Optimasi Dosis Pemupukan Fosfat untuk Produksi 2 Varietas Bawang Merah (Allium ascalonicum L.) di Kecamatan Palipi Kabupaten Samosir

Abstract

Shallots are plants commonly used by the community. In shallot cultivation requires nutrients, one of which is phosphorus. Efforts in increasing shallot production are through optimum fertilization and developing several shallot varieties. In Samosir district, the production of local Samosir shallot varieties has declined and been replaced by Batu Ijo varieties, but until now the optimum dose of phosphate (P) fertilizer for both shallot varieties has not been found. The purpose of this study was to assess the effect of P fertilizer dose levels and varieties on shallot production and obtain the optimum dose of P fertilizer for shallots in Palipi. This research was conducted in Parsaoran Urat Village, Palipi District, Samosir Regency from October to December 2023. This study used Factorial Randomized Group Design (RAK) with 2 factors repeated as many as 3 replications. The first factor is the dose of P fertilizer consisting of 5 treatment levels, namely: 0; 127.78; 255.56; 383.34; and 511.12 kg SP-36/ha. The second factor is shallot varieties, namely Samosir and Batu Ijo varieties. The results showed that several levels of P fertilization did not increase shallot growth and production. Both varieties were able to grow and produce well. But the Batu Ijo variety has the ability to absorb P nutrients better than the Samosir variety. The interaction of P fertilization dose and variety was not able to increase shallot production. In this study, the optimum dose of phosphate fertilizer for shallots was not obtained.