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This week the plants unfortunately got an extra feed of PK by Rhi causing pretty bad nutrient burn. We had to flush them twice to remove the excess nutrients, this was around the 14th Oct - tested the run off and it came out as this:
#1 - required 4.8L to flush it - 1120ppm - pH 6
#2 - 4.5L - 1670ppm - pH 5.8
#3 - 3.5L - 605ppm - pH 6.3
#4 - 3.5L - 552ppm - pH 6.4
#1&2 are in plastic pots and they take a lot longer to absorb water and nutrients compared to #3&4 which are growing in airpots so the nutrient burn showed up quickly and was quite a bit worse on the plants in airpots..