RESEARCH ON THE EFFECTS OF PLANTING DENSITY AND POTASSIUM FERTILIZER DOSAGE ON THE YIELD AND ECONOMIC EFFICIENT OF SHALLOT VARIETY HAN2IN THE SOUTH CENTRAL REGION

Abstract

This study aimed to determine the appropriate planting density and potassium fertilizer dosage for shallot HAN2 variety to achieve high productivity and economic efficiency on coastal sandy soil in the South Central Region. A split-plot design with three replications was applied. The main plot had 3 planting densities (M1: 667 thousand plants/ha, M1: 555 thousand plants/ha and M3: 444 thousand plants/ha), the subplot had 4 potassium fertilizer dosages (K1: 80 kg K₂O/ha, K2: 90 kg K₂O/ha, K3: 100 kg K₂O/ha and K4: 110 kg K₂O/ha). The results showed that the planting density of 555 thousand plants/ha and the potassium fertilizer dosage of 110 kg K₂O/ha were most suitable for shallot HAN2 variety with an average yield of 25.0 - 28.4 tons/ha, the hightest net profit and profit - to - investment ratio (366.636 million VND/ha/crop and 1.16 times in Ninh Thuan province, 312.339 million VND/ha/crop and 1.00 time in Khanh Hoa province and 390.461 million VND/ha/crop and 1.23 times in Quang Ngai province).