Pengaruh Perbandingan Dosis Bokashi dan NPK pada Berbagai Jarak Tanam terhadap Pertumbuhan dan Hasil Bawang Merah TSS di Luar Musim

Shallot (Allium cepa var. aggregatum) is an important horticultural commodity in Indonesia, with demand continuing to increase. However, shallot productivity remains suboptimal. Shallot productivity can be improved through the use of seed-derived planting material, known as True Shallot Seed (TSS), proper fertilizer management, and appropriate plant spacing. This study aimed to determine the effect of different ratios of bokashi and NPK fertilizer doses at various plant spacings on the growth and yield of true shallot seed. The experiment was conducted using a factorial Completely Randomized Design (CRD) consisting of two factors. The first factor was the ratio of bokashi and NPK fertilizer doses: 100% bokashi, 75% bokashi + 25% NPK, 50% bokashi + 50% NPK, 25% bokashi + 75% NPK, and 100% NPK. The second factor was plant spacing: 10 × 15 cm and 10 × 10 cm. The results showed that the application of different bokashi and NPK fertilizer ratios at the tested plant spacings produced similar responses in the growth and yield of shallot. The 75% bokashi + 25% NPK treatment produced better fresh bulb weight per clump, dry bulb weight per clump, dry bulb weight per plot, dry bulb yield per hectare, and bulb diameter compared with the other fertilizer ratios. The 10 × 10 cm plant spacing produced higher dry bulb weight per plot and dry bulb yield per hectare than the 10 × 15 cm plant spacing. The application of 75% bokashi + 25% NPK reduced NPK fertilizer use by 75% without reducing the growth and yield of true shallot seed.