Use a DIY test kit, https://a.co/d/2m594ui they sell them for pretty cheap on Amazon. It looks like it could be.. A good start is testing your pH, make sure your moisture level is consistent too. A constant fluctuation can cause this. Or you can always send it to a lab to get it tested for sodium and nitrogen measurements etc
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Use a DIY test kit, https://a.co/d/2m594ui they sell them for pretty cheap on Amazon. It looks like it could be.. A good start is testing your pH, make sure your moisture level is consistent too. A constant fluctuation can cause this. Or you can always send it to a lab to get it tested for sodium and nitrogen measurements etc