INFLUENCE OF PLANT SPACING AND PLANT GROWTh REGULATORS ON GROWTH AND YIELD PERFORMANCE OF TUIBEROSE (Poliunthes tuberosu)

Abstract

An experiment (RCBD) was conducted at the Horticulture Farm of Shere-Bangla Agricultural University, Dhaka during May 2007 to April 2008 to study the effect of spacing (S i : 20 x 15 cm, S 2: 20 x 20 cm and S 3: 20 x 25) and GA 3 (Go: 0 ppm, G1 : 220 ppm. G 2 : 240 ppm and G3: 260 ppm) on growth, bulb and flower yield of tuberose. The widest plant spacing result in the highest bulb yield (9.61 tiha) and flower yield (10.19 tlha) whereas the closest plant spacing produced the lowest. Plant growth regulator (GA3 ) had also significant influence on the yield of tuberose. The higher level of GA 3 (260 ppm GA3) performed the highest bulb (9.81 tlha) and flower (II .60 tJha) production. In respect of combined effect, the widest plant spacing (20 x 25 cm) with the highest level of GA 3 (260 ppm GA 3), produced the highest (9.71t/ha) yield of bulb and flower (10.89 tiha).The lowest was recorded from the treatment combination of S 0G0 . Considering above findings the widest plant spacing (20 x 25 cm) with the highest level GA3 (260 ppm GA3 ) may be used for tuberose cultivation