BIOASSAY OF ZnO-SnO2 NANO COMPOSITE ON BLACK GRAM (Vigna mungo)

Present experimentation was done to study the effect of ZnO-SnO2 composite on different morphological parameters of Black gram. In this work, we have synthesized ZnO-SnO2 nanocomposite by Chemical co-precipitation method and characterized it using X-ray diffraction spectrograph, UV-visible absorption spectroscopy, scanning electron microscope and Transmission electron microscope. The particle size of synthesized nanocomposite material lies between 25.75 nm to 39.16 nm. The synthesized nanocomposite exhibited needle shaped morphology and showed maximum absorbance at 355 nm of wavelength. For studying the effect of synthesized nanocomposite material on morphological parameters of Black gram, healthy and presoaked seeds of Black gram were treated with three different concentration of ZnO-SnO2 composite (i.e. 20, 40, and 60%). Control was also maintained for each set. Black gram belongs to family Fabaceae and is commonly used as a food for protein and other nutritive substances. Black gram is also used as green manure for agricultural practices. During the field observation a significant effects have been observed on various morphological parameters. A reduction in germination and survival percentages were also observed in treated sets.

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CAN Camellia japonica GROW IN VIETNAM? SEED GERMINATION AND INITIAL GROWTH

Camellia japonica L. is an evergreen tree, belonging to family Theaceae. The species naturally distributes in China, Taiwan, Korea, and southern Japan. It has been widely planted for ornamenting purpose. Also, C. japonica oil has been extracted and used for healthcare. In this study, seed germination and initial seedling growth of C. japonica were experimented in Hanoi, Vietnam.Seeds were collected in January in Kyoto, Japan and transported to Vietnam. Seeds were stored in normal room conditions until the experiment in February. Pre-sowing treatment was conducted by soaking in 50-55oC ordinary water until reaching normal temperature. Treated seeds were then sown in wet sandy bed for germination. Germinated seeds were then transplanted to forested-soil pots and tended normally by watering twice a day without fertilization and pest/disease control. The results indicated that the first seed germinated was recorded 3 weeks after experimenting, and germination ended in 2 weeks from the first germination. Most seeds germinated in the duration of 5th day to 10th day after the first germination. The germination rate was 62.5% and seedling survival rate was 96.8% at 4 months of growth. Seedlings of 4 months old had an average height of 15.9 cm, diameter at the stump of 2.1 mm, the taproot of 11.4 cm long, and average 10.6 leaves/seedling. It is possible to grow C. japonica in Vietnam. However, further study should be conducted in the field conditions.

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