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Abstract
The study was conducted to determine the role and suitable dose of Mg fertilizer for rice cultivation in Thua Thien Hue province. A field experiment was arranged in a split - plot with three repetitions, conducted on three new rice varieties (HG12, DT100 and Ha Phat 3) and four doses of Mg (0, 20, 40 and 60 kg MgO/ha) in the winter-spring crop season of 2021-2022 at Huong Long Agricultural and Service Cooperative, Hue city. The research results showed that: 1) Magnesium application increased plant height, number of branches and effective branching ratio, leaf area, chlorophyll content, dry matter, yield and yield components, and CO2 absorption capacity. 2) Applying 40-60 kg MgO/ha has increased yield and economic efficiency, yield of HG12 reached 7.46-7.54 tons/ha and profit increased 2.03-2.24 million VND/ha, DT100 yielded 7.73-7.92 tons/ha and profit increased 2.16-2.86 million VND/ha, Ha Phat 3 yielded 8.36-8.45 tons/ha and increased profit 4.36-4.48 million VND/ha when compared with the control. 3) The amount of CO2 absorbed by HG12 variety was 31.56-32.82 tons CO2/ha/crop season, DT100 variety was 33.81-34.95 tons CO2/ha/crop season and Ha Phat 3 variety was 33.40-35.21 tons of CO2/ha/crop season. The research results are an important basis to supplement the intensive farming process and increase the efficiency of rice cultivation.