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Advancing Greenhouse Establishment of Radish, Kale, and Amaranth Microgreens through Seed Treatments
Jung-Soo Lee,Wallace G. Pill 한국원예학회 2005 Horticulture, Environment, and Biotechnology Vol.46 No.6
Seed treatments to advance the establishment of radish (Raphanus sativus), kale (Brassica napus var. pabularia), and amaranth (Amaranthus tricolor) for greenhouse microgreen production were examined. Seeds were matrically primed in fine vermiculite at 12℃ and -1.0 ㎫ (by adding deionized water at 50% of the vermiculite dry weight; seed:vermiculite, 1:5, w/w) for 3 days, removed from the vermiculite, and dried to initial weight before sowing. While germination percentage was little affected, appreciable germination advancement in all species was achieved by the priming. In a greenhouse study, this treatment advanced seedling emergence of radish and kale compared to non-treated seed, but failed to increase shoot dry weight at 13 days after planting (DAP). Priming amaranth seed gave no emergence advantage but increased shoot dry weight by 41%. When seeds were germinated in vermiculite (seed:vermiculite, 1:5, w/w, 150% water) for 1 day at 27℃ before sowing the germinating seedvermiculite mixture, seedling emergence was faster than occurred in non-treated seeds, but shoot dry weight was increased only in amaranth. Seedling dry weights were greatest at 13 DAP when seeds were subjected to a twostep procedure of priming (3 days at 50% water), followed by germination (1 day at 150% water) in the vermiculite before sowing the germinating seed-vermiculite mixture. This ‘primed-germinated’ treatment increased shoot dry weights by 20, 49, and 84% for radish, kale, and amaranth, respectively, compared to those from non-treated seeds.