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Articles by Jajang Sauman Hamdani
Total Records ( 5 ) for Jajang Sauman Hamdani
  Yayat Rochayat Suradinata and Jajang Sauman Hamdani
  Rose (Rosa hybrida L.) is an ornamental potted flower. Beside its beauty and varieties, its proportional shapes have also become customer’s demand. This problem could be overcome by applying retardant substance in order to control the plants growth. The application of paclobutrazol and 1-Methylcyclopropene was proven to maintain the freshness of the plants (the previous experiment). The experiment was conducted in Rose Nursery Garden, Desa Cihideung, Lembang-West Java (Indonesia), in April-August 2014. The experiment was applying Randomized Group Design (RGD) consisted of seven treatments: (0 ppm+0 mL L-1, 250, 500 ppm, 4, 6, 8 WAG, 0,5 mL L-1). The results showed that the treatment of 500 ppm concentrations of paclobutrazol and 1-applied for 4 weeks after grafting showed the best result on the flower growth, crown display and quality.
  Jajang Sauman Hamdani and Yayat Rochayat Suradinata
  The objective of this research was to study the growth and yield of Atlantic Potato cultivar grown in medium altitude under corn and potato intercropping system and corn row spacing. The experiment was conducted in a research station of Agriculture Faculty of Padjajaran University located in Jatinangor at the altitude of 685 m above sea level with C3 rainfall in Inseptisol soil. It was laid out in Split Plot Design consisting of two factors and four replications. Manipulating growing environment by using corns as shades under different cropping systems was created as the main plot factor which consisted of two cropping systems: 1:1 corn+potato arrangement (one row of corns, one row of potatoes) and 1:2 corn+potato arrangement (one row of corns, two rows of potatoes). The row spacing of corn planted within the rows as the subplots were at 30, 40 and 50 cm. Results of the research indicated that there were no interactions between the corn and potato cropping system and the corn row spacing system over their growth, yields and Land Equivalent Ratio (LER). The plants height of potatoes and their leaf area under 1:1 arrangement were larger compared to those under 1:2 arrangement. On the other hand, the dry mass and the chlorophyll concentrations showed lower value. Although they yield the equal crops, the weight per plot, the yields per hectare and the LER value of 1:1 corns+potatoes cropping system showed higher result. While the row spacing system of corn at 50 cm showed higher value of dry weight, yield per plant, weight per plot and yield per hectare, yet it showed lower value of LER.
  Intan Ratna Dewi Anjarsari , Jajang Sauman Hamdani , Cucu Suherman and Tati Nurmala
  Background and Objectives: The use of growth regulators in pruned tea plantation in Indonesia is still very rare. One method that can be applied to increase growth is through the application of cytokinin such as Benzil amino purine (BAP). The objective of this study was to determine whether the combination of pruning and application of cytokinin BAP can increase the growth of tea. Materials and Methods: This experiment was conducted in Tea and Chinchona Research Centre, Gambung, west Java with an altitude of 1,250 masl. Randomized block design (RBD) was used with pruned height treatment, pruning type and cytokinin dosage combined into 8 treatments. Materials were used 7 year old GMB 7 clone and BAP. All parameters were tested by analysis of variance (ANOVA), followed by Duncan's multiple range test (DMRT) at the 5% significance level. Results: The results showed that type and height of pruning and application of cytokinin BAP affect the growth of pruned tea plants. The combination of clean pruning treatment, a pruning height of 60 cm and cytokinin usage in 60 mL produced optimal results for increased number of buds and active shoot (pecco) in pruned tea plants. Conclusion: The application of BAP can improve plant growth and development. This indicates that the provision of growth regulators has the potential to be used to accelerate the growth of tea plants after being pruned.
  Jajang Sauman Hamdani , Anne Nuraini and Syariful Mubarok
  Background and Objective: One problem in introducing potato cultivation in medium land of Indonesia is high temperature which causes low yield of the potato tuber. High temperature improves shoot growth but reduces the formation and development of tuber. To reduce high temperature and inhibit shoot growth, therefore new strategy must be conducted to resolve this problem such as by the application shading net and paclobutrazol during potato cultivation. The objective of this study was to evaluate the interaction effect between shading net and paclobutrazol on growth and yield of potato ‘medians’ tuber of G2 in medium land of Indonesia. Methodology: Randomized block design was used in this study with two factors, consisted of three levels of shading net density (0, 30 and 40%) and 4 levels of paclobutrazol concentration (0, 50, 100 and 150 mg L–1). All parameters were tested by two-ways of analysis of variance (ANOVA) using Fisher test followed by Duncan’s multiple range test at the 5% significance level. Results: The result showed that no significant interaction between shading net density and paclobutrazol concentration at all observed parameters. Shading net 30% increased plant height, leaf area index, tuber number, tuber weight and percentage of tuber for seed size that was significantly higher than without and 45% shading net. Moreover, paclobutrazol suppressed plant height and leaf area but it increased chlorophyll content, tuber number and tuber weight/plant and percentage of tuber for seed size. Conclusion: Paclobutrazol suppressed plant height and leaf area, however it increased leaves chlorophyll content, tuber number and tuber weight/plant. The highest tuber number and percentage of class tuber for seed size were obtained from plant with 50 mg L–1 of paclobutrazol application.
  Jajang Sauman Hamdani , Kusumiyati and Syariful Mubarok
  Background and Objective: In cultivation of crops at medium plains which have a high temperature, the use of shade not only decreases the light intensity but also decreases the temperature and maintains the soil moisture in order to create suitable conditions for the growth of potatoes. Accordingly, the use of both shade and suitable interval of watering on potatoes cultivated at medium plains is expected to increase the yield. The objective of this study was to determine the effect of shade and water interval on plant growth. Materials and Methods: Experimental design used in this research was split- plot design with including some factors, namely, main-plot factor consisted of 2 levels of shading net (without and with), sub-plot factor consisted of 4 levels of watering interval (1, 2, 3 and 4 days). All parameters were tested by two ways of analysis of variance (ANOVA) by Fisher test followed by Duncan’s Multiple Range Test at the 5% significance level. Results: The results showed that there was efficiency on potato yield cultivated in medium plains by watering with the application shade. In shade treated plants the highest yield is obtained at interval watering every 2 day. In treatment with shade, the highest yield was obtained at watering every 3 days, whereas in without shade plants, the highest yield was obtained at watering every 2 days. Conclusion: It would be concluded that the use of shade on Atlantic cultivars potatoes can increase the efficiency of water use so that watering can be done once every 3 days.
 
 
 
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