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Nang Nhen rice, a traditional specialty variety of the Bay Nui mountains area of An Giang Province, is being degenerated. The restoration of Nang Nhen rice is carried out in order to retain good quality characteristics as well as productivity of this variety. By applying the SDS-PAGE technique and 2-acetyl-1-pyrroline (2AP) content, the three Nang Nhen lines having good quality characteristics as well as yield have been restored. The selected lines have short duration and good eating qualities, high protein content; low amylose and high yield potential. The aromatic characteristic of these lines was analyzed by using KOH (1.7%) method and the 2-acetyl-1-pyrroline content was analyzed by gas chromatography-mass spectrometry (GC-MS). Three lines NN12-2, NN13-5 and NN13-6 have short growth duration (112-119 days), high protein content (10.6%), and low amylose (14.72%), medium grain rice (6.3 mm), with good tolerance to pest and disease and stable fragrance.

Soybean [Glycine max (L.) Merr.] yield is responsive to changes in plant population and row spacing. The objective of this study was to compare some agronomic traits and yield of soybean varieties cultivated in three different row spaces in a field of Tra On district, Vinh Long province. The experimental design was a split-plot arrangement of treatments in a randomized complete block, with three replications. Main plot factor was inter-row spacing of 30, 40, and 50 cm, and the sub-plot factor was soybean cultivars (MTĐ 176,; the spacing between plants (intra-row spacing) was 15 cm. The results showed significant differences among tested five cultivars of soybeans for all of data collected. The MTĐ 517-8 and MTĐ 878-2 cultivars had the greatest number of branches, number of pods per plant, number of seeds per plant resulted in the highest grain yield of 2.95 tons ha-1 and 2.73 tons ha-1, respectively. While row spacing effects were significant on the plant height, the height of the lowest pod, number of branches, number of seed per pod, and grain yield. Number of branches were greatest in the 50 cm row space. However, the plant height and the grain yield were highest in the 30 cm row space, 45.2 cm và 3.17 tons ha-1, respectively, while grain yield in two remaining row spaces were not differed significantly. Among the tested five soybean varieties, therefore, MTĐ 517-8 or MTĐ 878-2 would give the highest grain yield to soybean farmers in this region and the probability of obtaining maximum yields with narrow row space (30 cm).