Nghiên cứu ảnh hưởng của phân Ma-giê (Mg) đến một số giống lúa tại Thừa Thiên Huế

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.