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from Grower Talks

Plant growth regulators (PGRs) to produce uniform, compact plants in greenhouses is common practice in the floriculture industry. The primary benefit of PGRs is to control excessive growth allowing tighter spacing and increased yield per growing area. A variety of methods are utilized to apply PGRs, including liner soaks, bulb dips, foliar sprays, spike applications and substrate drenches. One of the most popular application methods are substrate drenches. A drawback of drench applications is the potential adsorption of active ingredient by organic substrate components. Aside from vermiculite and perlite, most of the substrate components used today are comprised of organic materials. For this reason, many researchers have examined PGR efficacy in a range of horticultural substrates, notably pine bark (aged or composted), rice hulls and coconut coir. more

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