The results of research to determinate the suitable planting density for Viet Thanh 213 rice variety in Thanh Hoa province

Abstract

Research to determine the appropriate planting density for Viet Thanh 213 rice variety in Thanh Hoa province. The experiment was implemented in the spring and Summer - Autumn crop of 2022 in Hoang Hoa district and Thieu Hoa district, Thanh Hoa province. The experiment was arranged in a completely randomized block, with 3 replications including 4 formula and corresponding to 4 planting densities of 30, 40, 50, 60 plants/m2 (Spring crop). 35, 40, 45, 50 plants/m² (Summer - Autumn crop). Research results show that Viet Thanh 213 rice variety has an average growth time of 123.0 - 131.0 days in the Spring crop, 105.0 - 107.0 days in the Summer - Autumn crop and an average plant height. Reaching 120.2 - 124.0 cm (Spring crop) and reaching 112.6 - 114.9 cm (Summer - Autumn crop). Planting rice at density of 30 plants/m² (Spring crop) and 35 plants/m² (Summer - Autumn crop) has the highest growth and yield indicators but population productivity is low so the actual yield is low. The lowest is 59.7 quintals/ha (Spring crop) and 50.3 quintals/ha (Summer - Autumn crop). At a planting density of 50 plants/m² (Spring crop), rice plants grow smoothly, with an average growth time of 127.0 days, an average plant height of 121.4 cm and the number of rice plants reaching 8.3 plants, the number of effective rice plants reached 5.8, the leaf freshness score was at point 5 and plant hardness was at point 1, the variety had a net yield of 68.7 quintals/ha. In Hoang Hoa district, it reached 67.8 quintals/ha with a net profit of 21.62 million VND/ha and in Thieu Hoa district it reached 69.7 quintals/ha with a net profit of 23.05 million VND/ha. In the Summer - Autumn crop at a density of 45 plants/m², the total growth time of rice plants is 106 days, the average height is 113.3 cm, the number of plants is 8.2 plants, the number of effective plants is 5.2 plants. The actual yield reached 60.8 quintals/ha, of which at Hoang Hoa point it reached 59.9 quintals/ha with a net profit of 15.76 million VND/ha and at Thieu Hoa it reached 61.6 quintals/ha with a net profit of 15.76 million VND/ha