble fertilizer. Once the pellet has absorbed water, fertilizer solution starts to ooze out. The rate at which it is released is determined by the porosity of the polymer, and as the polymer has a thermal expansion coefficient, the warmer the pellet, the larger the pores and the faster the fertilizer is released. Different release rates are controlled by modifying the polymer and its thickness.
Your remaining pellets
might be just plastic shells.
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