The main purpose is characterization of Vietnamese wild rice to apply them as valuable genetic resources to improve cultivars. In the past, one of wild rice accessions has been used to breed superior variety AS996 which are cultivated in Vietnam and getting more cultivating areas. This thesis is composed from two parts, 1) Evaluation genetic resources in the Mekong delta, 2) Characterization of superior variety AS996 bred with a particular wild rice in Vietnam. 1

Dendrobium Sonia (D. Sonia) is the cut-flower orchid commonly grown in Ho Chi Minh city. The study aims at to improve the fertilizer management to enhance Dendrobium Sonia obtaining more economic value. In particular, how (i) to determine the effect of P, Ca and boron B on growth and flowering; 

The study was conducted from 2011 to 2016 at Department of Genetics and Plant Breeding - Cuu Long Delta Rice Research Institute and five rice-producing provinces in the Mekong Delta viz. Long An, Hau Giang, Can Tho, An Giang and Tra Vinh. The study aims at (a) determining breeding materials to develop new genotypes adapted to heat tolerance due to climate change; (b) determining elite progenies from backsrossing populations via molecular markers-assisted selection with recurrent parent AS996 and donor N22.

Study on mycotoxin has been conducted for more than 40 recent years as well as animal husbandry industry. The study aims at (1) evaluating the status and critical levels of DON and FUM, which contaminate maize and commercial feed stock for pig farms in southern Vietnam; (2) impacting to dietary with different amount of DON and FUM to perform commercial pigs; (3) assessing the effect absorbent substances using to treat contaminated feed or feedstuffs.

The objectives aim at (1) identifying amino acid components among 25 popular materials for porcine feed-stuff industry in Vietnam; (2) identifying the digestion potential by the amino acids, which include in 25 materials; (3) identifying the industry demand to optimize the feed-stuff. The materials for starch and protein in animal feed-stuff included lower essential amino acids as lysine, threonine, methionine and tryptophan; with low CP of 16% and other essential amino acids exhibited lower than swine demand.

Coffee, black pepper, tea and fruit trees have been grown in the red soils (Rhodic Ferralsols – FRr). The study objectives aim at (1) assessing the organic fertilizer, N and P fertilizer application to soil fertility in case of coffee plantation in Di Linh, Lâm Đồng; (2) analyzing the fertilizer application to robusta coffee (Coffea canephora Pierre); (3) proposing a sustainable development of coffee farm under red soil condition.

To be recognized as an ideal organism, rice (Oryza sativa L.) has attracted considerable attention not only to food security but also to research targets. More importantly, rice plays an indispensable role in human’s lives by providing a staple food for more than half of the world’s population. Over the past decades, there have been dramatic increases in the global population and in the severe impact of climate change threatening food security. Under these strong influences, rice cultivars need to be improved in yield, quality, and in adaptability.

The herbicide glyphosate is an important tool for weed management and it is the most widely applied herbicide worldwide. Concerns have been raised that its increasing use negatively impacts on soil biology. The thesis examined the impact of glyphosate and a commercial formulation (RoundupCT®) on soil functions.  The influence of glyphosate on soil microbial biomass (SMB) and soil microbial respiration (SMR) was unclear, with inconsistent results across published studies.

Jackfruit (Artocarpus heterophyllus Lam.; Moraceae) is currently one of the high value crops in Vietnam with more than 24,000 ha. Trunk canker, a serious disease by Phytophthora palmivora, has been causing significant losses for jackfruit production. The study aims at identifying the causal agent of the jackfruit trunk canker and studying measures for controlling the disease in the Southeastern region

Evaluation of genetic diversity of Vietnamese dogs based on mitochondrial DNA hypervariable-1 region was conducted in Vietnam to aim at identifying the origin of Phu Quoc ridgeback dogs based on mitochondrial DNA Hypervariable-1 region. The reference genome included 5567 sequences in GenBank to facilitate the identification of Canis mitochrondria HV1 DNA haplotype. The result indicated that a successful protocol  could help DNA extract form dog hair.