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Articles by A. Nasrulhaq Boyce
Total Records ( 3 ) for A. Nasrulhaq Boyce
  A. Majrashi , M. Moneruzzaman Khandaker , B. Bakar and A. Nasrulhaq Boyce
  Scirpus grossus L. is a principal rhizomatous weed in the rice fields, drainage and irrigation canals, river banks, abandoned rice fields and wasteland in Malaysia. This study describes the spatio-temporal growth patterns of aerial plant on fertilized and unfertilized paddy soils. The fertilizer application resulted in more robust aerial plant growth of S. grossus with gross population of 97.08 ramets m-2 compared with 83.67 ramets m-2 in unfertilized plots 24 weeks after planting of the mother plant. Mean ramets mortality was significantly higher in unfertilized plots than the fertilized plots. Flowering set in earlier among ramets in fertilized paddy soils with 49.56 ramets m-2 vis-a-vis the unfertilized soil registering ca. 47.79 ramets m-2, 24 weeks after transplanting of the mother plant. The results showed that S. grossus started to flower at weeks 8 under 5 cm and 9th week under 0 cm and highest inflorescence number were recorded at 5 cm water depth. Fertilizer applications did not register any significant difference in mean plant height, chlorophyll content, chlorophyll fluorescence measurements and inflorescence production vis-a-vis those devoid of fertilizer application. However, there was a clear reduction in the chlorophyll content when the plants were grown under 20 cm of water in the presence of fertilizers. The time-and space-mediated clonal growth of S. grossus did not register any significant preferential directionality and dispersion of aerial plants irrespective of fertilizer regimes and water depths but rather displaying opportunistic resource capture by aerial and sub-terranean modules.
  Mohammed Saifuddin , A.B.M.S. Hossain , O. Normaniza , A. Nasrulhaq Boyce and K.M. Moneruzzaman
  In this study, experiments were conducted to investigate the effects of NAA and GA3 on bract longevity under exposed sunlight conditions and six months of observation. Bougainvillea bracts at four different stages of bract development were sprayed with gibberellic acid (100 ppm GA3), naphthaleneacetic acid (50, 100 and 150 ppm NAA) and mixed GA3 (100 ppm) and NAA concentrations (50,100 and 150 ppm). Bract longevity was found to be almost 10 days longer in NAA (50, 100 and 150 ppm) than in the water control and in GA3 (100 ppm) treatment. In the case of GA3 and NAA (50, 100 and 150 ppm) treatment on alternative days, bract longevity was 30 days longer when compared with the water control. It was also observed that a delay in discoloration and stomata conductance were increased in the presence of GA3 with low a concentration of NAA. The results indicated that the prolonging effect of low concentrations of NAA at the initial budding stages was more effective compared with its application at other stages of development and at higher concentrations. Maximum bract weight and shoot length were observed in the GA3 and GA3 plus NAA treated flowers.
  A.B.M. Sharif Hossain , A. Nasrulhaq Boyce and Haji Mohamed
  Experiments were conducted to study the effects of temperature and ethanol application on the development and quality of the elephant apple fruit. Various treatments were carried out, viz., at room temperature (RT, 28°C), in exposed sunlight (ES, 35°C), in 70% ethanol (ET, 28°C), under plastic covering (PC, 28°C), under plastic covering plus 70% ethanol (PCET, 28°C), at low temperatures (LT, 12°C) and at freezing temperature (FT, -1°C). The longest preservation time was observed in fruits preserved in FT (-1°C) and shortest in fruits preserved in ES (35°C) whilst the maturity index was highest in ES (35°C) treatments and lowest in FT (-1°C) compared to the other treatments at the end of the experiments. However, fruits kept at FT (-1°C) exhibited chilling injury symptoms. Total Soluble Solids (TSS) was highest in ES (35°C) and PCET (28°C) from the 1st to the 7th harvest compared to other treatments. A similar increasing trend in TSS was observed in all the treatments. On the contrary, Titratable Acidity (TA) was highest in FT (-1°C) and LT (12°C) from the 1st till the 7th harvest. Similarly a declining trend of TA was found in all the other treatments. TSS was found to be higher in pulp than in peel in the ethanol treatment at 6, 12, 24, 48 and 72 h. However, TA was higher in peel than pulp. The results showed that low temperatures (LT and FT) and plastic covering with 70% ethanol (PCET) delayed ripening in elephant apple fruits and were the best preservation techniques.
 
 
 
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