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• CAPACITY TO REDUCE Na⁺ IN SALINE SOIL OF SOYBEAN, SESAME AND SUNFLOWER CULTIVATED UNDER EXPERIMENTAL CONDITION

  Nguyen Anh, Nguyen Tung, Vo Thao, Ngo Thuy Diem Trang

  Date Received: 25-12-2024 / Date Accepted: 11-07-2025 / Date Published: 31-07-2025

   Abstract PDF (VIETNAMESE)

  This study aims to evaluate the ability of soybean (MTĐ 305), sesame (Binh Thuan black sesame cultivar 2), and sunflower (TN 282) in reducing Na⁺ to identify the effective species for application in saline soil reclamation. The plants were cultivated in artificial saline soils with electrical conductivity of the saturated soil paste extract (ECe) values of 1.69 (control soil), 4.10, 7.45, and 8.90 mS/cm, corresponding to the treatments of Đ0, Đ4, Đ6, and Đ8, respectively. After plant cultivation, the soil ECe values were reduced to 3.55-6.80 mS/cm compared to the initial soil ECe values of 4.10-8.90 mS/cm. Na⁺ content in the soil was decreased significantly across all treatments, with a greater reduction observed in the planted treatments. The accumulated Na⁺ in plants biomass were 0.360-0.426 > 0.285-0.421 > 0.208-0.291 g Na⁺/pot for sunflower > soybean > sesame, respectively. Soil salinity stress significantly reduced the yield components of the all three species. The 100-seed weight of soybean was decreased by 11.4-53.5%, and sesame by 12.3-39.7%, while sunflower, the weight of flowers per plant was decreased by 5.5-35.8%. Among the three species, sunflower demonstrated the highest potential for reducing soil Na⁺ and maintained seed yield above 50%, making it is a promising candidate for saline soil reclamation.

  DOI: https://doi.org/10.31817/tckhnnvn.2025.23.7.05

• Freshwater Acclimation and Grow-Out Stages of the Acclimated White-Leg Shrimp (Litopenaeus vannamei) Cultured in Freshwater Ponds during Winter Season in Hung Yen Province

  Kim Van Van, Doan Thi Nhinh

  Date Received: 14-02-2019 / Date Accepted: 15-03-2019 / Date Published: 03-07-2025

   Abstract PDF (VIETNAMESE)

  The trials were conducted to evaluate the survival of white-leg shrimp postlarvae (PL12) acclimatized from 15 ppt salinity to freshwater and to determine the growth performance of the acclimatized shrimp cultured in freshwater ponds during winter season in Hung Yen. Three batches of freshwater acclimatization were carried out, each with four 10.5 m3 circular tanks placed outdoor under roof and from 620,000-690,000 PL (150,000-160,000 PL/tank). The salinity reduction rate of 2 ppt per day was set for all trials. The grow-out trial was performed in three earthen ponds (3,000-3,600 m2) with stocking density of 62-67 PL/m2 and pelleted feed (30% CP) for a 18 week-culture period (126 days). High survival rates of acclimatization were found (above 94%) in all of the three batches. The acclimatized shrimp cultured in freshwater ponds during winter showed good growth rate ( 0.79 ± 0.05 g/week); the shrimp reached the size of 14.28 ± 0.58 g/ind after 18 weeks. The survival rates and FCR values at the end of culture period were 83.3 ± 2.2% and 1.35 ± 0.15, respectively. The economic benefit of the grow-out stage was VND 88.7 million /1000 m2 after 4 winter months of culture. The study indicated that white-leg shrimp can be cultured in freshwater ponds during winter with high survival and growth rate in Northern areas of Vietnam.

  DOI: https://doi.org/10.31817/tckhnnvn.2019.17.1.