STUDY TO DETERMINE FERTILIZER DOSAGE AND CULTIVATION DENSITY SUITABLE FOR THE DT82 RICE VARIETY

Abstract

The research was conducted in the summer-autumn season 2021 and the spring season 2022 on unsilified alluvial soil, to determine the appropriate nitrogen dosage and planting density for the growth, development, productivity and economic efficiency of DT82 rice variety. The experiment was arranged in Split-plot style with 4 nitrogen fertilizer levels: 60; 80; 100; 120 kgN and three planting densities of 35; 40; 45 clusters/m² on fertilizer base of 10 tons of manure, 70 kg of P₂O₅; 80 kg K₂O. The results determined that a nitrogen fertilization level of 100 kgN and a planting density of 40 clusters/m² would help rice variety grow and develop in a balanced manner, minimizing the impact of pests and diseases, especially leaf blight in the spring and summer- autumn season. The highest net yield (reaching 6.88 tons/ha in the spring season and 6.22 tons/ha in the summer- autumn season), the highest profit is 15.03 million VND/ha in the spring season and 10.03 million VND/ha in the summer- autumn season.