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Substituted Tertiary Amine Plant Bioregulators Affect Yield and Pigment Content of Paprika

Abstract Research over the last two decades indicated that a class of plant bioregulators known collectively as substituted tertiary amines (STA) has the potential to increase crop productivity by increasing root growth, photosynthetic efficiency, and overall plant vigor. Although several in vitro and greenhouse studies have been conducted with these materials, few have investigated the efficacy of STA application in commercial production systems. This study was initiated to determine whether STA application on commercially grown paprika (Capsicum annuum L.) would increase yield and pigment content. Plots were established in producer fields during the 1997 and 1998 growing seasons. Foliar spray treatments of 2-(3,4-dichlorophenoxy) triethylamine (DCPTA) as well as diethyl-2-(4-methylbenzoxy) ethylamine (MBTA) at concentrations of 0,5,7,10, and 15 mg·L-1 were applied to seedlings in 1997 and foliar spray treatments of MBTA at 0, 7, and 10 mg·L-1 were applied to seedlings in 1998. Nested treatments of a plant growth enhancer (PGE) were also applied in 1998. The 7 mg·L-1 MBTA treatment resulted in a 822.2 kg·ha-1 (23.2%) yield increase in 1997 and in a 670.0 kg·ha-1 (27.7%) yield increase in 1998 over untreated controls. The 7 mg·L-1 DCPTA treatments resulted in a 565.6 kg·ha-1 (15.9%) yield increase over untreated controls in 1997. The 1998 PGE treatment resulted in an average 330 kg·ha-1 (12.8%) yield increase. Fruit pigment content was also improved significantly (p < 0.05) by certain STA treatments. STA application appears to be efficacious in commercial production paprika.