Fitriani, F and Pangaribuan, DH and Niswati, A and Yusnaini, S (2020) Improving nitrogen fertilizer efficiency with the addition of compost extracts to kailan (Brassica oleracea L.) plants with 'wick' hydroponic cultivation. Sains Tanah - Journal of Soil Science and Agroclimatology, 17 (2). pp. 122-128. ISSN 2356-1424