December 14, 2020
By By Dr. Barry J. Shelp, Edward J. Flaherty, William J. Sutton, Skye Duncan Stephens, Alyna J. Donetz, Lou M. Schenck And Jamie Aalbers
Reduced nitrogen, phosphorus and potassium inputs lead to quality chrysanthemums.
December 14, 2020
By By Dr. Barry J. Shelp, Edward J. Flaherty, William J. Sutton, Skye Duncan Stephens, Alyna J. Donetz, Lou M. Schenck And Jamie Aalbers
Figure 1. Chrysanthemums were tested using three N/P/K delivery regimens. This photo shows 75V plants (75/22/75 up to bud break, followed by potable water for the remainder of the crop cycle).
Closed subirrigation systems are popular in indoor floricultural production because they reduce nutrient usage and the risks of contaminating water resources with nitrogen (N), phosphorus (P), boron and molybdenum. However, the recirculated nutrient solution must be refreshed occasionally and eventually discharged or treated in accordance with applicable environmental legislation. Consequently, it is likely better to reduce nutrient delivery where possible so that even less fertilizer is used.