ศูนย์นวัตกรรมเทคโนโลยีหลังการเก็บเกี่ยว

Effect of paclobutrazol on growth and flowering of lychee (Litchi chinensis).

Menzel, C. M.; Simpson, D. R.;

Australian Journal of Experimental Agriculture Year: 1990 Vol: 30 Issue: 1 Pages: 131-137 Ref: 27 ref.

1990

บทคัดย่อ

In trials at 4 locations in S. Queensland during 1986-88, L. chinensis cultivars Bengal, Kwai May Pink or Tai So were treated with foliar applications of 1.00-4.00 g paclobutrazol/litre or soil applications of 0.25-1.00 g paclobutrazol/m2 tree ground cover in the autumn after the maturation of the postharvest flush of vegetative growth. Cultivars at these sites varied in the level of vegetative flushing prior to panicle emergence in May-Aug. and flowering in spring. Paclobutrazol reduced flushing and increased flowering in 5 out of 8 orchards, maintained dormancy and reduced flowering in 1 orchard, and had variable effects in 2 orchards, depending on the method of application. Soil applications were generally more effective than foliar sprays at controlling vegetative growth and promoting flowering. The maximum level of flowering in paclobutrazol-treated trees occurred when the control trees flowered moderately (40-60% of terminal branches). The responses were sometimes weak when the trees werevery vigorous vegetatively (<30% flowering). Paclobutrazol had no significant effect or reduced flowering of heavily flowering (70-100% flowering) trees. Paclobutrazol had only a small effect on panicle development, fruit set and fruit quality at most sites. Yield reflected the flowering response to paclobutrazol, except when yields were reduced by excessive male flowering or bird damage to the fruit.