EFFECTS OF FERTILIZERS AND CROP DENSITY ON YIELD AND ECONOMIC EFFICIENCY OF HN1 MOSAIC DISEASE RESISTANT CASSAVA VARIETY CULTIVATED ON BASALT SOIL IN DAKLAK PROVINCE

Abstract

This study aimed to determine a suitable fertilizer dose and crop density for HN1 mosaic disease resistant cassava variety cultivated on basalt soil in EaTu commune, Buon Ma Thuot city, Dak Lak province in 2024 - 2025. The results showed that the M4P5 formula with the planting density of 10.000 plants/ha (1.0 m x 1.0 m) and the fertilizer dose of 500 kg NPK 16 - 16 - 8 + 500 kg NPK 10 - 0 - 30 combined with 1.5 tons of Con Co Vang microorganic fertilizer resulted in the highest root weight/root -4.87 kg/root; highest average yield of fresh roots - 48.67 tons/ha/crop, highest starch content of 31.68% and highest yield of starch - 15.39 tons/ha/crop at 95% significance level. This also resulted in the highest net profit of 79 million VND/ha/crop  higher than that of M1P1 which was 50.77 million VND/ha.