The purpose of this study was to determine the effect of compost and bioboost doses and their interactions in increasing the yield of leaf onion. This study used a randomized block design (RBD) factorial pattern. The first factor, the compost treatment consisted of 4 levels, namely: without compost, 10 tons ha-1, 20 tons ha-1, and 30 tons ha-1. The second factor, the bioboost fertilizer treatment consisted of 4 levels, namely: without bioboost, 5 cc L-1, 10 cc L-1, and 15 cc L-1, thus there were 16 combination treatments and repeated 3 times so that 48 experimental polybags were needed. The results showed that the compost treatment and the treatment of inter-compost interactions with bioboost had no significant effect on all observed variables. The treatment of bioboost has a very real effect on all observed variables except for the fresh weight of economic results that have a significant effect and the maximum number of leaves has no significant effect. Giving compost at various different dosage levels was not significant, but the compost dose of 30 tons ha-1 yielded the most economical oven dry weight of 1.20 g which increased by 20% compared to yield without compost, namely 1.00 g. The treatment of Bioboost 15 cc L-1 gave the highest oven dry yield of 1.46 g which increased by 80.25% when compared with the lowest value in the treatment without bioboost 0 cc L-1 which was 0.81 g.
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