Abstract
Subirrigation systems are popular for reducing nutrient usage in indoor floricultural production. Two open subirrigation experiments were conducted in a commercial setting using multiple chrysanthemum cultivars and up to 75% less N–P–K than industry standards. The lowest N–P–K levels supplied in the nutrient solution (in mmol·L−1: 5.4 N, 0.71−0.97 P, 1.9−4.1 K) up to bud break, were associated with acceptable leaf N–P–K levels [4.5−5.4% dry matter (DM), 0.23−0.60% DM, and 3.3−5.6% DM, respectively]. These findings validate our modified delivery practice and the use of lower N–P–K inputs in the production of subirrigated pot chrysanthemums.
Highlights
Chrysanthemums were tested in a commercial setting over multiple years using different N/P/K delivery regimens
B. Schenck #2 used (in mmol L−1): 7.1VR ≡ 7.1/0.94/2.6 over the entire crop cycle; 7.1V ≡ 7.1/0.94/2.6 up to bud break, followed by potable water during the remainder of the crop cycle; and 5.4V ≡ 5.4/0.71/1.9 up to bud break, followed by potable water during the reminder of the crop cycle
Summary
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