Hi Nerine,

My experience has been that anytime we use nitrates in blueberries, we get really poor results with fruit quality and disease and insect pressure. When I was more chemically focused, I used liquid ammonium sulfate if the pH was above 5.5, and liquid Urea if it was below 5.5. We would never use any nitrates at all. I’m pretty confident it’s a bad idea. There’s lots of literature on that too. I always added humic acid and molybdenum to the liquid nitrogen too. Now that most of my consulting in blueberries is in organic, we are using mostly fish now with biologicals and biostimulants with excellent results. Much better quality and disease and insect resistance, with no yield decreases vs conventional. Have you read @john.kempf ‘s blog on blueberries yet?