M. MONIRUZZAMAN
Senior Scientific Officer
HRC, Plant Physiology Section, Bangladesh Agricultural Research Institute (BARI), Gazipur
R. KHATOON
Scientific Officer
HRC, Plant Physiology Section, BARI, Gzipur
M. F. B. HOSSAIN
Scientific Officer
HRC, Plant Physiology Section, BARI, Gzipur
M. K. JAMIL
Senior Scientific Officer
Training & Communication Wing, BARI, Gazipur
M. N. ISLAM
Principal Scientific Officer
RARS, BARI, Narsingdi, Bangladesh.
Gibberellic acid (GA3), Napthalene acitic acid (NAA), Leaf photosynthesis, Fruit yield, Brinjal.
Field of Plant Physiology Section of Horticulture Research Centre, Bangladesh Agricultural Research Institute
Crop-Soil-Water Management
The experiment was conducted at the field of Plant Physiology Section of Horticulture Research Centre, Bangladesh Agricultural Research Institute during the rabi season of 2011-12 to 2012-13. The experiment was laid out in split-plot design having seven growth regulator concentrations viz., T1 = control (water spray), T2 = 30 ppm GA3, T3 = 40 ppm GA3, T4 = 50 ppm GA3, T5 = 20 ppm NAA, T6 = 40 ppm NAA, T7 = 60 ppm NAA in main plot and two brinjal varieties viz., V1 = BARI Begun-5 and V2= BARI Begun-10 in subplot with three replications. The unit plot size was 4.8 m2 (2.4 × 2.0 m) consisting of 8 plants with the spacing 100 cm × 60 cm. Forty six days old seedlings were transplanted on 23 November 2011 and 25 November 2012 in consecutive two years, respectively. The hormone was sprayed to the plants at first flowering and other two sprays at 14 days intervals whereas tap water was sprayed in control plot. Cowdung, N, P, and K were applied @ 10 ton, 172 kg, 30 kg, and 124 kg/ha. The source of N, P, and K was urea, TSP, and MoP, respectively. The entire quantity of cowdung, TSP, and half of MoP were applied during final land preparation. The remaining one half of MoP and entire urea were applied in three equal installments at 20, 40, and 60 days after transplanting. The insecticide Comulax (2 g/litre H2O) and Tracer (I ml/2.5 litre H2O) were sprayed at 15 days intervals after transplanting starting from 26 December 2011 and 19 December 2012. Irrigation was given to the plant at 15 days intervals after transplanting. Weeding was done as when necessary. In the first year, duration of fruit harvest in BARI Begun-5 was from 2 March 2012 to 10 April 2012 while in BARI Begun-10, it was from 14 March 2012 to 26 April 2012. In next year, crop of BARI Begun-5, fruit harvest duration was from 28 February 2013 to 7 March 2013 and in BARI Begun-10, the duration was from 11 March 2013 to 22 April 2013. The data were recorded on days to 100% flowering, plant height (cm), stem diameter at harvest (cm), percent of long-styled flower, percent of medium styled flower, leaf photosynthesis, number of fruits/plant, single fruit weight, yield/plant, and yield/plot. Leaf photosynthesis was measured at 10.30 am to 13.30 pm (Bangladesh standard time) with an LCpro + portable infrared CO2 gas analyzer made by ADC Bio-scientific Ltd, Great Amwell, UK. Light intensity was fixed at 1800 PPFD (Photosynthetic Photon flux density). The source of light was an LCpro + conifer chamber red and blue LED lamp attachment. Other conditions were set on ambient mode with diurnal temperature. The changes in fluorescence yield reflect chances in photochemical efficiency and heat dissipation. F0 is the amount of light absorbed initially to raise the fluorescence from a low level to maximum value Fm after dark adaptation of 20 minutes. Fv = Fm-F0, which is the variable. Ratio of Fv/Fm is a dark adapted test used to determine maximum quantum yield (maximum efficiency of Photosystem II). This ratio is also an estimate of the maximum portion of absorbed quanta used in PSII reaction centers (Kitajima and Butler, 1975). The MSTAT-C computer package was used to analyze the data. Mean separation was done by Duncan Multiple Range Test (DMRT).
Bangladesh J. Agril. Res. 39(3): 397-405, September 2014, ISSN 0258-7122
Journal