Apply fungicides at early bloom and repeat at full bloom. This will insure that you get the fruit at its optimal ripeness and minimize the spread of Botrytis. At this stage the berries will have higher sugars but reduced shelf life and are best suited for local markets. Spread uniformly across the row or side dress with half on each side of row in a 3 foot wide band. If using a split application, apply the first portion at bud break and the remainder just after harvest.
Ammonium nitrate is the most common form of N used on blackberries.
The incorporation of P and K should be based on soil test recommendations, see table below. Click here to return to the BerryInfo page.