From this month’s Greenhouse Product News:
I’ve noticed an increasing trend in the use of sprench applications of plant growth retardants (PGRs), especially by large-scale commercial growers. A sprench is a hybrid of a spray and a drench application; it is applied overhead either as a high-volume spray (usually by booms) or lightly watered-in with a hose. The PGR solution is applied so that the shoots are covered and a modest amount penetrates the surface of the growing media. While sprays are typically applied at a volume of 2 to 3 quarts per 100 square feet, sprenches are roughly three times that volume, or 6 to 8 quarts per 100 square feet… Why do sprench applications seem to be gaining in popularity?