Vernalization and benzylamino purine treatments on the generative growth of shallots (allium cepa var. ascalonicum l.) bauji variety in the lowlands

True shallot seeds (Allium cepa var. ascalonicum L.) or True Shallot Seed (TSS) has begun to be used widely as planting material. However, not all types of shallot plants can flower and produce true seeds perfectly because the majority of shallot plants in Indonesia are grown in the lowlands with temperatures of more than 30°C. Although there are some local varieties, which naturally flower, they have not been tested until producing true seeds. This study aims to determine the effect of vernalization and benzyl amino purine (BAP) on the Bauji variety onion plants' generative growth. The research was conducted from July to November 2020 in Jember Regency at an altitude of 89 asl. The research design using a factorial randomized block design. The first factor is vernalization, while the second factor is BAP concentration at 50, 100, and 150 ppm. The results showed an interaction between vernalization factors and the use of BAP, and single-use of BAP did not significantly affect the generative growth of Bauji variety shallot. The vernalization treatment separately actually gave an increasing effect on the percentage of flowering plants, the number of umbels per planting, the number of flowers per umbel, the number of capsules per umbel, the number of seeds per umbel, the TSS weight per umbel, and the weight per 100 seeds.