The effect of inorganic fertilizer combination in the growth and yield of Palasa Shallot (Allium ascalonicum L.) local variety of Central Sulawesi

Abstract The research aim to identify the optimal combination of inorganic fertilizer to enhance the growth and yield of Palasa local shallots ( Allium ascalonicum L.). it was conducted from April to November 2023 in Kotarindau Village, Dolo District, Sigi Regency, Central Sulawesi. The implementation method used a Randomized Block Design with four inorganic fertilizer combination treatments and three replications. Fertilizer combination P0 (farmer’s fertilizer combination). P1 (basic fertilizer NPK 350 kg/ha + SP36 100 kg/ha + 1 t/ha dolomite lime. Follow-up I at 3 WAP NPK Mutiara 250 kg/ha. Follow-up II at 5 WAP ZA 200 kg/ha + KCl 100 kg/ha. P2 (basic fertilizer NPK 400 kg/ha + SP36 75 kg/ha + dolomite lime based on soil pH. Follow-up I at 3 WAP NPK Mutiara 200 kg/ha. Follow-up II at 5 WAP ZA 150 kg/ha + KCl 50 kg/ha. P3 (basic fertilizer NPK 450 kg/ha + SP36 50 kg/ha + dolomite lime 1.5 t/ha. Follow-up I at 3 WAP NPK Mutiara 150 kg/ha. Follow-up II at 5 WAP ZA 100 kg/ha + KCl 50 kg/ha. Observations consist of components of plant growth and yield. Data analysis used Anova and the 5% DMRT test. The results indicated that the combination of fertilizers had a significant effect on the growth and yield of Palasa shallots. Treatment P2 obtained the highest results compared to the other three fertilizer combinations, which was 14.64 t/ha. A combination of P2 fertilizers gave shallot yields in 24.17% higher compared to the farmer’s fertilizer combination (P0). However, the increasing dose reduces yields by 13.57% (P3).