Abstract. An investigation on the current usage status and experience in using Peristrophe bivalvis (L.) Merr. was conducted in the mountainous region of Northern Vietnam. Five varieties were collected and recorded as a source of foodstuff-dyeing and medicinal plants on indigenous knowledge of ethnic minorities in the study area, of which, three varieties were dyed purple, one red and one yellow-orange; with two varieties being used for the treatment of haemoptysis, dysentery, liver disease, kidney failure, and jaundice. Two extraction methods using organic solvents and aqueous solvent were applied to spectrophotometrically investigate the phytochemical contents of Peristrophe bivalvis varieties. Accordingly, the coloration components of Peristrophe bivalvis varieties were contributed by a complex compound of photosynthetic pigments, anthocyanins, flavonoids. Also, the total phenolics, total flavonoids and effect of extraction methods, dissolved solutions (water and methanol) on these contents were assessed. Besides, screening antioxidant capacity of Peristrophe bivalvis varieties was assayed by 1,1-diphenyl-2-picrylhydrazyl (DPPH) method which showed stronger radical inhibition of organic extractions than that of aqueous extractions. The results of determination of phytochemicals and antioxidant capacity support the knowledge and experience in using Peristrophe bivalvis varieties as natural dyeing production for food and pharmaceutical industry.
Aims: This study was carry out to evaluate the effects of pesticide on vegetative growth, fruit yield, fruit quality of sweet seedless Mandarin citrus seedless in basic design period at Thai Nguyen province
Study Design: The study was carried out in Dai Tu district, Thai Nguyen province in 2017-2018. The experiment included three treatments were designed in Randomized Complete Block Design with three replications.
Results and Discussion: The vegetative growth of tree and shoot, fruit character and fruit quality was collected. Results indicated that T2 treatment (Trebon 10 EC) had the best results in vegetative growth, fruit quality and fruit yield.
Conclusion: It was concluded that T2 treatment application has greatly enhanced vegetative growth, fruit character, and fruit quality of sweet seedless Mandarin under field conditions.
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