The Influence of Liquid Compost of Brown Algae (Sargassum polycystum) Enriched by N, P, K Fertilizer to Chemical Properties of Ultisol Soil and Shallot Production (Allium ascolonicum).

jupita rahmadani (university of sumatera utara)
alida alida (university of sumatera utara)
razali razali (university of sumatera utara)

AGROEKOTEKNOLOGI
Vol 7, No 1,Jan (2019)

The aim of this research was to know the influence of brown algae (Sargassum polycystum) enriched by N, P, K fertilizer to the chemical properties of ultisol soil and Alium cepa L. production. This research was conducted in June-October 2017 using non factorial randomized design with 7 treatments and 4 replications ie P0 (Control), P1 (liquid compost (3x aplications) without enriched), P2 (liquid compost (3x aplications + 2 g urea + 5 g SP36 + 0.5 g KCl), P3 (liquid compost (3x aplications + 1 g urea + 2.5 g SP36 + 0.25 g KCl), P4 (liquid compost ( 6x aplications + 2 g urea + 5 g SP36 + 0.5 g KCl), P6 (liquid compost (6x aplications + 1 g urea + 2.5 g SP36 + 0.25 g KCl) The parameters observed were soil pH, N-total, P-available, K-dd, C-organic, dry weight of shoot, and dry weight of bulb.The results showed that brown algae (Sargassum polycystum) enriched by N, P, K fertilizer can  increasing the pH of soil, P-available, K-dd, C-organic, dry weight of bulb and dry weight of shoot. The best dose was P2 (liquid compost (3x aplications + 2 g urea + 5 g SP36 + 0.5 g of KCl) to P-available, dry weight of shoot and dry weight of tuber.