N. Ara
Horticulture Research Centre, BARI, Joydebpur, Gazipur Bangladesh
M Moniruzzaman
Horticulture Research Centre, BARI, Joydebpur, Gazipur Bangladesh
R. Khatoon
Horticulture Research Centre, BARI, Joydebpur, Gazipur Bangladesh
M. Moniruzzaman
Horticulture Research Centre, BARI, Joydebpur, Gazipur Bangladesh
Yield, Broccoli, Vegetables, Benefit-cost ratio
Horticulture Research Centre, BARI, Joydebpur, Gazipur Bangladesh
Crop-Soil-Water Management
Broccoli, Hormone
The experiment was conducted at the field of plant physiology section of HRC (23.99303 N, 90.41121 E) during the rabi season of 2017-18. The experiment was laid out in Randomized Complete Block Design. The treatments consisted of four GA3 concentrations (Factor-A) viz. G0 = Distilled water (control), G1 = GA3 60 ppm, G2 = GA3 80 ppm and G3 = GA3 100 ppm and two head removal treatments (Factor-B) viz., R0 = no head removal and R1= Head removal at marketable stage. The unit plot size was 2.40 m x 2.50 m (6 m2) having 20 plants. The variety used in the experiment was BARI Broccoli -1. Thirty day-old seedlings were transplanted on 09 November, 2017 adopting a spacing of 60 cm x 50 cm. The PGR GA3 was sprayed to the plants at 50 and 75 days after transplanting mixing with 2-3 drops of Trix solution. Cowdung, urea, TSP, MoP, sulphur, boron, and magnesium were applied @ 10 t, 240, 150, 150, 10, 2 and 2 kg/ha. The entire quantity of cowdung, TSP, sulphur, boron, magnesium, one-third urea and half of MoP were applied during land preparation. The remaining half of MoP and two-third urea was applied in three equal installments at 20, 40 and 60 days after transplanting. An additional dose of 50 kg N/ha, 50 kg K/ha and 10 kg P/ha was applied to the plants at 80 days after transplanting. Weeding was done as when necessary. A total of four irrigation were given to the crop. Head harvest was done at marketable stage from 09 January, 2018 to 23 January, 2018 according to treatments. Seed harvest was done on 12 March, 2018. The data were recorded on plant height, number of leaves/plant, leaf length, leaf breadth, plant spread, CCI (chlorophyll content index) and Fv/Fm value. These data were taken on 01 February 2018. The data was also taken on primary flower stalks/plant, secondary flower stalks/plant, pods/plant, pod length, seeds/pod, 1000 seed weight, weight of seeds/plant and weight of seeds/plot after harvest. The plot yield was converted to per hectare yield. Data on CCI (Chlorophyll Content Index) was taken by Chlorophyll Content Meter (Model:CCM-200, Opti-sciences, USA). CCI is a linear scale. The changes in fluorescence yield reflect changes in photochemical efficiency and heat dissipation. The polyphasic rise of fluorescence transients was measured by an ADC Infrared Gas Analysis plant Efficiency Analyzer (PEA, Handsatech Instruments Ltd., King’s Lynn, UK). The initial fluorescence (F0), maximum fluorescence (Fm) were analyzed and quantum efficiency of open photosystem II centres-quantum yield (Fv/ Fm) was calculated. The leaf discs were previously adapted to the dark for 20 minutes. The fluorescence data were collected every day at 10.00 am to 12.00 pm from initial to end of the experiment. Fo is the amount of light absorbed initially to raise the fluorescence from a low level to maximum value Fm after dark adaptation. Fv = Fm-F0 which is the variable. Ratio of Fv/Fm is a dark adapted test used to determine maximum quantum yield. This ratio is also an estimate of the maximum portion of absorbed quanta used in PSII reaction centers. Recorded data were statistically analyzed by MSTAT-C and mean separation was done by Tukey’s W test at 5% level of probability.
Annual Research Report 2017 – 2018, Horticulture Research Centre, BARI, Joydebpur, Gazipur Bangladesh
Report/Proceedings