Abstract
Abstract For the development of ecological sound proof wall, successful seed germination and growth of plants are very important. In our present study, we observed germination of thirty five different seed species in growth chamber at 24℃, humidity 60% and alternation of 12 hours photoperiods. Germination of same seeds were carried out at room temperature on 6:4, 7:3, 8:2, and 9:1 proportion of pure and mineral soils respectively. Out of studied species, maximum germination was recorded for Perennial penant (92%), followed by Brassica napus (86%), and Silene armeria (82%). The measurement of root/shoot length showed, maximum root/shoot length for Perennial penant, followed by perennial sonata and Rebolsentri sp. 
Introduction
Noise is not a new phenomenon. Cities have always been noisy places and roads havealways been a source of noise. Urban populations are becoming more concerned about noise pollution caused by vehicles traffic and are demanding solutions [1] . In this situation, environmental sound barrier is commonly used to mitigate the noise impact produced by the traffic in highways. However, a barrier will finally become part of surrounding landscape and could be a cause of impact for both the road users those who live along the road side [2] . An environmental sound barrier combines the functions of a visual screen and a noise barrier to protect residential, recreational, and other vulnerable areas along the road side. A large body of research work dealing with the modeling and engineering design of noise barriers can be found in technical literature [3, 4] . In addition, many researchers have specifically aimed their work to predict the performance of noise barriers and to develop more efficient barrier designs [5] . Noise barriers can be constructed from earth, concrete, masonry, wood, metal, plastic, and other materials or combination of materials [6] and vegetative wall. Sound Wall is an obvious solution to reduce visual impact because it can be made to fit in with the landscape more naturally than any vertical structure, especially as it can support planting which greatly improves its appearance in most rural contexts. So, the planting wall is likely to be more attractive to both local residents and to road users. The fast growing and deep rooted plants are suitable to make the sound wall. Among all types of sound wall, vegetative wall was found more effective as environmental point of view and economically. Sound barrier wall was starting too built in different area like as residential, school, and city. So, since the last decades scientists have been focusing on vegetative wall [7] . Seed germination represents a risky transition from the stage most tolerant to environmental conditions to the weakest and most vulnerable stage in plant development, the seedling [8] . In addition germination is an irreversible process, and thus wrong timing or location of germination may cause the death of the individual, impacting population recruitment [9] . Different environmental factors may determine seed germination, although the essentials are as an appropriate combination of temperature, moisture and light [10] . After the seed germination and plant growth can be used to make a living wall which acts as an ecological sound 
Material and Method

Seed collection
Thirty five different seeds used for this study were purchase from seed hybrid center. Seeds were chosen to make up ecological sound proof wall which are able to grow naturally in any other condition. Faster growing plants are preferred because it can absorb and provide enough water for the plant growth and hold on the soil.
Growth Chamber Experiment
The germination experiments were performed in growth chamber. In the growth chamber the seeds of thirty five species were exposed on the two layers of moist Whatman No. 1 filter paper in plastic Petri dishes with 9cm diameter. Through out the study the growth chamber was adjusted 24°C temperature, 60% humidity and alteration of photoperiod (12 h light and 12h dark).
Growth Chamber Experiment
Each species were tested in three complementary dishes containing 100 seeds. The moisture level of filter paper was maintained by adding distilled water as required.
Growth Chamber Experiment
Germination was monitored daily from the date of seed sowing. Seed with radical emergence (>2mm) was considered as germination. After two weeks of seed sown all emerging seedlings were counted and measure its root length and shoot length.
Soil Based Experiment
The same seeds were sown in soil at room temperature in the laboratory. Soil composition is very important for the ecological sound proof wall to establish the plant based up on the kinds of soil. We used different proportion of pure soil and mineral soil to make ratio of 6:4, 7:3, 8:2, 9:1. Seedlings were watered every day to enhance the germination and proper growth. The emerging seedlings were grown for four weeks and then harvested to measure their root and shoot length.
Results and Discussion
The germination of different seeds was observed in both growth chamber and room temperature as described in materials and methods. In growth chamber, the seeds were sown over the filter paper and incubated for (Fig. 1) . Germination was also observed in soil under the room temperature as growth chamber. Almost were found good for sound wall .Similarly 9:1 proportion of soil was the best proportion of soil to germinate the seeds and also to develop (Fig.2) . The light condition and humidity were the two major factors responsible for seed germination. Almost all of seeds were germinated in growth chamber with in two weeks except few (Fig. 1) ,
Results and Discussion
It was because that maximum seed were germinated at 2 5℃ and humidity at 60% under the alternation of light. 
Conclusions
The encouraging results in this study showed those ecological sound proof walls are relatively simple to build and offer an effective and ecological alternative to conventional noise barriers used in urban areas. In our study, thirty-five seed species were chosen to test their germination percentage to use for further construction of ecological sound proof walls. Selections were based on rapidly growing species. Germination was examined in two conditions: growth chamber and soil based form in laboratory. In growth chamber, maximum germination was recorded for Perennial penant (92%), followed by
Conclusions
Brassica napus (86%), and Silene armeria (82%). For the establishment of sound wall, root and shoot length are equally important because higher the root length strongly bound to the soil surface and also greatly aids in absorbing water and nutrients required for the plant growth and longevity of species. This study showed that maximum root length was observed for Perennial penant followed by Perennial sonata and Rebolsentri and these species were judged as an appropriate for the construction of ecological sound proof wall.

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