An experiment was carried out to observe the growth, curd size and yield contributing characters of the modem HYV cauliflower cultivar, ‘Shirajuki’ at Sher-e-Bangla Agricultural University,Dhaka during October 2006 to February 2007.
Plant Materials: Seed of cauliflower cultivar, shirajuki variety was used in the experiment and sown 10 October 2006.
Treatment of the experiment: The experiment was designed to study the effects of different concentration of IAA and GA3 on growth and curd yield of cauliflower. The experiment consisted of two factors were as follows: Factor A: Indole acetic acid (IAA) (Three concentration)
i. I0-IAA (Oppm)
ii.II IAA (5 ppm)
iii. I2 - IAA (10 ppm)
Factor B :Gibbrellic acid (three concentration)
i. Control (G0) - GA3— 0 ppm
ii. (G1)-GA3 —> 80 ppm
iii. (G2) - GA3 —100 ppm
There were altogether 9 treatments combination such as IoGo, IoGi, IoG2, IiGo, IjGj, IiG2, I2Go, I2Gi, I2G2.
Experimental design and layout
The two factors experiment was laid out following Randomized Complete Block Desgin (RCBD) with three replications.
Raising of seedling: Seeds were sown in a wooden tray filled with vermiculite on the 10 October 2006. Nine days old seedlings were transplanted individually in polythene bags filled with equal proportion of sand, soil and cowdung. Seedlings were left under shade for 2 to days and then brought to the sunlight. After three days these seedlings were gradually exposed to sunlight.
Transplanting of seedling and after care: Healthy and uniform sized 30 days aged seedlings were transplanted in the experimental plots on 10 November, 2006 at a spacing of 50 cm x 50 cm.
Preparation and application of GA3 and IAA: Gibberellic acid in different concentrations viz. 80 and 100 ppm IAA in different concentrations viz. 5, 10 ppm were prepared following the procedure mentioned below and spraying was done during noon by using a hand sprayer.
IAA solution : IAA 1 ppm IAA solution was prepared by dissolving 1 mg IAA powder with 10 ml Ethyle Alcohol and the volume was made 1000 ml by adding distilled water in a volumetric flask. So, 5 ppm and 10 ppm IAA solution were prepared in the similar way.
GA3 solution : To prepare 80 ppm and 100 ppm GA3 solution GA3 granules are measured by an electrical balance and dissolved into 1000 ml distilled water.
Statistical analysis: The observations (data) for various growth and yield contributing characters were statistically analyzed to find out the significance of variation from the resulting treatments. The mean for all the calculated and the analysis of variance for each of the characters under study was done by F (variance ratio) test for Randomized Complete Block Design (RCBD). The treatment means were compared by Least Significant Difference (Lsd) at 5% level of significance (Gomez and Gomez, 1984).