Food contamination and food poisoning have been causing serious problems undermining consumer confidence in Vietnam and traceable food is a potential solution to this problem. This study aimed to determine the factors affecting the intention to use traceable fisheries food and the impact level of each factor based on the "Theory of Planned Behavior" (TPB) model on consumers in Ho Chi Minh City. The Structural Equation Modeling (SEM) method was used to analyze the data of 200 participants who were surveyed through face-to-face interviews at organic food stores, supermarkets, shopping centers, and some other locations in Ho Chi Minh City. Research results showed that customer intention for the consumption of traceable fisheries products is formed mainly based on their attitudes while subjective norms showed an indirect effect on intention through attitude. Although the prediction of intention on traceable fisheries consumption behavior was indicated, perceived behavioral control was the key to actual consumption. 

In this study, the extracts of Kaempferia rotunda L. were investigated by GC/MS (Gas chromatography/mass spectrometry). There were 25 compounds in tuberous rhizome: alpha-pinene (4.48%), camphene (20.85%), pentadecane (15.47%), camphor (10.15%), alpha terpinolene (1.01%), bornyl acetate (5.65%), alpha-selinene (2.32%), gamma- urcumene (3.22%), heptadecane (3.80%), alpha-cedrene (3.64%), alpha-amorphene (4.92%), alpha-curcumine (2.68%), benzyl-benzoate (7.56%), eucalyptol (1.01%), and some important other compounds. The protocol for in vitro propagation was conducted. The MS medium supplemented with 2 mg/L of Benzyl adenine and 0.2 mg/L of Kinetin gave the highest number of shoots (4.67 shoots/explant). The MS 1/2 medium supplemented with 0.5 mg/L of Naphthalene acetic acid was suitable for plantlet formation (shoot height: 12.05 cm and 14.56 roots/explant). The greenhouse-acclimated in vitro plants reached a 100% survival rate. 

Calcium, which is one of macrominerals with a high percentage in the human body, plays various physiological roles. As a result, it has become a social concern. In this paper, the role of calcium, its regulation in cells and calcium-rich foods were summarized. In human body, calcium absorption occurs throughout the small intestine via 4 predominant pathways including calbindin-involved pathway, paracellular pathway, transcaltachia and vascular transport. 

Optimizing agricultural land use plans to suit natural conditions, economic development, and environmental protection, especially adaptation to climate change has scientific and practical significance. In this paper, we proposed an optimal crop structure transformation plan according to economic, social and environmental objectives based on using a multi-objective linear planning model and GIS technology. The multi-objective linear planning model supported the determination of the optimal land used structure and GIS technology, assisting the planner in the spatial arrangement of land use. This study was carried out in Ninh Phuoc district, Ninh Thuan province. The results obtained imply high practical significance and could expand the research scale for the whole Ninh Thuan province and other localities with similar conditions.

The agricultural land use in the semi-arid area has been defined as the semi-arid area of 99,089 ha, of which the agricultural land use type is 34,368 ha and the remaining area is forest land, non-agricultural land rivers, streams and unused land. Based on the results of the household survey (450 households), this study was to evaluate the effectiveness of agricultural land use on three factors: economic, social and environmental. Combining the effectiveness of the selected land use types, the land use types of fruit trees, maize-mungbean, and grass had a sustainable development status compared to other types of land use. Based on the assessment of agricultural land use efficiency, the proposal for agricultural land use and solutions to improving the efficiency of agricultural land use in the semi-arid region of Ninh Thuan province was as follows: 2,116 ha of one-crop rice to be converted to maize and mungbean cultivation; 698 ha of one-crop rice to be converted to one-crop rice and one-crop corn; increasing 337 ha for the growing of fruit trees (apples and grapes) and increasing the area of land used to grow grass for livestock.

This study aimed to determine spraying concentrations of the organic foliar solution-Batraixanh Greco 01S for the production of malabar spinach and mustard greens in Spring in Gia Lam,Ha  Noi. Two experiments with malabar spinach and mustard greens were arranged in a randomized complete block design with 5 treatments and 3 replications. In ech experiment, the treatments included 5 different spraying concentrations of the foliar solution (0, 2, 3, 4, 5 mL/L per each spray). The number of sprays for malabar spinach and mustard greens was 4 and 2 times, respectively, and the diluted solution for each spray was 1 L/m2. The results showed that the application of these solutions on malabar spinach and mustard greens significantly increased the growth and yield of these two leafy vegetables (P < 0.05). Malabar spinach sprayed with 3 - 5 mL/L per spray had the highest yield (15.38 - 16.70 tons/ha). The greatest yield of mustard greens was achieved with a spraying concentation of less than 3 mL/L (14.67 tons/ha). Malabar spinach and mustard greens sprayed with 3 mL/L gave the best profit margins of 1.24 and 1.59, respectively.  

The study was conducted to determine the suitable dosages of nitrogen and potassium fertilizer for growth, quality and economic efficiency of Plectranthus hadiensis pot–planted. The experiment was carried out from April to June 2021 in the experiment field of faculty of Agronomy, Nong Lam University, Ho Chi Minh City. A two-factorial experiment was carried out in a completely randomized design (CRD) in three replications. The treatments consisted of 3 doses of nitrogen fertilizer (0.50; 1.00 (control) and 2.00 g N/pot) and 4 doses of potassium fertilizer (0.25; 0.50; 1.00 (control) and 2.00 g K2O/pot) in combinations. The results indicated that plants supplied with 0.50 g N/pot and 1.00 g K2O/pot gave the best results in terms of plant height (16.70 cm), stem diameter (5.45 mm), number of primary branches (10.09 branches/ plant), canopy diameter (20.37 cm), number of leaves (201.04 leaves/plant), leaf length and width (35.06 and 24.13 mm), duration on vase life (40.00 days), commercial pot ratio (94.67%). The revenue was 29,933 thousand VND per 1000 pots with the highest profit margin of 1.33 times at 60 days after planting.

The study was conducted at the Experimental Farm of the Faculty of Agronomy, Nong Lam University, Ho Chi Minh City. The objective of the study was to determine the effects of type and dose of potassium fertilizer on growth and yield of Phan Rang garlic variety. The two-factor experiment was arranged in a randomized complete block design with 8 treatments and 3 replicates. The factor A included 2 types of commercial potassium fertilizers (KCl, K2SO4) and the factor B was 4 different doses of potassium fertilizers (110 kg/ha, 140 kg/ha, 170 kg/ha, 200 kg/ha). The results showed that the application of 200 kg K2SO4/ha increased the plant height (51.8 cm). Bulb diameter (24.7 mm), number of cloves/bulb (12.3 cloves), bulb weight (4.83 g), percentage of dry matter (92%) and bulb yield (1.36 kg/100 pots) were highest in the garlic plants with potassium application at 200 kg/ha.