Effects of tunnel covering plastic films and fertilization methods on growth, bolting, and yield in welsh onion (Allium fistulosum L.) harvested in early summer
2007
Shiraiwa, N.(Tottori-ken. Horticultural Experiment Station, Sakaiminato (Japan). Kyuhin Sand Dune Sub-Station) | Kashima, Y. | Itai, A. | Tanabe, K.
Effects of tunnel covering plastic films and fertilization methods on growth, bolting, and yield were investigated in welsh onion (Allium fistulosum L.) harvested in early summer. Polyolefine plastic film (PO) induced the highest mean air and soil temperatures, while dripped polyethylene plastic film (DP) showed the lowest temperatures. Coefficient of variance on soil water content was higher in PO and non-dripped polyethylene plastic film (NDP). Application of an overall layer of fertilizer produced a lower bolting rate than application of fertilizer in a planting furrow only when using DP, but opposite results were demonstrated with PO and NDP. Effects of covering films and fertilization methods on bolting rate and yield showed significant interaction. Higher thermo-keeping films suppressed flower initiation. When higher thermo-keeping films were used to cover tunnels, management to control nitrogen concentration is required to inhibit bolting in this culture.
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