PEMANFAATAN LIMBAH Sargassum polycystum DARI INDUSTRI FARMASI SEBAGAI PUPUK CAIR SERTA PENGARUHNYA TERHADAP SIFAT KIMIA TANAH ULTISOL DAN PERTUMBUHAN TANAMAN SAWI

Abstract

The aim of this research to know the effect of seaweed liquid fertilizer ( Sargassum polycystum ) made ​​from waste materials on the growth and production of mustard ( Brassica juncea L.) on ultisol. This research was held in gauze house, Chemistry/Soil Fertility Laboratory and Research Laboratory, Agricultural Faculty, University of North Sumatra, Medan in June-September 2012. The sample of soil to used is ultisol. The research used a Completely Randomized Design (CRD) Non Factorial with nine treatments and three replications that are twenty-seven experimental units. Treatment consists of P 0 (Control), Pa 2 (EM-4 20 cc with liquid seaweed fertilizer every 2 days), Pa 3 (EM-4 20 cc with liquid seaweed fertilizer every 3 days), Pa 4 (EM-4 20 cc with liquid seaweed fertilizer every 4 days), Pa 5 (EM-4 20 cc with liquid seaweed fertilizer every 5 days), Pb 2 (EM-4 40 cc with liquid seaweed fertilizer every 2 days), Pb 3 (EM-4 40 cc with liquid seaweed fertilizer every 3 days), Pb 4 (EM-4 40 cc with liquid seaweed fertilizer every 4 days), Pb 5 (EM-4 40 cc with liquid seaweed fertilizer every 5 days). The result of experiments showed that seaweed liquid fertilizer different is not real to pH of soil, C-organic of soil, N soil, K-exchange, C/N of soil. But, real different to the P-available of soil, fresh weight of plants, fresh weight of root, dry weight of plant and dry weight of root. Keywords: Polycystum sargassum , Seaweed fertilizer, Mustard (Brassica juncea L).