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Efficiency of inoculation and split application of nitrogen on soybean (Glycine max L.) biomass and yield in coastal sandy soils of Central Vietnam

 


Citation :- Efficiency of inoculation and split application of nitrogen on soybean (Glycine max L.) biomass and yield in coastal sandy soils of Central Vietnam. Res. Crop. 27: 59-64
T. A. T. TRAN, T. S. TRINH AND T. T. H. HOANG htthoa@hueuni.edu.vn
Address : University of Agriculture and Forestry, Hue University, Hue City, Vietnam
Submitted Date : 4-01-2026
Accepted Date : 27-01-2026

Abstract

Soybean is an important crop in cropping systems due to their high nutritional value and role in improving soil fertility through biological nitrogen fixation. However, nitrogen availability remains a major limitation in coastal sandy soils, where efficient use of inoculation and nitrogen fertiliser is critical for crop productivity. Research on the combined effects of seed inoculation and nitrogen fertiliser application timing in soybean is still limited in the coastal sandy soils of Central Vietnam. This study aims to identify the best combination between inoculation and split application of N fertiliser for maximising soybean productivity in Hue city, Vietnam. Field experiments were conducted in two cropping seasons in 2025. Six treatment combinations comprising inoculations (without and with inoculation) and N fertiliser application times (1, 2 and 3) were studied on the DT90 soybean variety. The treatments were arranged in a split plot design with three replications. The results indicated that root and shoot biomass, yield and soil N were significantly affected by the inoculation and N fertiliser split application (p<0.05). The highest shoot biomass (19.5 - 25.1 g/plant), economic yield (2.57 - 3.50 t/ha t/ha) and soil N (31.9 - 32.8 and 14.5 - 15.2 mg/kg) were obtained at treatment of inoculation and 3 times of N fertiliser application. Therefore, this combination could be used as the best practice for soybean production in coastal sandy soil of Hue city, Central Vietnam.

Keywords

Biomass coastal sandy soil rhizobium strain soybean yield

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