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Nanomaterials hold great promise of improved plant disease resistance, controlled release of agro-chemicals, enhanced plant growth, etc. In this study, the effect of nanosilica (10 -30 nm) prepared from rice husk on the growth promotion of chili plant in green house was carried out. The experiment of nanosilica treatment by foliar spraying was arranged in a factorial design with 3 replications at various nanosilica concentrations of 0, 40, 60 and 100 ppm. Plant growth characteristics and chlorophyll content were assessed. Results showed that the fresh weight, dry weight, and chlorophyll content increased with the treatment of nanosilica. The optimal concentration of nanosilica was found to be of 60 ppm. Thus, treatment of nanosilica was beneficial in enhancing the growth of the chili plants.

Cho Gao canal is the only inland waterway channel for river transport with large tonnage transporting rice, agricultural products, and goods from the Mekong Delta to Ho Chi Minh City. However, big waves from heavy boat traffic have been gradually wearing away the riverbanks, creating severe erosion and affecting local communities livelihood and safety. This study assessed the vulnerability of riverbank erosion in the Cho Gao canal using a quantified erosion index and the contingent valuation method. The data was collected from 120 households living along the canal. The calculation revealed that 76.67% of the households had moderate erosion vulnerability, which will become higher in the future unless government interventions are made. Besides, this paper also examined people willingness to accept (WTA) to compensate for the losses from riverbank erosion. On average, each household along the canal accepted 503.4 million VND (around 21,872.78 USD) of compensation to pay for their suffered losses. Factors influencing people’s WTA were erosion affected levels, income, and age. People living along the Cho Gao canal have been experiencing damages from riverbank erosion since 2009, so there is a demand for state interventions to alleviate the problem and re-stabilize local communities’ livelihood.

In this paper, the authors present results on dynamic behavior analysis of the stiffened composite plate with piezoelectric patches under airflow by finite element method and experimental study. The first-order shear deformation plate theory and nine-noded isoparametric piezoelectric laminated plate finite element with five elastic degrees of freedom at each node and one electric degree of freedom per element per piezoelectric layer were used in the dynamic analysis of plates by finite element method. The modern equipment was used in the dynamic behaviors analysis of plates subjected to airflow load by experimental method. In this study, the results of the theoretical method have been compared with experimental studies.

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This study sought to estimate the floods and salinity impact index and climate change vulnerability index for the rice farming provinces in Mekong River Delta. In both indexes, Tra Vinh province and the communes within it have the highest index value, followed by other coastal provinces. The estimation showed that the rice production in these areas are being threatened and will be worsen if there is no appropriate plan to cope with the changes in climate condition and extreme events. The results for the simulation model of paddy yield under different scenarios showed decreases in the paddy yield in Mekong River Delta. Specifically, the yield of Spring paddy decreases 6%, Autumn paddy decreases 2%, Winter paddy decreases 4% and Autumn-winter paddy decreases 4% in 2050. From these results, the climate change adaptation and mitigation policies in this delta is suggested to be focused reducing the exposure to sea level rise; upgrading the irrigation system for paddy planting since the coastal provinces have high rate of rain-fed paddy, vulnerability can also be reduced by enhancing the adaptive capacity of provinces through subsidizing and providing farmers with new paddy varieties which are more tolerant to salinity.

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