Abstract
Abstract Plug transplants were developed in the Pacific Northwest as a way to accelerate nursery production and increase root system fibrousness of barefoot seedlings, and the practice has been spreading to other areas. This paper describes a trial of its use in a do: Southwestern area. Ponderosa pine (Pinus ponderosa var. scopulorum Engelm.) seed was sown in February in small containers, transplanted to outdoor nursery beds at Albuquerque NM in May, lifted the following February, and outplanted as plug+1 stock in April. Survival was as good (76 and 71%) and growth better (232 vs. 209 mm) than standard 2+0 stock after 3 yr. A similar regime for Engelmann spruce (Picea engelmannii (Parry) Engelm.) produced seedlings that survived and grew well (survival 86 and 94%, height growth 54 and 56 mm for plug+2 and standard stock, respectively), but they required 2 yr in the nursery bed (plug+2) to reach adequate size for transplanting, which negated the advantage of reduced production time. West. J. Appl. For. 11(3):81-84.
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